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36 results on '"Shaw, E. C."'

1. Analysis of Polarized Dust Emission from the First Flight of the SPIDER Balloon-Borne Telescope

Author

SPIDER Collaboration, Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, A. J., Eriksen, H. K., Filippini, J. P., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gourapura, S., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S. -Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wiebe, D. V., and Young, E. Y.

Subjects
Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Using data from the first flight of SPIDER and from Planck HFI, we probe the properties of polarized emission from interstellar dust in the SPIDER observing region. Component separation algorithms operating in both the spatial and harmonic domains are applied to probe their consistency and to quantify modeling errors associated with their assumptions. Analyses spanning the full SPIDER region demonstrate that i) the spectral energy distribution of diffuse Galactic dust emission is broadly consistent with a modified-blackbody (MBB) model with a spectral index of $\beta_\mathrm{d}=1.45\pm0.05$ $(1.47\pm0.06)$ for $E$ ($B$)-mode polarization, slightly lower than that reported by Planck for the full sky; ii) its angular power spectrum is broadly consistent with a power law; and iii) there is no significant detection of line-of-sight decorrelation of the astrophysical polarization. The size of the SPIDER region further allows for a statistically meaningful analysis of the variation in foreground properties within it. Assuming a fixed dust temperature $T_\mathrm{d}=19.6$ K, an analysis of two independent sub-regions of that field results in inferred values of $\beta_\mathrm{d}=1.52\pm0.06$ and $\beta_\mathrm{d}=1.09\pm0.09$, which are inconsistent at the $3.9\,\sigma$ level. Furthermore, a joint analysis of SPIDER and Planck 217 and 353 GHz data within a subset of the SPIDER region is inconsistent with a simple MBB at more than $3\,\sigma$, assuming a common morphology of polarized dust emission over the full range of frequencies. These modeling uncertainties have a small--but non-negligible--impact on limits on the cosmological tensor-to-scalar ratio derived from the \spider dataset. The fidelity of the component separation approaches of future CMB polarization experiments may thus have a significant impact on their constraining power., Comment: 21 pages, 15 figures

Published
2024

2. In-flight gain monitoring of SPIDER's transition-edge sensor arrays

Author

Filippini, J. P., Gambrel, A. E., Rahlin, A. S., Young, E. Y., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Dore, O., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Fraisse, A. A., Freese, K., Galloway, M., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S. -Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., and Wiebe, D. V.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Experiments deploying large arrays of transition-edge sensors (TESs) often require a robust method to monitor gain variations with minimal loss of observing time. We propose a sensitive and non-intrusive method for monitoring variations in TES responsivity using small square waves applied to the TES bias. We construct an estimator for a TES's small-signal power response from its electrical response that is exact in the limit of strong electrothermal feedback. We discuss the application and validation of this method using flight data from SPIDER, a balloon-borne telescope that observes the polarization of the cosmic microwave background with more than 2000 TESs. This method may prove useful for future balloon- and space-based instruments, where observing time and ground control bandwidth are limited., Comment: 7 pages, 3 figures; Proceedings of the 19th International Workshop on Low Temperature Detectors (LTD19); Minor updates to match published version

Published
2021
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3. A Simulation-Based Method for Correcting Mode Coupling in CMB Angular Power Spectra

Author

Leung, J. S. -Y., Hartley, J., Nagy, J. M., Netterfield, C. B., Shariff, J. A., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., and Young, E. Y.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Modern CMB analysis pipelines regularly employ complex time-domain filters, beam models, masking, and other techniques during the production of sky maps and their corresponding angular power spectra. However, these processes can generate couplings between multipoles from the same spectrum and from different spectra, in addition to the typical power attenuation. Within the context of pseudo-$C_\ell$ based, MASTER-style analyses, the net effect of the time-domain filtering is commonly approximated by a multiplicative transfer function, $F_{\ell}$, that can fail to capture mode mixing and is dependent on the spectrum of the signal. To address these shortcomings, we have developed a simulation-based spectral correction approach that constructs a two-dimensional transfer matrix, $J_{\ell\ell'}$, which contains information about mode mixing in addition to mode attenuation. We demonstrate the application of this approach on data from the first flight of the SPIDER balloon-borne CMB experiment., Comment: 14 pages, 7 figures; updated to match published version

