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1. Superfluid-tight cryogenic receiver with continuous sub-Kelvin cooling for EXCLAIM

Author: Dahal, Sumit, Ade, Peter A. R., Anderson, Christopher J., Barlis, Alyssa, Barrentine, Emily M., Beeman, Jeffrey W., Bellis, Nicholas, Bolatto, Alberto D., Braianova, Victoria, Breysse, Patrick C., Bulcha, Berhanu T., Cataldo, Giuseppe, Colazo, Felipe A., Chevres-Fernandez, Lee-Roger, Cho, Chullhee, Chmaytelli, Danny S., Connors, Jake A., Costen, Nicholas P., Cursey, Paul W., Ehsan, Negar, Essinger-Hileman, Thomas M., Glenn, Jason, Golec, Joseph E., Hays-Wehle, James P., Hess, Larry A., Jahromi, Amir E., Jenkins, Trevian, Kimball, Mark O., Kogut, Alan J., Kramer, Samuel H., Leung, Nicole, Lowe, Luke N., Mauskopf, Philip D., McMahon, Jeffrey J., Mikula, Vilem, Mirzaei, Mona, Moseley, Samuel H., Mugge-Durum, Jonas W., Nellis, Jacob, Noroozian, Omid, Okun, Kate, Oxholm, Trevor, Parekh, Tatsat, Pen, Ue-Li, Pullen, Anthony R., Rahmani, Maryam, Ramirez, Mathias M., Roberson, Cody, Rodriguez, Samelys, Roselli, Florian, Sapkota, Deepak, Shire, Konrad, Siebert, Gage L., Siddique, Faizah, Sinclair, Adrian K., Somerville, Rachel S., Stephenson, Ryan, Stevenson, Thomas R., Switzer, Eric R., Termini, Jared, Timbie, Peter T., Trenkamp, Justin, Tucker, Carole E., Visbal, Elijah, Volpert, Carolyn G., Watson, Joseph, Weeks, Eric, Wollack, Edward J., Yang, Shengqi, and Yung, Aaron
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a balloon-borne telescope designed to survey star formation over cosmological time scales using intensity mapping in the 420 - 540 GHz frequency range. EXCLAIM uses a fully cryogenic telescope coupled to six on-chip spectrometers featuring kinetic inductance detectors (KIDs) to achieve high sensitivity, allowing for fast integration in dark atmospheric windows. The telescope receiver is cooled to $\approx$ 1.7 K by immersion in a superfluid helium bath and enclosed in a superfluid-tight shell with a meta-material anti-reflection coated silicon window. In addition to the optics and the spectrometer package, the receiver contains the magnetic shielding, the cryogenic segment of the spectrometer readout, and the sub-Kelvin cooling system. A three-stage continuous adiabatic demagnetization refrigerator (CADR) keeps the detectors at 100 mK while a $^4$He sorption cooler provides a 900 mK thermal intercept for mechanical suspensions and coaxial cables. We present the design of the EXCLAIM receiver and report on the flight-like testing of major receiver components, including the superfluid-tight receiver window and the sub-Kelvin coolers., Comment: 13 pages, 7 figures, 1 table
Published: 2024
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2. Optimization of an Optical Testbed for Characterization of EXCLAIM µ-Spec Integrated Spectrometers

Author: Rahmani, Maryam, Barrentine, Emily M., Switzer, Eric R., Barlis, Alyssa, Brown, Ari D., Cataldo, Giuseppe, Connors, Jake A., Ehsan, Negar, Essinger-Hileman, Thomas M., Grant, Henry, Hays-Wehle, James, Hsieh, Wen-Ting, Mikula, Vilem, Moseley, S. Harvey, Noroozian, Omid, Quijada, Manuel A., Patel, Jessica, Stevenson, Thomas R., Tucker, Carole, U-Yen, Kongpop, Volpert, Carolyn G., and Wollack, Edward J.
Published: 2024
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3. Optimization of an Optical Testbed for Characterization of EXCLAIM u-Spec Integrated Spectrometers

Author: Rahmani, Maryam, Barrentine, Emily M., Switzer, Eric R., Barlis, Alyssa, Brown, Ari D., Cataldo, Giuseppe, Connors, Jake A., Ehsan, Negar, Essinger-Hileman, Thomas M., Grant, Henry, Hays-Wehle, James, Hsieh, Wen-Ting, Mikula, Vilem, Moseley, S. Harvey, Noroozian, Omid, Quijada, Manuel A., Patel, Jessica, Stevenson, Thomas R., Tucker, Carole, U-Yen, Kongpop, Volpert, Carolyn G., and Wollack, Edward J.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We describe a testbed to characterize the optical response of compact superconducting on-chip spectrometers in development for the Experiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) mission. EXCLAIM is a balloonborne far-infrared experiment to probe the CO and CII emission lines in galaxies from redshift 3.5 to the present. The spectrometer, called u-Spec, comprises a diffraction grating on a silicon chip coupled to kinetic inductance detectors (KIDs) read out via a single microwave feedline. We use a prototype spectrometer for EXCLAIM to demonstrate our ability to characterize the spectrometers spectral response using a photomixer source. We utilize an on-chip reference detector to normalize relative to spectral structure from the off-chip optics and a silicon etalon to calibrate the absolute frequency.
Published: 2023

4. Optical Characterization & Testbed Development for {\mu}-Spec Integrated Spectrometers

Author: Rahmani, Maryam, Barlis, Alyssa, Barrentine, Emily M., Brown, Ari D., Bulcha, Berhanu T., Cataldo, Giuseppe, Connors, Jake, Ehsan, Negar, Essinger-Hileman, Thomas M., Grant, Henry, Hays-Wehle, James, Hsieh, Wen-Ting, Mikula, Vilem, Moseley, S. Harvey, Noroozian, Omid, Oxholm, Trevor R., Quijada, Manuel A., Patel, Jessica, Stevenson, Thomas R., Switzer, Eric R., Tucker, Carole, U-Yen, Kongpop, Volpert, Carolyn, and Wollack, Edward J.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: This paper describes a cryogenic optical testbed developed to characterize u-Spec spectrometers in a dedicated dilution refrigerator (DR) system. u-Spec is a far-infrared integrated spectrometer that is an analog to a Rowland-type grating spectrometer. It employs a single-crystal silicon substrate with niobium microstrip lines and aluminum kinetic inductance detectors (KIDs). Current designs with a resolution of 512 are in fabrication for the EXCLAIM (Experiment for Cryogenic Large Aperture Intensity Mapping) balloon mission. The primary spectrometer performance and design parameters are efficiency, NEP, inter-channel isolation, spectral resolution, and frequency response for each channel. Here we present the development and design of an optical characterization facility and preliminary validation of that facility with earlier prototype R=64 devices. We have conducted and describe initial optical measurements of R = 64 devices using a swept photomixer line source. We also discuss the test plan for optical characterization of the EXCLAIM R = 512 u-Spec devices in this new testbed., Comment: SPIE conference, Montreal, Ca. July 17-22, 2022
Published: 2022

5. Developing a New Generation of Integrated Micro-Spec Far Infrared Spectrometers for the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM)

Author: Volpert, Carolyn G., Barrentine, Emily M., Mirzaei, Mona, Barlis, Alyssa, Bolatto, Alberto D., Bulcha, Berhanu, Cataldo, Giuseppe, Connors, Jake A., Costen, Nicholas, Ehsan, Negar, Essinger-Hileman, Thomas, Glenn, Jason, Hays-Wehle, James P., Hess, Larry A., Kogut, Alan J., Moseley, Harvey, Mugge-Durum, Jonas, Noroozian, Omid, Oxholm, Trevor M., Rahmani, Maryam, Stevenson, Thomas, Switzer, Eric R., Watson, Joseph, and Wollack, Edward J.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Astrophysics of Galaxies, Physics - Instrumentation and Detectors
Abstract: The current state of far-infrared astronomy drives the need to develop compact, sensitive spectrometers for future space and ground-based instruments. Here we present details of the $\rm \mu$-Spec spectrometers currently in development for the far-infrared balloon mission EXCLAIM. The spectrometers are designed to cover the $\rm 555 - 714\ \mu$m range with a resolution of $\rm R\ =\ \lambda / \Delta\lambda\ =\ 512$ at the $\rm 638\ \mu$m band center. The spectrometer design incorporates a Rowland grating spectrometer implemented in a parallel plate waveguide on a low-loss single-crystal Si chip, employing Nb microstrip planar transmission lines and thin-film Al kinetic inductance detectors (KIDs). The EXCLAIM $\rm \mu$-Spec design is an advancement upon a successful $\rm R = 64\ \mu$-Spec prototype, and can be considered a sub-mm superconducting photonic integrated circuit (PIC) that combines spectral dispersion and detection. The design operates in a single $M{=}2$ grating order, allowing one spectrometer to cover the full EXCLAIM band without requiring a multi-order focal plane. The EXCLAIM instrument will fly six spectrometers, which are fabricated on a single 150 mm diameter Si wafer. Fabrication involves a flip-wafer-bonding process with patterning of the superconducting layers on both sides of the Si dielectric. The spectrometers are designed to operate at 100 mK, and will include 355 Al KID detectors targeting a goal of NEP ${\sim}8\times10^{-19}$ $\rm W/\sqrt{Hz}$. We summarize the design, fabrication, and ongoing development of these $\rm \mu$-Spec spectrometers for EXCLAIM., Comment: 9 pages, 5 figures, to appear in the Proceedings of the SPIE Astronomical Telescopes + Instrumentation (2022)
Published: 2022

6. Operational Optimization to Maximize Dynamic Range in EXCLAIM Microwave Kinetic Inductance Detectors

Author: Oxholm, Trevor M., Switzer, Eric R., Barrentine, Emily M., Essinger-Hileman, Thomas, Hays-Wehle, James P., Mauskopf, Philip D., Noroozian, Omid, Rahmani, Maryam, Sinclair, Adrian K., Stephenson, Ryan, Stevenson, Thomas R., Timbie, Peter T., Volpert, Carolyn, and Weeks, Eric
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: Microwave Kinetic Inductance Detectors (MKIDs) are highly scalable detectors that have demonstrated nearly background-limited sensitivity in the far-infrared from high-altitude balloon-borne telescopes and space-like laboratory environments. In addition, the detectors have a rich design space with many optimizable parameters, allowing highly sensitive measurements over a wide dynamic range. For these reasons, MKIDs were chosen for the Experiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM), a balloon-borne telescope targeting nearly background-limited performance in a high-altitude atmospheric environment from 420-540 GHz. We describe MKID optimization in the specific context of EXCLAIM and provide general results that apply to broader applications. Extending the established approach of tone frequency tracking, we show that readout power optimization enables significant, further improvement in dynamic range.
Published: 2022
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7. Overview and status of EXCLAIM, the experiment for cryogenic large-aperture intensity mapping

Author: Cataldo, Giuseppe, Ade, Peter, Anderson, Christopher, Barlis, Alyssa, Barrentine, Emily, Bellis, Nicholas, Bolatto, Alberto, Breysse, Patrick, Bulcha, Berhanu, Connors, Jake, Cursey, Paul, Ehsan, Negar, Essinger-Hileman, Thomas, Glenn, Jason, Golec, Joseph, Hays-Wehle, James, Hess, Larry, Jahromi, Amir, Kimball, Mark, Kogut, Alan, Lowe, Luke, Mauskopf, Philip, McMahon, Jeffrey, Mirzaei, Mona, Moseley, Harvey, Mugge-Durum, Jonas, Noroozian, Omid, Oxholm, Trevor, Pen, Ue-Li, Pullen, Anthony, Rodriguez, Samelys, Shirron, Peter, Siebert, Gage, Sinclair, Adrian, Somerville, Rachel, Stephenson, Ryan, Stevenson, Thomas, Switzer, Eric, Timbie, Peter, Tucker, Carole, Visbal, Eli, Volpert, Carolyn, Wollack, Edward, and Yang, Shengqi
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a balloon-borne far-infrared telescope that will survey star formation history over cosmological time scales to improve our understanding of why the star formation rate declined at redshift z < 2, despite continued clustering of dark matter. Specifically,EXCLAIM will map the emission of redshifted carbon monoxide and singly-ionized carbon lines in windows over a redshift range 0 < z < 3.5, following an innovative approach known as intensity mapping. Intensity mapping measures the statistics of brightness fluctuations of cumulative line emissions instead of detecting individual galaxies, thus enabling a blind, complete census of the emitting gas. To detect this emission unambiguously, EXCLAIM will cross-correlate with a spectroscopic galaxy catalog. The EXCLAIM mission uses a cryogenic design to cool the telescope optics to approximately 1.7 K. The telescope features a 90-cm primary mirror to probe spatial scales on the sky from the linear regime up to shot noise-dominated scales. The telescope optical elements couple to six {\mu}-Spec spectrometer modules, operating over a 420-540 GHz frequency band with a spectral resolution of 512 and featuring microwave kinetic inductance detectors. A Radio Frequency System-on-Chip (RFSoC) reads out the detectors in the baseline design. The cryogenic telescope and the sensitive detectors allow EXCLAIM to reach high sensitivity in spectral windows of low emission in the upper atmosphere. Here, an overview of the mission design and development status since the start of the EXCLAIM project in early 2019 is presented., Comment: SPIE Astronomical Telescopes + Instrumentation. arXiv admin note: substantial text overlap with arXiv:1912.07118
Published: 2021
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8. SOFIA - HIRMES: Looking forward to the HIgh-Resolution Mid-infrarEd Spectrometer

Author: Richards, Samuel N., Moseley, Samuel H., Stacey, Gordon, Greenhouse, Matthew, Kutyrev, Alexander, Arendt, Richard, Atanasoff, Hristo, Banks, Stuart, Brekosky, Regis P., Brown, Ari-David, Bulcha, Berhanu, Cazeau, Tony, Choi, Michael, Colazo, Felipe, Engler, Chuck, Hadjimichael, Theodore, Hays-Wehle, James, Henderson, Chuck, Hsieh, Wen-Ting, Huang, Jeffrey, Jenstrom, Iver, Kellogg, Jim, Kimball, Mark, Kovacs, Attila, Leiter, Steve, Maher, Steve, McMurray, Robert, Melnick, Gary J., Mentzell, Eric, Mikula, Vilem, Miller, Timothy M., Nagler, Peter, Nikola, Thomas, Oxborrow, Joseph, Pontoppidan, Klaus M., Rangwala, Naseem, Rhodes, Alan, Roberge, Aki, Rosner, Stefan, Rostem, Karwan, Rustemeyer, Nancy, Sharp, Elmer, Sparr, Leroy, Stevanovic, Dejan, Taraschi, Peter, Temi, Pasquale, Vacca, William D., de Lorenzo, Jordi Vila Hernandez, Wohler, Bill, Wollack, Edward J., and Wilks, Shannon
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The HIgh-Resolution Mid-infrarEd Spectrometer (HIRMES) is the 3rd Generation Instrument for the Stratospheric Observatory For Infrared Astronomy (SOFIA), currently in development at the NASA Goddard Space Flight Center (GSFC), and due for commissioning in 2019. By combining direct-detection Transition Edge Sensor (TES) bolometer arrays, grating-dispersive spectroscopy, and a host of Fabry-Perot tunable filters, HIRMES will provide the ability for High Resolution (R~100,000), Mid-Resolution (R~10,000), and Low-Resolution (R~600) slit-spectroscopy, and 2D Spectral Imaging (R~2000 at selected wavelengths) over the 25 - 122 {\mu}m mid-far infrared waveband. The driving science application is the evolution of proto-planetary systems via measurements of water-vapor, water-ice, deuterated hydrogen (HD), and neutral oxygen lines. However, HIRMES has been designed to be as flexible as possible to cover a wide range of science cases that fall within its phase-space, all whilst reaching sensitivities and observing powers not yet seen thus far on SOFIA, providing unique observing capabilities which will remain unmatched for decades., Comment: Accepted to the Journal of Astronomical Instrumentation (SOFIA Special Edition) on 11th November 2018
Published: 2018

9. Microstructure analysis of bismuth absorbers for transition-edge sensor X-ray microcalorimeters

Author: Yan, Daikang, Divan, Ralu, Gades, Lisa M., Kenesei, Peter, Madden, Timothy J., Miceli, Antonino, Park, Jun-Sang, Patel, Umeshkumar M., Quaranta, Orlando, Sharma, Hemant, Bennett, Douglas A., Doriese, William B., Fowler, Joseph W., Gard, Johnathon, Hays-Wehle, James, Morgan, Kelsey M., Schmidt, Daniel R., Swetz, Daniel S., and Ullom, Joel N.
Subjects: Physics - Instrumentation and Detectors
Abstract: Transition-edge sensors (TESs) as microcalorimeters offer high resolving power, owning to their sharp response and low operating temperature. In the hard X-ray regime and above, the demand for high quantum-efficiency requires the use of absorbers. Bismuth (Bi), owing to its low heat carrier density and high X-ray stopping power, has been widely used as an absorber material for TESs. However, distinct spectral responses have been observed for Bi absorbers deposited via evaporation versus electroplating. Evaporated Bi absorbers are widely observed to have a non-Gaussian tail on the low energy side of measured spectra. In this study, we fabricated Bi absorbers via these two methods, and performed microstructure analysis using scanning electron microscopy (SEM) and X-ray diffraction microscopy. The two types of material showed the same crystallographic structure, but the grain size of the evaporated Bi was about 40 times smaller than that of the electroplated Bi. This distinction in grain size is likely to be the cause of their different spectral responses.
Published: 2017
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10. Eliminating the non-Gaussian spectral response of X-ray absorbers for transition-edge sensors

Author: Yan, Daikang, Divan, Ralu, Gades, Lisa M., Kenesei, Peter, Madden, Timothy J., Miceli, Antonino, Park, Jun-Sang, Patel, Umeshkumar M., Quaranta, Orlando, Sharma, Hemant, Bennett, Douglas A., Doriese, William B., Fowler, Joseph W., Gard, Johnathon, Hays-Wehle, James, Morgan, Kelsey M., Schmidt, Daniel R., Swetz, Daniel S., and Ullom, Joel N.
Subjects: Physics - Instrumentation and Detectors
Abstract: Transition-edge sensors (TES) as microcalorimeters for high-energy-resolution X-ray spectroscopy are often fabricated with an absorber made of materials with high Z (for X-ray stopping power) and low heat capacity (for high resolving power). Bismuth represents one of the most compelling options. TESs with evaporated bismuth absorbers have shown spectra with undesirable and unexplained low-energy tails. We have developed TESs with electroplated bismuth absorbers over a gold layer that are not afflicted by this problem and that retain the other positive aspects of this material. To better understand these phenomena, we have studied a series of TESs with gold, gold/evaporated bismuth, and gold/electroplated bismuth absorbers, fabricated on the same die with identical thermal coupling. We show that bismuth morphology is linked to the spectral response of X-ray TES microcalorimeters.
Published: 2017
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11. Superfluid-tight cryogenic receiver with continuous sub-kelvin cooling for EXCLAIM

Author: Zmuidzinas, Jonas, Gao, Jian-Rong, Dahal, Sumit, Ade, Peter A. R., Anderson, Christopher J., Barlis, Alyssa, Barrentine, Emily M., Beeman, Jeffrey W., Bellis, Nicholas G., Bolatto, Alberto D., Braianova, Victoria, Breysse, Patrick C., Bulcha, Berhanu T., Cataldo, Giuseppe, Colazo, Felipe A., Chevres-Fernandez, Lee-Roger, Cho, Chullhee, Chmaytelli, Danny S., Connors, Jake A., Costen, Nicholas P., Cursey, Paul W., Ehsan, Negar, Essinger-Hileman, Thomas M., Glenn, Jason, Golec, Joseph E., Hays-Wehle, James P., Hess, Larry A., Jahromi, Amir E., Jenkins, Trevian, Kimball, Mark O., Kogut, Alan J., Kramer, Samuel H., Leung, Nicole, Lowe, Luke N., Mauskopf, Philip D., McMahon, Jeffrey J., Mikula, Vilem, Mirzaei, Mona, Moseley, Samuel H., Mugge-Durum, Jonas W., Nellis, Jacob, Noroozian, Omid, Okun, Kate, Oxholm, Trevor, Parekh, Tatsat, Pen, Ue-Li, Pullen, Anthony R., Rahmani, Maryam, Ramirez, Mathias M., Roberson, Cody, Rodriguez, Samelys, Roselli, Florian, Sapkota, Deepak, Shire, Konrad, Siebert, Gage L., Siddique, Faizah, Sinclair, Adrian K., Somerville, Rachel S., Stephenson, Ryan, Stevenson, Thomas R., Switzer, Eric R., Termini, Jared, Timbie, Peter T., Trenkamp, Justin, Tucker, Carole E., Visbal, Elijah, Volpert, Carolyn G., Watson, Joseph, Weeks, Eric, Wollack, Edward J., Yang, Shengqi, and Yung, Aaron
Published: 2024
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12. Microstructure Analysis of Bismuth Absorbers for Transition-Edge Sensor X-ray Microcalorimeters

Author: Yan, Daikang, Divan, Ralu, Gades, Lisa M., Kenesei, Peter, Madden, Timothy J., Miceli, Antonino, Park, Jun-Sang, Patel, Umeshkumar M., Quaranta, Orlando, Sharma, Hemant, Bennett, Douglas A., Doriese, William B., Fowler, Joseph W., Gard, Johnathon D., Hays-Wehle, James P., Morgan, Kelsey M., Schmidt, Daniel R., Swetz, Daniel S., and Ullom, Joel N.
Published: 2018
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13. EXCLAIM: the EXperiment for Cryogenic Large-Aperture Intensity Mapping