Published
2021
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4. The XFaster Power Spectrum and Likelihood Estimator for the Analysis of Cosmic Microwave Background Maps

Author

Gambrel, A. E., Rahlin, A. S., Song, X., Contaldi, C. R., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, K., Galloway, M., Gandilo, N. N., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S. -Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Reintsema, C., Ruhl, J. E., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., and Young, E. Y.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the XFaster analysis package. XFaster is a fast, iterative angular power spectrum estimator based on a diagonal approximation to the quadratic Fisher matrix estimator. XFaster uses Monte Carlo simulations to compute noise biases and filter transfer functions and is thus a hybrid of both Monte Carlo and quadratic estimator methods. In contrast to conventional pseudo-$C_\ell$ based methods, the algorithm described here requires a minimal number of simulations, and does not require them to be precisely representative of the data to estimate accurate covariance matrices for the bandpowers. The formalism works with polarization-sensitive observations and also data sets with identical, partially overlapping, or independent survey regions. The method was first implemented for the analysis of BOOMERanG data, and also used as part of the Planck analysis. Here, we describe the full, publicly available analysis package, written in Python, as developed for the analysis of data from the 2015 flight of the SPIDER instrument. The package includes extensions for self-consistently estimating null spectra and for estimating fits for Galactic foreground contributions. We show results from the extensive validation of XFaster using simulations, and its application to the SPIDER data set., Comment: 18 pages, 11 figures

Published
2021
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5. A Constraint on Primordial $B$-Modes from the First Flight of the SPIDER Balloon-Borne Telescope

Author

SPIDER Collaboration, Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S. -Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., and Young, E. Y.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the first linear polarization measurements from the 2015 long-duration balloon flight of SPIDER, an experiment designed to map the polarization of the cosmic microwave background (CMB) on degree angular scales. Results from these measurements include maps and angular power spectra from observations of 4.8% of the sky at 95 and 150 GHz, along with the results of internal consistency tests on these data. While the polarized CMB anisotropy from primordial density perturbations is the dominant signal in this region of sky, Galactic dust emission is also detected with high significance; Galactic synchrotron emission is found to be negligible in the SPIDER bands. We employ two independent foreground-removal techniques in order to explore the sensitivity of the cosmological result to the assumptions made by each. The primary method uses a dust template derived from Planck data to subtract the Galactic dust signal. A second approach, employing a joint analysis of SPIDER and Planck data in the harmonic domain, assumes a modified-blackbody model for the spectral energy distribution of the dust with no constraint on its spatial morphology. Using a likelihood that jointly samples the template amplitude and $r$ parameter space, we derive 95% upper limits on the primordial tensor-to-scalar ratio from Feldman-Cousins and Bayesian constructions, finding $r<0.11$ and $r<0.19$, respectively. Roughly half the uncertainty in $r$ derives from noise associated with the template subtraction. New data at 280 GHz from SPIDER's second flight will complement the Planck polarization maps, providing powerful measurements of the polarized Galactic dust emission., Comment: 29 pages, 13 figures

Published
2021

6. Design and pre-flight performance of SPIDER 280 GHz receivers

Author

Shaw, E. C., Ade, P. A. R., Akers, S., Amiri, M., Austermann, J., Beall, J., Becker, D. T., Benton, S. J., Bergman, A. S., Bock, J. J., Bond, J. R., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Domagalski, R. S., Doré, O., Duff, S. M., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fissel, L. M., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Grigorian, A., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, J., Irwin, K. D., Jones, W. C., Kahn, A., Kuo, C. L., Kermish, Z. D., Lennox, A., Leung, J. S. -Y., Li, S., Mason, P. V., Megerian, K., Mocanu, L. M., Moncelsi, L., Morford, T. A., Nagy, J. M., Nie, R., Netterfield, C. B., Nolta, M., Osherson, B., Padilla, I. L., Rahlin, A. S., Redmond, S., Reintsema, C., Romualdez, L. J., Ruhl, J. E., Runyan, M. C., Shariff, J. A., Shiu, C., Soler, J. D., Song, X., Thommesen, H., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., Ullom, J., van der List, J. F., Van Lanen, J., Vissers, M. R., Weber, A. C., Wen, S., Wehus, I. K., Wiebe, D. V., and Young, E. Y.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