Author: Essinger-Hileman, Thomas M., primary, Ade, Peter A. R., additional, Anderson, Christopher J., additional, Barlis, Alyssa, additional, Barrentine, Emily M., additional, Beeman, Jeffrey W., additional, Bellis, Nicholas G., additional, Bolatto, Alberto D., additional, Breysse, Patrick, additional, Bulcha, Berhanu, additional, Cataldo, Giuseppe, additional, Chevres Fernandez, Lee Roger, additional, Cho, Chullhee, additional, Connors, Jake A., additional, Cursey, Paul W., additional, Ehsan, Negar, additional, Glenn, Jason, additional, Golec, Joseph E., additional, Hays-Wehle, James, additional, Hess, Larry A., additional, Jahromi, Amir E., additional, Jenkins, Trevian, additional, Kimball, Mark, additional, Kogut, Alan J., additional, Lowe, Luke N., additional, Mauskopf, Philip D., additional, McMahon, Jeffrey J., additional, Mirzaei, Mona, additional, Moseley, Samuel H., additional, Mugge-Durum, Jonas W., additional, Noroozian, Omid, additional, Oxholm, Trevor M., additional, Parekh, Tatsat, additional, Pen, Ue-Li, additional, Pullen, Anthony R., additional, Rahmani, Maryam, additional, Rodriguez, Samelys, additional, Shire, Konrad, additional, Siebert, Gage L., additional, Sinclair, Adrian K., additional, Somerville, Rachel, additional, Stephenson, Ryan C., additional, Stevenson, Thomas R., additional, Switzer, Eric R., additional, Timbie, Peter T., additional, Termini, Jared, additional, Trenkamp, Justin, additional, Tucker, Carole E., additional, Visbal, Elijah, additional, Volpert, Carolyn, additional, Watson, Joseph, additional, Wollack, Edward, additional, Yang, Shengqi, additional, and Yung, L. Y. Aaron, additional
Published: 2022
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14. Developing a new generation of integrated micro-spec far-infrared spectrometers for the experiment for cryogenic large-aperture intensity mapping (EXCLAIM)

Author: Volpert, Carolyn G., primary, Barrentine, Emily M., additional, Mirzaei, Mona, additional, Barlis, Alyssa, additional, Bolatto, Alberto D., additional, Bulcha, Berhanu T., additional, Cataldo, Giuseppe, additional, Connors, Jake A., additional, Costen, Nicholas P., additional, Ehsan, Negar, additional, Essinger-Hileman, Thomas, additional, Glenn, Jason, additional, Hays-Wehle, James P., additional, Hess, Larry A., additional, Kogut, Alan J., additional, Moseley, Harvey, additional, Mugge-Durum, Jonas, additional, Noroozian, Omid, additional, Oxholm, Trevor M., additional, Rahmani, Maryam, additional, Stevenson, Thomas R., additional, Switzer, Eric R., additional, Watson, Joeseph, additional, and Wollack, Edward J., additional
Published: 2022
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15. Operational Optimization to Maximize Dynamic Range in EXCLAIM Microwave Kinetic Inductance Detectors

Author: Oxholm, Trevor M., primary, Switzer, Eric R., additional, Barrentine, Emily M., additional, Essinger-Hileman, Thomas, additional, Hays-Wehle, James P., additional, Mauskopf, Philip D., additional, Noroozian, Omid, additional, Rahmani, Maryam, additional, Sinclair, Adrian K., additional, Stephenson, Ryan, additional, Stevenson, Thomas R., additional, Timbie, Peter T., additional, Volpert, Carolyn, additional, and Weeks, Eric, additional
Published: 2022
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16. Single spin asymmetry A N in polarized proton–proton elastic scattering at √ s = 200 GeV

Author: Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P, Seele, Joseph Patrick, Steadman, Stephen G., van Nieuwenhuizen, Gerrit J, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P, Seele, Joseph Patrick, Steadman, Stephen G., and van Nieuwenhuizen, Gerrit J
Abstract: We report a high precision measurement of the transverse single spin asymmetry AN at the center of mass energy s=200GeV in elastic proton-proton scattering by the STAR experiment at RHIC. The AN was measured in the four-momentum transfer squared t range 0.003≤|t|≤0.035(GeV/c)2, the region of a significant interference between the electromagnetic and hadronic scattering amplitudes. The measured values of AN and its t-dependence are consistent with a vanishing hadronic spin-flip amplitude, thus providing strong constraints on the ratio of the single spin-flip to the non-flip amplitudes. Since the hadronic amplitude is dominated by the Pomeron amplitude at this s, we conclude that this measurement addresses the question about the presence of a hadronic spin flip due to the Pomeron exchange in polarized proton-proton elastic scattering. © 2013 Elsevier B.V.
Published: 2022

17. Characterization of Si-Membrane TES Bolometer Arrays for the HIRMES Instrument

Author: Barrentine, Emily M, Rostem, Karwan, Brekosky, Regis P, Brown, Ari D, Colazo Petit, Felipe A, Costen, Nicholas P, Hays-Wehle, James P, Hsieh, Wen-Ting, Kluengpho, Vorachai, Kutyrev, Alexander S, Maher, Stephen F, Mikula, Vilem, Miller, Timothy M, Oxborrow, Joseph B, Sharp, Elmer H, Watanabe, Tomomi, Wollack, Edward J, and Moseley, Samuel H
Subjects: Spacecraft Instrumentation And Astrionics, Instrumentation And Photography
Abstract: The High Resolution Mid-Infrared Spectrometer (HIRMES) instrument will fly onboard NASA's airborne Stratospheric Observatory for Infrared Astronomy (SOFIA) in 2019. HIRMES will provide astronomers with a unique observing window (25 122 Âµm) for exploring the evolution of protoplanetary disks into young solar systems, and the composition of our Solar System. There are two focal plane detector arrays for the instrument: a high-resolution (/ = 100,000) 8x16 detector array with a target noise-equivalent power, NEP 3x10-18 W/Hz; and a low-resolution (/ = 2,000 19,000) 16x64 detector array with a target NEP 2x10-17 W/Hz. The detectors for both of these arrays are superconducting Mo/Au bilayer transition edge sensor (TES) bolometers on thin suspended single-crystal silicon membranes. Here we present our characterization results for the detectors in both arrays, including measurements of thermal conductance with comparison to phonon transport models, saturation power, noise, and array uniformity.
Published: 2017

18. Optical Characterization & Testbed Development for μ-Spec Integrated Spectrometers

Author: Rahmani, Maryam, Barlis, Alyssa, Barrentine, Emily M., Brown, Ari D., Bulcha, Berhanu T., Cataldo, Giuseppe, Connors, Jake, Ehsan, Negar, Essinger-Hileman, Thomas M., Grant, Henry, Hays-Wehle, James, Hsieh, Wen-Ting, Mikula, Vilem, Moseley, S. Harvey, Noroozian, Omid, Oxholm, Trevor R., Quijada, Manuel A., Patel, Jessica, Stevenson, Thomas R., Switzer, Eric R., Tucker, Carole, U-Yen, Kongpop, Volpert, Carolyn, and Wollack, Edward J.
Subjects: FOS: Physical sciences, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract: This paper describes a cryogenic optical testbed developed to characterize u-Spec spectrometers in a dedicated dilution refrigerator (DR) system. u-Spec is a far-infrared integrated spectrometer that is an analog to a Rowland-type grating spectrometer. It employs a single-crystal silicon substrate with niobium microstrip lines and aluminum kinetic inductance detectors (KIDs). Current designs with a resolution of 512 are in fabrication for the EXCLAIM (Experiment for Cryogenic Large Aperture Intensity Mapping) balloon mission. The primary spectrometer performance and design parameters are efficiency, NEP, inter-channel isolation, spectral resolution, and frequency response for each channel. Here we present the development and design of an optical characterization facility and preliminary validation of that facility with earlier prototype R=64 devices. We have conducted and describe initial optical measurements of R = 64 devices using a swept photomixer line source. We also discuss the test plan for optical characterization of the EXCLAIM R = 512 u-Spec devices in this new testbed., SPIE conference, Montreal, Ca. July 17-22, 2022
Published: 2022
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19. Experiment for cryogenic large-aperture intensity mapping: instrument design

Author: Switzer, Eric R., primary, Barrentine, Emily M., additional, Cataldo, Giuseppe, additional, Essinger-Hileman, Thomas, additional, Ade, Peter A. R., additional, Anderson, Christopher J., additional, Barlis, Alyssa, additional, Beeman, Jeffrey, additional, Bellis, Nicholas, additional, Bolatto, Alberto D., additional, Breysse, Patrick C., additional, Bulcha, Berhanu T., additional, Chevres-Fernanadez, Lee-Roger, additional, Cho, Chullhee, additional, Connors, Jake A., additional, Ehsan, Negar, additional, Glenn, Jason, additional, Golec, Joseph, additional, Hays-Wehle, James P., additional, Hess, Larry A., additional, Jahromi, Amir E., additional, Jenkins, Trevian, additional, Kimball, Mark O., additional, Kogut, Alan J., additional, Lowe, Luke N., additional, Mauskopf, Philip, additional, McMahon, Jeffrey, additional, Mirzaei, Mona, additional, Moseley, Harvey, additional, Mugge-Durum, Jonas, additional, Noroozian, Omid, additional, Oxholm, Trevor M., additional, Parekh, Tatsat, additional, Pen, Ue-Li, additional, Pullen, Anthony R., additional, Rahmani, Maryam, additional, Ramirez, Mathias M., additional, Roselli, Florian, additional, Shire, Konrad, additional, Siebert, Gage, additional, Sinclair, Adrian K., additional, Somerville, Rachel S., additional, Stephenson, Ryan, additional, Stevenson, Thomas R., additional, Timbie, Peter, additional, Termini, Jared, additional, Trenkamp, Justin, additional, Tucker, Carole, additional, Visbal, Elijah, additional, Volpert, Carolyn G., additional, Wollack, Edward J., additional, Yang, Shengqi, additional, and Yung, L. Y. Aaron, additional
Published: 2021
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20. NIST microcalorimeter arrays for the hard x-ray and γ-ray astronomy

Author: Hossen, Md. Arman, primary, Becker, Daniel T., additional, Bennett, Douglas, additional, Dober, Bradley J., additional, Fowler, James, additional, Gard, Johnathon D., additional, Gau, Ephraim, additional, Hays-Wehle, James P., additional, Hilton, Gene C., additional, Kislat, Fabian, additional, Krawczynski, Henric, additional, Mates, John A. B., additional, Nagy, Johanna M., additional, Reintsema, Carl D., additional, Schmidt, Daniel R., additional, Swetz, Daniel S., additional, Ullom, Joel N., additional, Vale, Leila R., additional, and Okajima, Takashi, additional
Published: 2021
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21. Excess Heat Capacity in Mo/Au Transition Edge Sensor Bolometric Detectors

Author: Brown, Ari, primary, Brekosky, Regis, additional, Colazo-Petit, Felipe, additional, Greenhouse, Matthew, additional, Hays-Wehle, James, additional, Kutyrev, Alexander, additional, Mikula, Vilem, additional, Rostem, Karwan, additional, Wollack, Edward, additional, and Moseley, Samuel, additional
Published: 2021
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22. Optical Design of the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM)

Author: Essinger-Hileman, Thomas, Oxholm, Trevor, Siebert, Gage, Ade, Peter, Anderson, Christopher, Barlis, Alyssa, Barrentine, Emily, Beeman, Jeffrey, Bellis, Nicholas, Breysse, Patrick, Bolatto, Alberto, Bulcha, Berhanu, Cataldo, Giuseppe, Connors, Jake, Cursey, Paul, Ehsan, Negar, Fernandez, Lee-Roger, Glenn, Jason, Golec, Joseph, Hays-Wehle, James, Hess, Larry, Jahromi, Amir, Kimball, Mark, Kogut, Alan, Lowe, Luke, Mauskopf, Philip, McMahon, Jeffrey, Mirzaei, Mona, Moseley, Harvey, Mugge-Durum, Jonas, Noroozian, Omid, Pen, Ue-Li, Pullen, Anthony, Rodriguez, Samelys, Shire, Konrad, Sinclair, Adrian, Somerville, Rachel, Stevenson, Thomas, Switzer, Eric, Timbie, Peter, Tucker, Carole, Visbal, Eli, Volpert, Carolyn, Wollack, Edward, Yang, Shengqi, Essinger-Hileman, Thomas, Oxholm, Trevor, Siebert, Gage, Ade, Peter, Anderson, Christopher, Barlis, Alyssa, Barrentine, Emily, Beeman, Jeffrey, Bellis, Nicholas, Breysse, Patrick, Bolatto, Alberto, Bulcha, Berhanu, Cataldo, Giuseppe, Connors, Jake, Cursey, Paul, Ehsan, Negar, Fernandez, Lee-Roger, Glenn, Jason, Golec, Joseph, Hays-Wehle, James, Hess, Larry, Jahromi, Amir, Kimball, Mark, Kogut, Alan, Lowe, Luke, Mauskopf, Philip, McMahon, Jeffrey, Mirzaei, Mona, Moseley, Harvey, Mugge-Durum, Jonas, Noroozian, Omid, Pen, Ue-Li, Pullen, Anthony, Rodriguez, Samelys, Shire, Konrad, Sinclair, Adrian, Somerville, Rachel, Stevenson, Thomas, Switzer, Eric, Timbie, Peter, Tucker, Carole, Visbal, Eli, Volpert, Carolyn, Wollack, Edward, and Yang, Shengqi
Abstract: This work describes the optical design of the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM). EXCLAIM is a balloon-borne telescope that will measure integrated line emission from carbon monoxide (CO) at redshifts z < 1 and ionized carbon ([CII]) at redshifts z = 2.5-3.5 to probe star formation over cosmic time in cross-correlation with galaxy redshift surveys. The EXCLAIM instrument will observe at frequencies of 420--540 GHz using six microfabricated silicon integrated spectrometers with spectral resolving power R = 512 coupled to kinetic inductance detectors (KIDs). A completely cryogenic telescope cooled to a temperature below 5 K provides low-background observations between narrow atmospheric lines in the stratosphere. Off-axis reflective optics use a $90$-cm primary mirror to provide 4.2' full-width at half-maximum (FWHM) resolution at the center of the EXCLAIM band over a field of view of 22.5'. Illumination of the 1.7 K cold stop combined with blackened baffling at multiple places in the optical system ensures low (< -40 dB) edge illumination of the primary to minimize spill onto warmer elements at the top of the dewar., Comment: 15 pages, 8 figures
Published: 2020
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23. Overview and status of EXCLAIM, the experiment for cryogenic large-aperture intensity mapping

Author: Cataldo, Giuseppe, primary, Ade, Peter A. R., additional, Anderson, Christopher J., additional, Barlis, Alyssa, additional, Barrentine, Emily M., additional, Bellis, Nicholas G., additional, Bolatto, Alberto D., additional, Breysse, Patrick C., additional, Bulcha, Berhanu T., additional, Connors, Jake A., additional, Cursey, Paul W., additional, Ehsan, Negar, additional, Essinger-Hileman, Thomas M., additional, Glenn, Jason, additional, Golec, Joseph, additional, Hays-Wehle, James, additional, Hess, Larry A., additional, Jahromi, Amir, additional, Kimball, Mark O., additional, Kogut, Alan J., additional, Lowe, Luke N., additional, Mauskopf, Philip D., additional, McMahon, Jeffrey J., additional, Mirzaei, Mona, additional, Moseley, Samuel H., additional, Mugge-Durum, Jonas W., additional, Noroozian, Omid, additional, Oxholm, Trevor M., additional, Pen, Ue-Li, additional, Pullen, Anthony R., additional, Rodriguez, Samelys, additional, Shirron, Peter J., additional, Siebert, Gage, additional, Sinclair, Adrian K., additional, Somerville, Rachel S., additional, Stephenson, Ryan, additional, Stevenson, Thomas R., additional, Switzer, Eric R., additional, Timbie, Peter T., additional, Tucker, Carole E., additional, Visbal, Elijah, additional, Volpert, Carolyn G., additional, Wollack, Edward J., additional, and Yang, Shengqi, additional
Published: 2020
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24. Optical Design of the Experiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM)

Author: Essinger-Hileman, Thomas M., primary, Oxholm, Trevor M., additional, Siebert, Gage L., additional, Ade, Peter A., additional, Anderson, Christopher J., additional, Barlis, Alyssa, additional, Barrentine, Emily M., additional, Beeman, Jeffrey, additional, Bellis, Nicholas G., additional, Breysse, Patrick C., additional, Bolatto, Alberto D., additional, Bulcha, Berhanu T., additional, Cataldo, Giuseppe, additional, Connors, Jake A., additional, Cursey, Paul W., additional, Ehsan, Negar, additional, Fernandez, Lee-Roger, additional, Glenn, Jason, additional, Golec, Joseph E., additional, Hays-Wehle, James, additional, Hess, Larry, additional, Jahromi, Amir E., additional, Kimball, Mark O., additional, Kogut, Alan, additional, Lowe, Luke N., additional, Mauskopf, Phil, additional, McMahon, Jeffrey, additional, Mirzaei, Mona, additional, Moseley, Harvey, additional, Mugge-Durum, Jonas, additional, Noroozian, Omid, additional, Pen, Ue-Li, additional, Pullen, Anthony R., additional, Rodriguez, Samelys, additional, Shire, Konrad, additional, Sinclair, Adrian, additional, Somerville, Rachel S., additional, Stevenson, Thomas R., additional, Switzer, Eric R., additional, Timbie, Peter, additional, Tucker, Carole, additional, Visbal, Eli, additional, Volpert, Carolyn G., additional, Wollack, Edward J., additional, and Yang, Shengqi, additional
Published: 2020
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25. Developing a new generation of integrated micro-spec far-infrared spectrometers for the experiment for cryogenic large-aperture intensity mapping (EXCLAIM)

Author: Coyle, Laura E., Matsuura, Shuji, Perrin, Marshall D., Volpert, Carolyn G., Barrentine, Emily M., Mirzaei, Mona, Barlis, Alyssa, Bolatto, Alberto D., Bulcha, Berhanu T., Cataldo, Giuseppe, Connors, Jake A., Costen, Nicholas, Ehsan, Negar, Essinger-Hileman, Thomas, Glenn, Jason, Hays-Wehle, James P., Hess, Larry A., Kogut, Alan J., Moseley, Harvey, Mugge-Durum, Jonas, Noroozian, Omid, Oxholm, Trevor M., Rahmani, Maryam, Stevenson, Thomas, Switzer, Eric R., Watson, Joeseph, and Wollack, Edward J.
Published: 2022
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26. Observation of the antimatter helium-4 nucleus

Author: Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Department of Materials Science and Engineering, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G, Redwine, Robert P, Seele, Joseph Patrick, Steadman, Stephen G, Surrow, Bernd, van Nieuwenhuizen, Gerrit J, Walker, Meredith, STAR Collaboration, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Department of Materials Science and Engineering, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G, Redwine, Robert P, Seele, Joseph Patrick, Steadman, Stephen G, Surrow, Bernd, van Nieuwenhuizen, Gerrit J, Walker, Meredith, and STAR Collaboration
Abstract: High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang; in both cases, matter and antimatter are formed with comparable abundance. However, the relatively short-lived expansion in nuclear collisions allows antimatter to decouple quickly from matter, and avoid annihilation. Thus, a high-energy accelerator of heavy nuclei provides an efficient means of producing and studying antimatter. The antimatter helium-4 nucleus (), also known as the anti-(), consists of two antiprotons and two antineutrons (baryon number B = '4). It has not been observed previously, although the -particle was identified a century ago by Rutherford and is present in cosmic radiation at the ten per cent level. Antimatter nuclei with B'1 have been observed only as rare products of interactions at particle accelerators, where the rate of antinucleus production in high-energy collisions decreases by a factor of about 1,000 with each additional antinucleon. Here we report the observation of, the heaviest observed antinucleus to date. In total, 18 counts were detected at the STAR experiment at the Relativistic Heavy Ion Collider (RHIC; ref. 6) in 10 9 recorded gold-on-gold (Au+Au) collisions at centre-of-mass energies of 200 GeV and 62 GeV per nucleon-nucleon pair. The yield is consistent with expectations from thermodynamic and coalescent nucleosynthesis models, providing an indication of the production rate of even heavier antimatter nuclei and a benchmark for possible future observations of in cosmic radiation.
Published: 2019

27. The HOLMES experiment: status and perspective

Author: Ferri, Elena, primary, Alpert, Bradley, additional, Balata, Marco, additional, Becker, Daniel, additional, Bennett, Douglas, additional, Biasotti, Michele, additional, Ceriale, Valentina, additional, De Gerone, Matteo, additional, Dressler, Rugard, additional, Faverzani, Marco, additional, Fowler, Joseph, additional, Gallucci, Giovanni, additional, Gard, John, additional, Gatti, Flavio, additional, Giachero, Andrea, additional, Hays-Wehle, James, additional, Heinitz, Stephan, additional, Hilton, Gene, additional, Köster, Ulli, additional, Lusignoli, Maurizio, additional, Mates, John, additional, Nisi, Stefano, additional, Nucciotti, Angelo, additional, Orlando, Angiola, additional, Pessina, Gianluigi, additional, Puiu, Andrei, additional, Ragazzi, Stefano, additional, Reintsema, Carl, additional, Ribeiro-Gomes, Maria, additional, Schmidt, Dan, additional, Schumann, Dorothea, additional, Swetz, Daniel, additional, Ullom, Joel, additional, and Vale, Leila, additional
Published: 2019
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28. SOFIA-HIRMES: Looking Forward to the HIgh-Resolution Mid-infrarEd Spectrometer