In this work we describe upgrades to the Spider balloon-borne telescope in preparation for its second flight, currently planned for December 2021. The Spider instrument is optimized to search for a primordial B-mode polarization signature in the cosmic microwave background at degree angular scales. During its first flight in 2015, Spider mapped ~10% of the sky at 95 and 150 GHz. The payload for the second Antarctic flight will incorporate three new 280 GHz receivers alongside three refurbished 95- and 150 GHz receivers from Spider's first flight. In this work we discuss the design and characterization of these new receivers, which employ over 1500 feedhorn-coupled transition-edge sensors. We describe pre-flight laboratory measurements of detector properties, and the optical performance of completed receivers. These receivers will map a wide area of the sky at 280 GHz, providing new information on polarized Galactic dust emission that will help to separate it from the cosmological signal., Comment: 13 pages, 8 figures; as published in the conference proceedings for SPIE Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X (2020)

Published
2020
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7. Particle response of antenna-coupled TES arrays: results from SPIDER and the lab

Author

Osherson, B., Filippini, J. P., Fu, J., Gramillano, R. V., Gualtieri, R., Shaw, E. C., Ade, P. A. R., Amiri, M., Benton, S. J., Bock, J. J., Bond, J. R., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Dore, O., Fraisse, A. A., Gambrel, A. E., Gandilo, N. N., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Irwin, K. D., Jones, W. C., Kermish, Z. D., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Padilla, I. L., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Shariff, J. A., Soler, J. D., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., Weber, A. C., Wiebe, D. V., and Young, E. Y.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

Future mm-wave and sub-mm space missions will employ large arrays of multiplexed Transition Edge Sensor (TES) bolometers. Such instruments must contend with the high flux of cosmic rays beyond our atmosphere that induce "glitches" in bolometer data, which posed a challenge to data analysis from the Planck bolometers. Future instruments will face the additional challenges of shared substrate wafers and multiplexed readout wiring. In this work we explore the susceptibility of modern TES arrays to the cosmic ray environment of space using two data sets: the 2015 long-duration balloon flight of the SPIDER cosmic microwave background polarimeter, and a laboratory exposure of SPIDER flight hardware to radioactive sources. We find manageable glitch rates and short glitch durations, leading to minimal effect on SPIDER analysis. We constrain energy propagation within the substrate through a study of multi-detector coincidences, and give a preliminary look at pulse shapes in laboratory data., Comment: 9 pages, 6 figures, Proceedings of the 18th International Workshop on Low Temperature Detectors

Published
2020
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8. 280 GHz Focal Plane Unit Design and Characterization for the SPIDER-2 Suborbital Polarimeter

Author

Bergman, A. S., Ade, P. A. R., Akers, S., Amiri, M., Austermann, J. A., Beall, J. A., Becker, D. T., Benton, S. J., Bock, J. J., Bond, J. R., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Domagalski, R. S, Doré, O., Duff, S. M., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fissel, L. M., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Grigorian, A., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, J., Irwin, K. D., Jones, W. C., Khan, A., Kuo, C. L., Kermish, Z. D., Li, S., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Redmond, S., Reintsema, C., Romualdez, L. J., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., Ullom, J., van der List, J. F., Van Lanen, J., Vissers, M. R., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., and Young, E. Y.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

We describe the construction and characterization of the 280 GHz bolometric focal plane units (FPUs) to be deployed on the second flight of the balloon-borne SPIDER instrument. These FPUs are vital to SPIDER's primary science goal of detecting or placing an upper limit on the amplitude of the primordial gravitational wave signature in the cosmic microwave background (CMB) by constraining the B-mode contamination in the CMB from Galactic dust emission. Each 280 GHz focal plane contains a 16 x 16 grid of corrugated silicon feedhorns coupled to an array of aluminum-manganese transition-edge sensor (TES) bolometers fabricated on 150 mm diameter substrates. In total, the three 280 GHz FPUs contain 1,530 polarization sensitive bolometers (765 spatial pixels) optimized for the low loading environment in flight and read out by time-division SQUID multiplexing. In this paper we describe the mechanical, thermal, and magnetic shielding architecture of the focal planes and present cryogenic measurements which characterize yield and the uniformity of several bolometer parameters. The assembled FPUs have high yields, with one array as high as 95% including defects from wiring and readout. We demonstrate high uniformity in device parameters, finding the median saturation power for each TES array to be ~3 pW at 300 mK with a less than 6% variation across each array at one standard deviation. These focal planes will be deployed alongside the 95 and 150 GHz telescopes in the SPIDER-2 instrument, slated to fly from McMurdo Station in Antarctica in December 2018.

Published
2017
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10. In-Flight Gain Monitoring of SPIDER's Transition-Edge Sensor Arrays

Author

Filippini, J. P., Gambrel, A. E., Rahlin, A. S., Young, E. Y., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, Adri J., Eriksen, H. K., Farhang, M., Fraisse, A. A., Freese, Katherine, Galloway, M., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S.-Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., Filippini, J. P., Gambrel, A. E., Rahlin, A. S., Young, E. Y., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, Adri J., Eriksen, H. K., Farhang, M., Fraisse, A. A., Freese, Katherine, Galloway, M., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S.-Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., and Wiebe, D. V.

Abstract

Experiments deploying large arrays of transition-edge sensors (TESs) often require a robust method to monitor gain variations with minimal loss of observing time. We propose a sensitive and non-intrusive method for monitoring variations in TES responsivity using small square waves applied to the TES bias. We construct an estimator for a TES's small-signal power response from its electrical response that is exact in the limit of strong electrothermal feedback. We discuss the application and validation of this method using flight data from SPIDER, a balloon-borne telescope that observes the polarization of the cosmic microwave background with more than 2000 TESs. This method may prove useful for future balloon- and space-based instruments, where observing time and ground control bandwidth are limited.

Published
2022
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11. A Simulation-based Method for Correcting Mode Coupling in CMB Angular Power Spectra

Author

Leung, J. S.-Y., Hartley, J., Nagy, J. M., Netterfield, C. B., Shariff, J. A., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Dore, O., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, Katherine, Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Li, S., Mak, D. S. Y., Mason, P., Megerian, K., Moncelsi, L., Morford, T. A., Nolta, M., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D., Young, E. Y., Leung, J. S.-Y., Hartley, J., Nagy, J. M., Netterfield, C. B., Shariff, J. A., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Dore, O., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, Katherine, Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Li, S., Mak, D. S. Y., Mason, P., Megerian, K., Moncelsi, L., Morford, T. A., Nolta, M., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D., and Young, E. Y.

Abstract

Modern cosmic microwave background (CMB) analysis pipelines regularly employ complex time-domain filters, beam models, masking, and other techniques during the production of sky maps and their corresponding angular power spectra. However, these processes can generate couplings between multipoles from the same spectrum and from different spectra, in addition to the typical power attenuation. Within the context of pseudo-C-l based, MASTER-style analyses, the net effect of the time-domain filtering is commonly approximated by a multiplicative transfer function, F-l , that can fail to capture mode mixing and is dependent on the spectrum of the signal. To address these shortcomings, we have developed a simulation-based spectral correction approach that constructs a two-dimensional transfer matrix, J(ll'), which contains information about mode mixing in addition to mode attenuation. We demonstrate the application of this approach on data from the first flight of the Spider balloon-borne CMB experiment.

Published
2022
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12. A Constraint on Primordial B-modes from the First Flight of the Spider Balloon-borne Telescope

Author

Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, Adri J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, Katherine, Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S.-Y., Li, S., Mak, D. S. Y., Mason, P., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D., Young, E. Y., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, Adri J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, Katherine, Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S.-Y., Li, S., Mak, D. S. Y., Mason, P., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., van der List, J. F., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D., and Young, E. Y.