Author: Richards, Samuel N., primary, Moseley, Samuel H., additional, Stacey, Gordon, additional, Greenhouse, Matthew, additional, Kutyrev, Alexander, additional, Arendt, Richard, additional, Atanasoff, Hristo, additional, Banks, Stuart, additional, Brekosky, Regis P., additional, Brown, Ari-David, additional, Bulcha, Berhanu, additional, Cazeau, Tony, additional, Choi, Michael, additional, Colazo, Felipe, additional, Engler, Chuck, additional, Hadjimichael, Theodore, additional, Hays-Wehle, James, additional, Henderson, Chuck, additional, Hsieh, Wen-Ting, additional, Huang, Jeffrey, additional, Jenstrom, Iver, additional, Kellogg, Jim, additional, Kimball, Mark, additional, Kovács, Attila, additional, Leiter, Steve, additional, Maher, Steve, additional, McMurray, Robert, additional, Melnick, Gary J., additional, Mentzell, Eric, additional, Mikula, Vilem, additional, Miller, Timothy M., additional, Nagler, Peter, additional, Nikola, Thomas, additional, Oxborrow, Joseph, additional, Pontoppidan, Klaus M., additional, Rangwala, Naseem, additional, Rhodes, Alan, additional, Roberge, Aki, additional, Rosner, Stefan, additional, Rostem, Karwan, additional, Rustemeyer, Nancy, additional, Sharp, Elmer, additional, Sparr, Leroy, additional, Stevanovic, Dejan, additional, Taraschi, Peter, additional, Temi, Pasquale, additional, Vacca, William D., additional, de Lorenzo, Jordi Vila Hernandez, additional, Wohler, Bill, additional, Wollack, Edward J., additional, and Wilks, Shannon, additional
Published: 2018
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29. Longitudinal Scaling Property of the Charge Balance Function in Au + Au collisions at √s[subscriptNN] = 200GeV

Author: Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, Alan Michael, Jones, C. L., Kocoloski, Adam Philip, Leight, William Axel, STAR Collaboration, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, Alan Michael, Jones, C. L., Kocoloski, Adam Philip, Leight, William Axel, and STAR Collaboration
Abstract: We present measurements of the charge balance function, from the charged particles, for diverse pseudorapidity and transverse momentum ranges in Au + Au collisions at sqrt(s N N ) = 200 GeV using the STAR detector at RHIC. We observe that the balance function is boost-invariant within the pseudorapidity coverage [- 1.3, 1.3]. The balance function properly scaled by the width of the observed pseudorapidity window does not depend on the position or size of the pseudorapidity window. This scaling property also holds for particles in different transverse momentum ranges. In addition, we find that the width of the balance function decreases monotonically with increasing transverse momentum for all centrality classes. Keywords: Longitudinal scaling; Charge balance function; Boost-invariance; Nucleus–nucleus collisions
Published: 2018

30. [J over ψ] polarization in p+p collisions at √s = 200 TeV in STAR

Author: Walker, M., van Nieuwenhuizen, Gerrit Jan, Stevens, Justin, Balewski, Jan T., Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Walker, M., van Nieuwenhuizen, Gerrit Jan, Stevens, Justin, Balewski, Jan T., Corliss, Ross, Hays-Wehle, James Prewitt, and Leight, William Axel
Subjects: Nuclear Experiment
Abstract: We report on a polarization measurement of inclusive [J over ψ] mesons in the di-electron decay channel at mid-rapidity at 2, United States. Dept. of Energy. Office of Science, National Science Foundation (U.S.)
Published: 2014

31. Optical design of the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM)

Author: Zmuidzinas, Jonas, Gao, Jian-Rong, Essinger-Hileman, Thomas, Oxholm, Trevor, Siebert, Gage, Ade, Peter, Anderson, Christopher, Barlis, Alyssa, Barrentine, Emily, Beeman, Jeffrey, Bellis, Nicholas, Breysse, Patrick, Bolatto, Alberto, Bulcha, Berhanu, Cataldo, Giuseppe, Connors, Jake, Cursey, Paul, Ehsan, Negar, Fernandez, Lee-Roger, Glenn, Jason, Golec, Joseph, Hays-Wehle, James, Hess, Larry, Jahromi, Amir, Kimball, Mark, Kogut, Alan, Lowe, Luke, Mauskopf, Philip, McMahon, Jeffrey, Mirzaei, Mona, Moseley, Harvey, Mugge-Durum, Jonas, Noroozian, Omid, Pen, Ue-Li, Pullen, Anthony, Rodriguez, Samelys, Shire, Konrad, Sinclair, Adrian, Somerville, Rachel, Stevenson, Thomas, Switzer, Eric, Timbie, Peter, Tucker, Carole, Visbal, Eli, Volpert, Carolyn, Wollack, Edward, and Yang, Shengqi
Published: 2020
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32. Eliminating the non-Gaussian spectral response of X-ray absorbers for transition-edge sensors

Author: Divan, Ralu, primary, Gades, Lisa M., additional, Kenesei, Peter, additional, Madden, Timothy J., additional, Miceli, Antonino, additional, Park, Jun-Sang, additional, Patel, Umeshkumar M., additional, Quaranta, Orlando, additional, Sharma, Hemant, additional, Bennett, Douglas A., additional, Doriese, William B., additional, Fowler, Joseph W., additional, Gard, Johnathon D., additional, Hays-Wehle, James P., additional, Morgan, Kelsey M., additional, Schmidt, Daniel R., additional, Swetz, Daniel S., additional, and Ullom, Joel N., additional
Published: 2017
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33. Development of ROACH Firmware for Microwave Multiplexed X-Ray TES Microcalorimeters

Author: Madden, Timothy J., primary, Cecil, Thomas W., additional, Gades, Lisa M., additional, Quaranta, Orlando, additional, Yan, Daikang, additional, Miceli, Antonino, additional, Becker, Dan T., additional, Bennett, Doug A., additional, Hays-Wehle, James P., additional, Hilton, Gene C., additional, Gard, Johnathon D., additional, Mates, John A. B., additional, Reintsema, Carl D., additional, Schmidt, Dan R., additional, Swetz, Daniel S., additional, Vale, Leila R., additional, and Ullom, Joel N., additional
Published: 2017
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34. Evolution of the differential transverse momentum correlation function with centrality in Au+Au collisions at √sNN = 200 GeV

Author: Betancourt, Michael Joseph, Balewski, Jan T., Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G, Redwine, Robert P, Seele, Joseph Patrick, Steadman, Stephen G, Surrow, Bernd, van Nieuwenhuizen, Gerrit J, Walker, Matthew H, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Betancourt, Michael Joseph, Balewski, Jan T., Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G, Redwine, Robert P, Seele, Joseph Patrick, Steadman, Stephen G, Surrow, Bernd, van Nieuwenhuizen, Gerrit J, and Walker, Matthew H
Subjects: Nuclear Experiment
Abstract: We present first measurements of the evolution of the differential transverse momentum correlation function, C, with collision centrality in Au. +. Au interactions at √sNN=200 GeV. This observable exhibits a strong dependence on collision centrality that is qualitatively similar to that of number correlations previously reported. We use the observed longitudinal broadening of the near-side peak of C with increasing centrality to estimate the ratio of the shear viscosity to entropy density, η/s, of the matter formed in central Au. +. Au interactions. We obtain an upper limit estimate of η/s that suggests that the produced medium has a small viscosity per unit entropy. Keywords: Azimuthal correlations, QGP, Heavy ion collisions, United States. Department of Energy. Office of Nuclear Physics, United States. Department of Energy. High Energy Physics Division, National Science Foundation (U.S.), Alfred P. Sloan Foundation
Published: 2011

35. Sensor and Method Development for Analysis of Alpha- and Beta-Decaying Radioisotopes Embedded InsideMicrocalorimeter Detectors

Author: Croce, Mark P., primary, Bond, Evelyn M., additional, Hoover, Andrew S., additional, Kunde, Gerd J., additional, Mocko, Veronika, additional, Rabin, Michael, additional, Weisse-Bernstein, Nina R., additional, Wolfsberg, Laura E., additional, Bennett, Douglas A., additional, Hays-Wehle, James, additional, Schmidt, Dan R., additional, and Ullom, Joel N., additional
Published: 2015
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36. Measurement of the 240Pu/239Pu Mass Ratio Using a Transition-Edge-Sensor Microcalorimeter for Total Decay Energy Spectroscopy

Author: Hoover, Andrew S., primary, Bond, Evelyn M., additional, Croce, Mark P., additional, Holesinger, Terry G., additional, Kunde, Gerd J., additional, Rabin, Michael W., additional, Wolfsberg, Laura E., additional, Bennett, Douglas A., additional, Hays-Wehle, James P., additional, Schmidt, Dan R., additional, Swetz, Daniel, additional, and Ullom, Joel N., additional
Published: 2015
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37. Neutral pion cross section and spin asymmetries at intermediate pseudorapidity in polarized proton collisions at √s = 200 GeV