Abstract

We present the first linear polarization measurements from the 2015 long-duration balloon flight of SPIDER, which is an experiment that is designed to map the polarization of the cosmic microwave background (CMB) on degree angular scales. The results from these measurements include maps and angular power spectra from observations of 4.8% of the sky at 95 and 150 GHz, along with the results of internal consistency tests on these data. While the polarized CMB anisotropy from primordial density perturbations is the dominant signal in this region of sky, Galactic dust emission is also detected with high significance. Galactic synchrotron emission is found to be negligible in the SPIDER bands. We employ two independent foreground-removal techniques to explore the sensitivity of the cosmological result to the assumptions made by each. The primary method uses a dust template derived from Planck data to subtract the Galactic dust signal. A second approach, which constitutes a joint analysis of SPIDER and Planck data in the harmonic domain, assumes a modified-blackbody model for the spectral energy distribution of the dust with no constraint on its spatial morphology. Using a likelihood that jointly samples the template amplitude and r parameter space, we derive 95% upper limits on the primordial tensor-to-scalar ratio from Feldman-Cousins and Bayesian constructions, finding r < 0.11 and r < 0.19, respectively. Roughly half the uncertainty in r derives from noise associated with the template subtraction. New data at 280 GHz from SPIDER´s second flight will complement the Planck polarization maps, providing powerful measurements of the polarized Galactic dust emission.

Published
2022
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13. In-Flight Gain Monitoring of SPIDER’s Transition-Edge Sensor Arrays

Author

Filippini, J. P., primary, Gambrel, A. E., additional, Rahlin, A. S., additional, Young, E. Y., additional, Ade, P. A. R., additional, Amiri, M., additional, Benton, S. J., additional, Bergman, A. S., additional, Bihary, R., additional, Bock, J. J., additional, Bond, J. R., additional, Bonetti, J. A., additional, Bryan, S. A., additional, Chiang, H. C., additional, Contaldi, C. R., additional, Doré, O., additional, Duivenvoorden, A. J., additional, Eriksen, H. K., additional, Farhang, M., additional, Fraisse, A. A., additional, Freese, K., additional, Galloway, M., additional, Gandilo, N. N., additional, Ganga, K., additional, Gualtieri, R., additional, Gudmundsson, J. E., additional, Halpern, M., additional, Hartley, J., additional, Hasselfield, M., additional, Hilton, G., additional, Holmes, W., additional, Hristov, V. V., additional, Huang, Z., additional, Irwin, K. D., additional, Jones, W. C., additional, Karakci, A., additional, Kuo, C. L., additional, Kermish, Z. D., additional, Leung, J. S.- Y., additional, Li, S., additional, Mak, D. S. Y., additional, Mason, P. V., additional, Megerian, K., additional, Moncelsi, L., additional, Morford, T. A., additional, Nagy, J. M., additional, Netterfield, C. B., additional, Nolta, M., additional, O’Brient, R., additional, Osherson, B., additional, Padilla, I. L., additional, Racine, B., additional, Reintsema, C., additional, Ruhl, J. E., additional, Runyan, M. C., additional, Ruud, T. M., additional, Shariff, J. A., additional, Shaw, E. C., additional, Shiu, C., additional, Soler, J. D., additional, Song, X., additional, Trangsrud, A., additional, Tucker, C., additional, Tucker, R. S., additional, Turner, A. D., additional, List, J. F. van der, additional, Weber, A. C., additional, Wehus, I. K., additional, Wen, S., additional, and Wiebe, D. V., additional

Published
2022
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14. A Simulation-based Method for Correcting Mode Coupling in CMB Angular Power Spectra