Author: Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Stevens, Justin, van Nieuwenhuizen, Gerrit Jan, Walker, M., Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., Alford, J., Anson, C. D., Aparin, A., Arkhipkin, D., Aschenauer, E. C., Averichev, G. S., Banerjee, A., Barber, B., Barnovska, Z., Beavis, D. R., Bellwied, R., Bhasin, A., Bhati, A. K., Bhattarai, P., Bichsel, H., Bielcik, J., Bielcikova, J., Bland, L. C., Bordyuzhin, I. G., Borowski, W., Bouchet, J., Brandin, A. V., Bridgeman, A., Brovko, S. G., Bültmann, S., Bunzarov, I., Burton, T. P., Butterworth, J., Caines, H., Calderon De La Barca Sanchez, M., Cebra, D., Cendejas, R., Cervantes, M. C., Chaloupka, P., Chang, Z., Chattopadhyay, S., Chen, H. F., Chen, J. H., Chen, L., Cheng, J., Cherney, M., Chikanian, A., Christie, W., Chwastowski, J., Codrington, M. J. M., Cramer, J. G., Crawford, H. J., Cui, X., Das, S., Davila Leyva, A., De Silva, L. C., Debbe, R. R., Dedovich, T. G., Deng, J., Derevschikov, A. A., Derradi de Souza, R., Dhamija, S., di Ruzza, B., Didenko, L., Dilks, C., Ding, F., Dion, A., Djawotho, P., Dong, X., Drachenberg, J. L., Draper, J. E., Du, C. M., Dunkelberger, L. E., Dunlop, James C., Efimov, L. G., Engelage, J., Engle, K. S., Eppley, G., Eun, L., Evdokimov, O., Fatemi, Renee, Fazio, S., Fedorisin, J., Fersch, R. G., Filip, P., Finch, E., Fisyak, Y., Flores, C. E., Gagliardi, C. A., Gangadharan, D. R., Garand, D., Geurts, F. J. M., Gibson, A., Girard, M., Gliske, S., Grosnick, D., Guo, Y., Gupta, A., Gupta, S., Guryn, W., Haag, B., Hajkova, O., Hamed, A., Han, L.-X., Haque, R., Harris, J. W., He, W., Heppelmann, S., Hirsch, A., Hoffmann, G. W., Hofman, D. J., Horvat, S., Huang, B., Huang, H. Z., Huck, P., Humanic, T. J., Igo, G., Jacobs, W. W., Jang, H., Jena, C., Judd, E. G., Kabana, S., Kalinkin, D., Kang, K., Kauder, K., Ke, H. W., Keane, D., Kechechyan, A., Kesich, A., Khan, Z. H., Kikola, D. P., Kisel, I., Kisiel, A., Koetke, D. D., Kollegger, T., Konzer, J., Koralt, I., Korsch, W., Kotchenda, L., Kravtsov, P., Krueger, K., Kulakov, I., Kumar, L., Kycia, R. A., Lamont, M. A. C., Landgraf, J. M., Landry, K. D., Lauret, J., Lebedev, A., Lednicky, R., Lee, J. H., LeVine, M. J., Li, C., Li, W., Li, X., Li, Y., Li, Z. M., Lima, L. M., Lisa, M. A., Liu, F., Ljubicic, T., Llope, W. J., Longacre, R. S., Luo, X., Ma, G. L., Ma, Y. G., Madagodagettige Don, D. M. M. D., Mahapatra, D. P., Majka, R., Manweiler, R., Margetis, S., Markert, C., Masui, H., Matis, H. S., McDonald, D., McShane, T. S., Minaev, N. G., Mioduszewski, S., Mohanty, B., Mondal, M. M., Morozov, D. A., Munhoz, M. G., Mustafa, M. K., Naglis, M., Nandi, B. K., Nasim, Md., Nayak, T. K., Nelson, J. M., Nogach, L. V., Noh, S. Y., Nord, P. M., Novak, J., Nurushev, S. B., Odyniec, G., Ogawa, A., Oh, K., Ohlson, A., Okorokov, V., Oldag, E. W., Oliveira, R. A. N., Olson, D., Pachr, M., Page, B. S., Pal, S. K., Pan, Y. X., Pandit, Y., Panebratsev, Y., Pawlak, T., Pawlik, B., Pei, H., Perkins, C., Peryt, W., Peterson, A., Pile, P., Planinic, M., Pluta, J., Plyku, D., Pochron, W., Poljak, N., Porter, J., Poskanzer, A. M., Powell, C. B., Pruneau, C., Pruthi, N. K., Przybycien, M., Pujahari, P. R., Putschke, J., Qiu, H., Ramachandran, S., Raniwala, R., Raniwala, S., Ray, R. L., Riley, C. K., Ritter, H. G., Roberts, J. B., Rogachevskiy, O. V., Romero, J. L., Ross, J. F., Roy, A., Ruan, L., Rusnak, J., Sahoo, N. R., Sahu, P. K., Sakrejda, I., Salur, S., Sandacz, A., Sandweiss, J., Sangaline, E., Sarkar, A., Schambach, J., Scharenberg, R. P., Schaub, J., Schmah, A. M., Schmidke, W. B., Schmitz, N., Seger, J., Selyuzhenkov, I., Seyboth, P., Shah, N., Shahaliev, E., Shanmuganathan, P. V., Shao, M., Sharma, B., Shen, W. Q., Shi, S. S., Shou, Q. Y., Sichtermann, E. P., Singaraju, R. N., Skoby, M. J., Smirnov, D., Smirnov, N., Solanki, D., Sorensen, P., deSouza, U. G., Spinka, H. M., Srivastava, B., Stanislaus, T. D. S., Stock, R., Strikhanov, M., Stringfellow, B., Suaide, A. A. P., Sumbera, M., Sun, X., Sun, X. M., Sun, Y., Sun, Z., Surrow, B., Svirida, D. N., Symons, T. J. M., Szanto de Toledo, A., Takahashi, J., Tang, A. H., Tang, Z., Tarnowsky, T., Thomas, J. H., Timmins, A. R., Tlusty, D., Tokarev, M., Trentalange, S., Tribble, R. E., Tribedy, P., Trzeciak, B. A., Tsai, O. D., Turnau, J., Ullrich, T., Underwood, D. G., Van Buren, G., Vanfossen, J. A., Varma, R., Vasconcelos, G. M. S., Vasiliev, A. N., Vertesi, R., Videbæk, F., Viyogi, Y. P., Vokal, S., Voloshin, S. A., Vossen, A., Wada, M., Wang, F., Wang, G., Wang, H., Wang, J. S., Wang, Q., Wang, X. L., Wang, Y., Webb, G., Webb, J. C., Westfall, G. D., Wieman, H., Wissink, S. W., Witt, R., Wu, Y. F., Xiao, Z., Xie, W., Xin, K., Xu, H., Xu, N., Xu, Q. H., Xu, W., Xu, Y., Xu, Z., Yan, W., Yang, C., Yang, Y., Ye, Z., Yepes, P., Yi, L., Yip, K., Yoo, I-K., Zawisza, Y., Zbroszczyk, H., Zha, W., Zhang, J. B., Zhang, S., Zhang, X. P., Zhang, Y., Zhang, Z. P., Zhao, F., Zhao, J., Zhong, C., Zhu, X., Zhu, Y. H., Zoulkarneeva, Y., Zyzak, M., Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Stevens, Justin, van Nieuwenhuizen, Gerrit Jan, Walker, M., Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., Alford, J., Anson, C. D., Aparin, A., Arkhipkin, D., Aschenauer, E. C., Averichev, G. S., Banerjee, A., Barber, B., Barnovska, Z., Beavis, D. R., Bellwied, R., Bhasin, A., Bhati, A. K., Bhattarai, P., Bichsel, H., Bielcik, J., Bielcikova, J., Bland, L. C., Bordyuzhin, I. G., Borowski, W., Bouchet, J., Brandin, A. V., Bridgeman, A., Brovko, S. G., Bültmann, S., Bunzarov, I., Burton, T. P., Butterworth, J., Caines, H., Calderon De La Barca Sanchez, M., Cebra, D., Cendejas, R., Cervantes, M. C., Chaloupka, P., Chang, Z., Chattopadhyay, S., Chen, H. F., Chen, J. H., Chen, L., Cheng, J., Cherney, M., Chikanian, A., Christie, W., Chwastowski, J., Codrington, M. J. M., Cramer, J. G., Crawford, H. J., Cui, X., Das, S., Davila Leyva, A., De Silva, L. C., Debbe, R. R., Dedovich, T. G., Deng, J., Derevschikov, A. A., Derradi de Souza, R., Dhamija, S., di Ruzza, B., Didenko, L., Dilks, C., Ding, F., Dion, A., Djawotho, P., Dong, X., Drachenberg, J. L., Draper, J. E., Du, C. M., Dunkelberger, L. E., Dunlop, James C., Efimov, L. G., Engelage, J., Engle, K. S., Eppley, G., Eun, L., Evdokimov, O., Fatemi, Renee, Fazio, S., Fedorisin, J., Fersch, R. G., Filip, P., Finch, E., Fisyak, Y., Flores, C. E., Gagliardi, C. A., Gangadharan, D. R., Garand, D., Geurts, F. J. M., Gibson, A., Girard, M., Gliske, S., Grosnick, D., Guo, Y., Gupta, A., Gupta, S., Guryn, W., Haag, B., Hajkova, O., Hamed, A., Han, L.-X., Haque, R., Harris, J. W., He, W., Heppelmann, S., Hirsch, A., Hoffmann, G. W., Hofman, D. J., Horvat, S., Huang, B., Huang, H. Z., Huck, P., Humanic, T. J., Igo, G., Jacobs, W. W., Jang, H., Jena, C., Judd, E. G., Kabana, S., Kalinkin, D., Kang, K., Kauder, K., Ke, H. W., Keane, D., Kechechyan, A., Kesich, A., Khan, Z. H., Kikola, D. P., Kisel, I., Kisiel, A., Koetke, D. D., Kollegger, T., Konzer, J., Koralt, I., Korsch, W., Kotchenda, L., Kravtsov, P., Krueger, K., Kulakov, I., Kumar, L., Kycia, R. A., Lamont, M. A. C., Landgraf, J. M., Landry, K. D., Lauret, J., Lebedev, A., Lednicky, R., Lee, J. H., LeVine, M. J., Li, C., Li, W., Li, X., Li, Y., Li, Z. M., Lima, L. M., Lisa, M. A., Liu, F., Ljubicic, T., Llope, W. J., Longacre, R. S., Luo, X., Ma, G. L., Ma, Y. G., Madagodagettige Don, D. M. M. D., Mahapatra, D. P., Majka, R., Manweiler, R., Margetis, S., Markert, C., Masui, H., Matis, H. S., McDonald, D., McShane, T. S., Minaev, N. G., Mioduszewski, S., Mohanty, B., Mondal, M. M., Morozov, D. A., Munhoz, M. G., Mustafa, M. K., Naglis, M., Nandi, B. K., Nasim, Md., Nayak, T. K., Nelson, J. M., Nogach, L. V., Noh, S. Y., Nord, P. M., Novak, J., Nurushev, S. B., Odyniec, G., Ogawa, A., Oh, K., Ohlson, A., Okorokov, V., Oldag, E. W., Oliveira, R. A. N., Olson, D., Pachr, M., Page, B. S., Pal, S. K., Pan, Y. X., Pandit, Y., Panebratsev, Y., Pawlak, T., Pawlik, B., Pei, H., Perkins, C., Peryt, W., Peterson, A., Pile, P., Planinic, M., Pluta, J., Plyku, D., Pochron, W., Poljak, N., Porter, J., Poskanzer, A. M., Powell, C. B., Pruneau, C., Pruthi, N. K., Przybycien, M., Pujahari, P. R., Putschke, J., Qiu, H., Ramachandran, S., Raniwala, R., Raniwala, S., Ray, R. L., Riley, C. K., Ritter, H. G., Roberts, J. B., Rogachevskiy, O. V., Romero, J. L., Ross, J. F., Roy, A., Ruan, L., Rusnak, J., Sahoo, N. R., Sahu, P. K., Sakrejda, I., Salur, S., Sandacz, A., Sandweiss, J., Sangaline, E., Sarkar, A., Schambach, J., Scharenberg, R. P., Schaub, J., Schmah, A. M., Schmidke, W. B., Schmitz, N., Seger, J., Selyuzhenkov, I., Seyboth, P., Shah, N., Shahaliev, E., Shanmuganathan, P. V., Shao, M., Sharma, B., Shen, W. Q., Shi, S. S., Shou, Q. Y., Sichtermann, E. P., Singaraju, R. N., Skoby, M. J., Smirnov, D., Smirnov, N., Solanki, D., Sorensen, P., deSouza, U. G., Spinka, H. M., Srivastava, B., Stanislaus, T. D. S., Stock, R., Strikhanov, M., Stringfellow, B., Suaide, A. A. P., Sumbera, M., Sun, X., Sun, X. M., Sun, Y., Sun, Z., Surrow, B., Svirida, D. N., Symons, T. J. M., Szanto de Toledo, A., Takahashi, J., Tang, A. H., Tang, Z., Tarnowsky, T., Thomas, J. H., Timmins, A. R., Tlusty, D., Tokarev, M., Trentalange, S., Tribble, R. E., Tribedy, P., Trzeciak, B. A., Tsai, O. D., Turnau, J., Ullrich, T., Underwood, D. G., Van Buren, G., Vanfossen, J. A., Varma, R., Vasconcelos, G. M. S., Vasiliev, A. N., Vertesi, R., Videbæk, F., Viyogi, Y. P., Vokal, S., Voloshin, S. A., Vossen, A., Wada, M., Wang, F., Wang, G., Wang, H., Wang, J. S., Wang, Q., Wang, X. L., Wang, Y., Webb, G., Webb, J. C., Westfall, G. D., Wieman, H., Wissink, S. W., Witt, R., Wu, Y. F., Xiao, Z., Xie, W., Xin, K., Xu, H., Xu, N., Xu, Q. H., Xu, W., Xu, Y., Xu, Z., Yan, W., Yang, C., Yang, Y., Ye, Z., Yepes, P., Yi, L., Yip, K., Yoo, I-K., Zawisza, Y., Zbroszczyk, H., Zha, W., Zhang, J. B., Zhang, S., Zhang, X. P., Zhang, Y., Zhang, Z. P., Zhao, F., Zhao, J., Zhong, C., Zhu, X., Zhu, Y. H., Zoulkarneeva, Y., and Zyzak, M.
Abstract: The differential cross section and spin asymmetries for neutral pions produced within the intermediate pseudorapidity range 0.8 < η < 2.0 in polarized proton-proton collisions at √s = 200 GeV are presented. Neutral pions were detected using the end cap electromagnetic calorimeter in the STAR detector at RHIC. The cross section was measured over a transverse momentum range of 5 < p[subscript T] < 16 GeV/c and is found to agree with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry A[subscript LL] is measured in the same pseudorapidity range and spans a range of Bjorken-x down to x ≈ 0.01. The measured A[subscript LL] is consistent with model predictions for varying degrees of gluon polarization. The parity-violating asymmetry A[subscript L] is also measured and found to be consistent with zero. The transverse single-spin asymmetry A[subscript N] is measured over a previously unexplored kinematic range in Feynman-x and p[subscript T]. Such measurements may aid our understanding of the onset and kinematic dependence of the large asymmetries observed at more forward pseudorapidity (η ≈ 3) and their underlying mechanisms. The A[subscript N] results presented are consistent with a twist-3 model prediction of a small asymmetry over the present kinematic range., United States. Dept. of Energy. Office of Nuclear Physics, United States. Dept. of Energy. Office of High Energy Physics, National Science Foundation (U.S.)
Published: 2014

38. Fluctuations of charge separation perpendicular to the event plane and local parity violation in √S[subscript NN] = 200 GeV Au + Au collisions at the BNL Relativistic Heavy Ion Collider

Author: Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Stevens, Justin, van Nieuwenhuizen, Gerrit Jan, Walker, M., Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Stevens, Justin, van Nieuwenhuizen, Gerrit Jan, and Walker, M.
Abstract: Previous experimental results based on data (∼15 × 10[superscript 6] events) collected by the STAR detector at the BNL Relativistic Heavy Ion Collider suggest event-by-event charge-separation fluctuations perpendicular to the event plane in noncentral heavy-ion collisions. Here we present the correlator previously used split into its two component parts to reveal correlations parallel and perpendicular to the event plane. The results are from a high-statistics 200-GeV Au + Au collisions data set (57 × 10[superscript 6] events) collected by the STAR experiment. We explicitly count units of charge separation from which we find clear evidence for more charge-separation fluctuations perpendicular than parallel to the event plane. We also employ a modified correlator to study the possible P-even background in same- and opposite-charge correlations, and find that the P-even background may largely be explained by momentum conservation and collective motion., Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, Open Science Grid, United States. Dept. of Energy. Office of Science, National Science Foundation (U.S.), Alfred P. Sloan Foundation
Published: 2014

39. Freeze-out dynamics via charged kaon femtoscopy in √s[subscript NN] = 200 GeV central Au + Au collisions

Author: Massachusetts Institute of Technology. Laboratory for Nuclear Science, Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Stevens, J. R., van Nieuwenhuizen, Gerrit Jan, Walker, M., Balewski, Jan T., Massachusetts Institute of Technology. Laboratory for Nuclear Science, Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Stevens, J. R., van Nieuwenhuizen, Gerrit Jan, Walker, M., and Balewski, Jan T.
Abstract: We present measurements of three-dimensional correlation functions of like-sign, low-transverse-momentum kaon pairs from √s[subscript NN] = 200 GeV Au + Au collisions. A Cartesian surface-spherical harmonic decomposition technique was used to extract the kaon source function. The latter was found to have a three-dimensional Gaussian shape and can be adequately reproduced by Therminator event-generator simulations with resonance contributions taken into account. Compared to the pion one, the kaon source function is generally narrower and does not have the long tail along the pair transverse momentum direction. The kaon Gaussian radii display a monotonic decrease with increasing transverse mass m[subscript T] over the interval of 0.55 ≤ m[subscript T] ≤ 1.15 GeV/c[superscript 2]. While the kaon radii are adequately described by the m[subscript T]-scaling in the outward and sideward directions, in the longitudinal direction the lowest m[subscript T] value exceeds the expectations from a pure hydrodynamical model prediction., United States. Dept. of Energy. Office of Science, National Science Foundation (U.S.), Alfred P. Sloan Foundation
Published: 2014

40. Eliminating the non-Gaussian spectral response of X-ray absorbers for transition-edge sensors.

Author: Daikang Yan, Divan, Ralu, Gades, Lisa M., Kenesei, Peter, Madden, Timothy J., Miceli, Antonino, Jun-Sang Park, Patel, Umeshkumar M., Quaranta, Orlando, Sharma, Hemant, Bennett, Douglas A., Doriese, William B., Fowler, Joseph W., Gard, Johnathon D., Hays-Wehle, James P., Morgan, Kelsey M., Schmidt, Daniel R., Swetz, Daniel S., and Ullom, Joel N.
Subjects: CALORIMETERS, X-ray spectroscopy, TUNED mass dampers, HEAT capacity, BISMUTH
Abstract: Transition-edge sensors (TESs) as microcalorimeters for high-energy-resolution X-ray spectroscopy are often fabricated with an absorber made of materials with high Z (for X-ray stopping power) and low heat capacity (for high resolving power). Bismuth represents one of the most compelling options. TESs with evaporated bismuth absorbers have shown spectra with undesirable and unexplained low-energy tails. We have developed TESs with electroplated bismuth absorbers over a gold layer that are not afflicted by this problem and that retain the other positive aspects of this material. To better understand these phenomena, we have studied a series of TESs with gold, gold/ evaporated bismuth, and gold/electroplated bismuth absorbers, fabricated on the same die with identical thermal coupling. We show that the bismuth morphology is linked to the spectral response of X-ray TES microcalorimeters. [ABSTRACT FROM AUTHOR]
Published: 2017
Full Text: View/download PDF

41. Double helicity asymmetry for charged pion + jet production in p+p collisions at [square root of] s=200 GeV at STAR

Author: Richard G. Milner., Massachusetts Institute of Technology. Department of Physics., Hays-Wehle, James Prewitt, Richard G. Milner., Massachusetts Institute of Technology. Department of Physics., and Hays-Wehle, James Prewitt
Abstract: Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2013., In title on title-page, "[square root of]" appears as the mathematical symbol. Title as it appears in MIT degrees awarded booklet, February 2013: Measurement of double longitudinal spin asymmetry of Jet-[pi] +/- correlations in polarized proton-proton collisions at [square root of] s=200 GeV RHIC Cataloged from PDF version of thesis., Includes bibliographical references (p. 81-83)., Inclusive measurements from polarized proton-proton collisions at RHIC have constrained [Delta]g, the polarized gluon distribution function of the proton. Correlation observables, such as this pion+jet measurement, allow for reconstruction of initial parton kinematics and are thus sensitive to the x dependence of [Delta]g. By measuring charged pions opposite a jet, this particular measurement can be sensitive to the flavor of the struck parton. This measurement, which is dominated by the quark-gluon subprocess, can be divided into terms proportional to [Delta]u[Delta]g and [Delta]d[Delta]g. The relatively larger quark polarization amplifies the measured asymmetry thereby enhancing the statistical power. This thesis presents the result of the mid-rapidity pion+jet longitudinal double spin asymmetry analysis from 10.6 pb-1 of luminosity collected in the 2009 200 GeV p+p run., by James Prewitt Hays-Wehle., Ph.D.
Published: 2013

42. Experimental studies of di-jets in Au + Au collisions using angular correlations with respect to back-to-back leading hadrons

Author: Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, J., Steadman, Stephen G., van Nieuwenhuizen, Gerrit Jan, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, J., Steadman, Stephen G., and van Nieuwenhuizen, Gerrit Jan
Abstract: Jet-medium interactions are studied via a multihadron correlation technique (called “2+1”), where a pair of back-to-back hadron triggers with large transverse momentum is used as a proxy for a di-jet. This work extends the previous analysis for nearly symmetric trigger pairs with the highest momentum threshold of trigger hadron of 5 GeV/c with the new calorimeter-based triggers with energy thresholds of up to 10 GeV and above. The distributions of associated hadrons are studied in terms of correlation shapes and per-trigger yields on each trigger side. In contrast with di-hadron correlation results with single triggers, the associated hadron distributions for back-to-back triggers from central Au+Au data at √sNN=200 GeV show no strong modifications compared to d+Au data at the same energy. An imbalance in the total transverse momentum between hadrons attributed to the near-side and away-side of jetlike peaks is observed. The relative imbalance in the Au+Au measurement with respect to d+Au reference is found to increase with the asymmetry of the trigger pair, consistent with the expectation from medium-induced energy-loss effects. In addition, this relative total transverse momentum imbalance is found to decrease for softer associated hadrons. Such evolution indicates that the energy missing at higher associated momenta is converted into softer hadrons., United States. Dept. of Energy, Alfred P. Sloan Foundation, National Science Foundation (U.S.)
Published: 2013

43. Third harmonic flow of charged particles in Au + Au collisions at √s[subscript NN]=200 GeV

Author: Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Betancourt, Michael Joseph, Balewski, Jan T., Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, J., Steadman, Stephen G., van Nieuwenhuizen, Gerrit Jan, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Betancourt, Michael Joseph, Balewski, Jan T., Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, J., Steadman, Stephen G., and van Nieuwenhuizen, Gerrit Jan
Abstract: We report measurements of the third harmonic coefficient of the azimuthal anisotropy, v[subscript 3], known as triangular flow. The analysis is for charged particles in Au+Au collisions at √s[subscript NN]=200 GeV, based on data from the STAR experiment at the BNL Relativistic Heavy Ion Collider. Two-particle correlations as a function of their pseudorapidity separation are fit with narrow and wide Gaussians. Measurements of triangular flow are extracted from the wide Gaussian, from two-particle cumulants with a pseudorapidity gap, and also from event plane analysis methods with a large pseudorapidity gap between the particles and the event plane. These results are reported as a function of transverse momentum and centrality. A large dependence on the pseudorapidity gap is found. Results are compared with other experiments and model calculations., Brookhaven National Laboratory, Lawrence Berkeley National Laboratory, United States. Dept. of Energy, National Science Foundation (U.S.), Alfred P. Sloan Foundation
Published: 2013

44. Inclusive charged hadron elliptic flow in Au + Au collisions at [√ over S[subscript NN]]=7.7–39 GeV

Author: Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, Joseph Patrick, Steadman, Stephen G., Stephans, George S. F., Surrow, Bernd, Nieuwenhuizen, Gerrit van, Corliss, Ross Cameron, Redwine, Robert P, Steadman, Stephen G, van Nieuwenhuizen, Gerrit J, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, Joseph Patrick, Steadman, Stephen G., Stephans, George S. F., Surrow, Bernd, Nieuwenhuizen, Gerrit van, Corliss, Ross Cameron, Redwine, Robert P, Steadman, Stephen G, and van Nieuwenhuizen, Gerrit J
Abstract: Collider (Pb + Pb collisions at [√ over S[subscript NN]] = 2.76 TeV). The v[subscript 2](p[subscript T]) values for fixed p[subscript T] rise with increasing collision energy within the p[subscript T] range studied (<2 GeV/c). A comparison to viscous hydrodynamic simulations is made to potentially help understand the energy dependence of v[subscript 2](p[subscript T]). We also compare the v[subscript 2] results to UrQMD and AMPT transport model calculations, and physics implications on the dominance of partonic versus hadronic phases in the system created at beam energy scan energies are discussed.
Published: 2013

45. ρ[superscript 0] photoproduction in AuAu collisions at √sNN=62.4 GeV measured with the STAR detector

Author: Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Redwine, Robert P., Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G., Seele, J., Steadman, Stephen G., Surrow, Bernd, van Nieuwenhuizen, Gerrit Jan, Walker, Margaret R., Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Redwine, Robert P., Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G., Seele, J., Steadman, Stephen G., Surrow, Bernd, van Nieuwenhuizen, Gerrit Jan, and Walker, Margaret R.
Abstract: Vector mesons may be photoproduced in relativistic heavy-ion collisions when a virtual photon emitted by one nucleus scatters from the other nucleus, emerging as a vector meson. The STAR Collaboration has previously presented measurements of coherent ρ[superscript 0] photoproduction at center of mass energies of 130 GeV and 200 GeV in AuAu collisions. Here, we present a measurement of the cross section at 62.4 GeV; we find that the cross section for coherent ρ[superscript 0] photoproduction with nuclear breakup is 10.5±1.5±1.6 mb at 62.4 GeV. The cross-section ratio between 200 GeV and 62.4 GeV is 4.4±0.6, less than is predicted by most theoretical models. It is, however, proportionally much larger than the previously observed 15%±55% increase between 130 GeV and 200 GeV.
Published: 2012

46. K[superscript *0] production in Cu + Cu and Au + Au collisions at √s[subscript NN]=62.4 GeV and 200 GeV

Author: Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, A. M., Jones, Christopher LaDon, Kocoloski, Adam Philip, Leight, William Axel, Milner, Richard G., Redwine, Robert P., Sakuma, Tai, Seele, Joseph Patrick, Surrow, Bernd, van Nieuwenhuizen, Gerrit Jan, Walker, Matthew H., Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, A. M., Jones, Christopher LaDon, Kocoloski, Adam Philip, Leight, William Axel, Milner, Richard G., Redwine, Robert P., Sakuma, Tai, Seele, Joseph Patrick, Surrow, Bernd, van Nieuwenhuizen, Gerrit Jan, and Walker, Matthew H.
Abstract: We report on K[superscript *0] production at midrapidity in Au + Au and Cu + Cu collisions at √s[subscript NN]=62.4 and 200 GeV collected by the Solenoid Tracker at the Relativistic Heavy Ion Collider detector. The K[superscript *0] is reconstructed via the hadronic decays K[superscript *0]→K+π− and K[superscript *0̅] →K[superscript −]π[superscript +]. Transverse momentum, pT, spectra are measured over a range of pT extending from 0.2 GeV/c up to 5 GeV/c. The center-of-mass energy and system size dependence of the rapidity density, dN/dy, and the average transverse momentum, 〈pT〉, are presented. The measured N(K[superscript *0])/N(K) and N(φ)/N(K[superscript *0]) ratios favor the dominance of rescattering of decay daughters of K*0 over the hadronic regeneration for the K[superscript *0] production. In the intermediate pT region (2.0
Published: 2012

47. Measurement of the W→eν and Z/γ*→e[superscript +]e[superscript -] production cross sections at mid-rapidity in proton-proton collisions at √s=500 GeV

Author: Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, J., Steadman, Stephen G., Surrow, Bernd, van Nieuwenhuizen, Gerrit Jan, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Redwine, Robert P., Seele, J., Steadman, Stephen G., Surrow, Bernd, and van Nieuwenhuizen, Gerrit Jan
Abstract: We report measurements of the charge-separated W[superscript +(-)]→e[superscript +(-)]+ν[subscript e](ν̅ [subscript e]) and Z/γ[superscript *]→e[superscript +]e[superscript -] production cross sections at mid-rapidity in proton-proton collisions at √s=500 GeV. These results are based on 13.2 pb[superscript -1] of data recorded in 2009 by the STAR detector at RHIC. Production cross sections for W bosons that decay via the eν channel were measured to be σ(pp→W[superscript +]X)·BR(W[superscript +]→e[superscript +]ν[subscript e])=117.3±5.9(stat)±6.2(syst)±15.2(lumi) pb, and σ(pp→W[superscript -]X)·BR(W[superscript -]→e[superscript -]ν̅ [subscript e])=43.3±4.6(stat)± 3.4(syst)±5.6(lumi) pb. For Z/γ[superscript *] production, σ(pp→Z/γ[superscript *]X)·BR(Z/γ[superscript *]→e[superscript +]e[superscript -])=7.7±2.1(stat)[subscript -0.9][superscript +0.5](syst)±1.0(lumi) pb was measured for di-lepton invariant masses m[subscript e]+[subscript e]- between 70 and 110 GeV/c[superscript 2]. First measurements of the W cross section ratio, σ(pp→W[superscript +]X)/σ(pp→W[superscript -]X), at √s=500 GeV are also reported. Theoretical predictions, calculated using recent parton distribution functions, are found to agree with the measured cross sections.
Published: 2012

48. High pT [p subscript T] nonphotonic electron production in p+p collisions at √s=200 [square root of s=200] GeV

Author: Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Surrow, Bernd, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G., Redwine, Robert P., Seele, Joseph Patrick, Steadman, Stephen G., van Nieuwenhuizen, Gerrit Jan, Walker, Matthew H., Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Surrow, Bernd, Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Leight, William Axel, Milner, Richard G., Redwine, Robert P., Seele, Joseph Patrick, Steadman, Stephen G., van Nieuwenhuizen, Gerrit Jan, and Walker, Matthew H.
Abstract: We present the measurement of nonphotonic electron production at high transverse momentum (pT>2.5 GeV/c) [(p subscript T > 2.5 GeV/c)] in p+p collisions at √s=200 [square root of s=200] GeV using data recorded during 2005 and 2008 by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The measured cross sections from the two runs are consistent with each other despite a large difference in photonic background levels due to different detector configurations. We compare the measured nonphotonic electron cross sections with previously published RHIC data and perturbative quantum chromodynamics calculations. Using the relative contributions of B and D mesons to nonphotonic electrons, we determine the integrated cross sections of electrons (e++e-/2) [e superscript + plus e superscript - /2)] at 3 GeV/c
Published: 2011

49. Azimuthal di-hadron correlations in d+ Au and Au + Au collisions at √sNN=200 GeV measured at the STAR detector

Author: Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Milner, Richard G., Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, A. M., Jones, Christopher LaDon, Kocoloski, Adam Philip, Leight, William Axel, Redwine, Robert P., Sakuma, Tai, Seele, Joseph Patrick, Surrow, Bernd, van Nieuwenhuizen, Gerrit Jan, Walker, Matthew H., Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Milner, Richard G., Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, A. M., Jones, Christopher LaDon, Kocoloski, Adam Philip, Leight, William Axel, Redwine, Robert P., Sakuma, Tai, Seele, Joseph Patrick, Surrow, Bernd, van Nieuwenhuizen, Gerrit Jan, and Walker, Matthew H.
Abstract: Yields, correlation shapes, and mean transverse momenta pT [rho tau] of charged particles associated with intermediate- to high-pT [rho tau] trigger particles (2.5
Published: 2011

50. Higher Moments of Net Proton Multiplicity Distributions at RHIC

Author: Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Milner, Richard G., Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, A. M., Jones, Christopher LaDon, Kocoloski, Adam Philip, Leight, William Axel, Redwine, Robert P., Sakuma, Tai, Seele, Joseph Patrick, Surrow, Bernd, Nieuwenhuizen, Gerrit van, Walker, Matthew H., Bates Linear Accelerator Center, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Milner, Richard G., Balewski, Jan T., Betancourt, Michael Joseph, Corliss, Ross Cameron, Hays-Wehle, James Prewitt, Hoffman, A. M., Jones, Christopher LaDon, Kocoloski, Adam Philip, Leight, William Axel, Redwine, Robert P., Sakuma, Tai, Seele, Joseph Patrick, Surrow, Bernd, Nieuwenhuizen, Gerrit van, and Walker, Matthew H.
Abstract: We report the first measurements of the kurtosis (κ [kappa]), skewness (S), and variance (σ [sigma] [superscript 2]) of net-proton multiplicity (N [subscript p]-N [subscript p̅] ) distributions at midrapidity for Au+Au collisions at √sNN=19.6, 62.4, and 200 GeV corresponding to baryon chemical potentials (μ [mu] B) between 200 and 20 MeV. Our measurements of the products κ [kappa]σ [sigma][superscript 2] and Sσ [sigma], which can be related to theoretical calculations sensitive to baryon number susceptibilities and long-range correlations, are constant as functions of collision centrality. We compare these products with results from lattice QCD and various models without a critical point and study the √sNN dependence of κ [kappa] σ [sigma] [superscript 2]. From the measurements at the three beam energies, we find no evidence for a critical point in the QCD phase diagram for μ [mu] [subscript B] below 200 MeV., United States. Dept. of Energy. Office of High Energy Physics., United States. Dept. of Energy. Office of Nuclear Physics, National Science Foundation (U.S.), Alfred P. Sloan Foundation, Deutsche Forschungsgemeinschaft (DFG), Institut national de physique nucléaire et de physique des particules, RA of France, RPL of France, EMN of France, Science and Technology Facilities Council (Great Britain), Engineering and Physical Sciences Research Council, Fundação de Amparo à Pesquisa do Estado de São Paulo, Russian Ministry of Science and Technology, China. Ministry of Energy, China. Ministry of Science and Technology., Chinese Academy of Sciences, National Natural Science Foundation (China), GA of the Czech Republic, IRP of the Czech Republic, FOM of the Netherlands, India. Dept. of Atomic Energy, India. Dept. of Science and Technology, Council of Scientific & Industrial Research (India), Polish State Committee for Scientific Research, Korean Science and Engineering Foundation
Published: 2011

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