Author

Leung, J. S.-Y., primary, Hartley, J., additional, Nagy, J. M., additional, Netterfield, C. B., additional, Shariff, J. A., additional, Ade, P. A. R., additional, Amiri, M., additional, Benton, S. J., additional, Bergman, A. S., additional, Bihary, R., additional, Bock, J. J., additional, Bond, J. R., additional, Bonetti, J. A., additional, Bryan, S. A., additional, Chiang, H. C., additional, Contaldi, C. R., additional, Doré, O., additional, Duivenvoorden, A. J., additional, Eriksen, H. K., additional, Farhang, M., additional, Filippini, J. P., additional, Fraisse, A. A., additional, Freese, K., additional, Galloway, M., additional, Gambrel, A. E., additional, Gandilo, N. N., additional, Ganga, K., additional, Gualtieri, R., additional, Gudmundsson, J. E., additional, Halpern, M., additional, Hasselfield, M., additional, Hilton, G., additional, Holmes, W., additional, Hristov, V. V., additional, Huang, Z., additional, Irwin, K. D., additional, Jones, W. C., additional, Karakci, A., additional, Kuo, C. L., additional, Kermish, Z. D., additional, Li, S., additional, Mak, D. S. Y., additional, Mason, P. V., additional, Megerian, K., additional, Moncelsi, L., additional, Morford, T. A., additional, Nolta, M., additional, O’Brient, R., additional, Osherson, B., additional, Padilla, I. L., additional, Racine, B., additional, Rahlin, A. S., additional, Reintsema, C., additional, Ruhl, J. E., additional, Runyan, M. C., additional, Ruud, T. M., additional, Shaw, E. C., additional, Shiu, C., additional, Soler, J. D., additional, Song, X., additional, Trangsrud, A., additional, Tucker, C., additional, Tucker, R. S., additional, Turner, A. D., additional, van der List, J. F., additional, Weber, A. C., additional, Wehus, I. K., additional, Wen, S., additional, Wiebe, D. V., additional, and Young, E. Y., additional

Published
2022
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15. A Constraint on Primordial B-modes from the First Flight of the Spider Balloon-borne Telescope

Author

Ade, P. A. R., primary, Amiri, M., additional, Benton, S. J., additional, Bergman, A. S., additional, Bihary, R., additional, Bock, J. J., additional, Bond, J. R., additional, Bonetti, J. A., additional, Bryan, S. A., additional, Chiang, H. C., additional, Contaldi, C. R., additional, Doré, O., additional, Duivenvoorden, A. J., additional, Eriksen, H. K., additional, Farhang, M., additional, Filippini, J. P., additional, Fraisse, A. A., additional, Freese, K., additional, Galloway, M., additional, Gambrel, A. E., additional, Gandilo, N. N., additional, Ganga, K., additional, Gualtieri, R., additional, Gudmundsson, J. E., additional, Halpern, M., additional, Hartley, J., additional, Hasselfield, M., additional, Hilton, G., additional, Holmes, W., additional, Hristov, V. V., additional, Huang, Z., additional, Irwin, K. D., additional, Jones, W. C., additional, Karakci, A., additional, Kuo, C. L., additional, Kermish, Z. D., additional, Leung, J. S.-Y., additional, Li, S., additional, Mak, D. S. Y., additional, Mason, P. V., additional, Megerian, K., additional, Moncelsi, L., additional, Morford, T. A., additional, Nagy, J. M., additional, Netterfield, C. B., additional, Nolta, M., additional, O’Brient, R., additional, Osherson, B., additional, Padilla, I. L., additional, Racine, B., additional, Rahlin, A. S., additional, Reintsema, C., additional, Ruhl, J. E., additional, Runyan, M. C., additional, Ruud, T. M., additional, Shariff, J. A., additional, Shaw, E. C., additional, Shiu, C., additional, Soler, J. D., additional, Song, X., additional, Trangsrud, A., additional, Tucker, C., additional, Tucker, R. S., additional, Turner, A. D., additional, van der List, J. F., additional, Weber, A. C., additional, Wehus, I. K., additional, Wen, S., additional, Wiebe, D. V., additional, and Young, E. Y., additional

Published
2022
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16. The XFaster Power Spectrum and Likelihood Estimator for the Analysis of Cosmic Microwave Background Maps

Author

Gambrel, A. E., primary, Rahlin, A. S., additional, Song, X., additional, Contaldi, C. R., additional, Ade, P. A. R., additional, Amiri, M., additional, Benton, S. J., additional, Bergman, A. S., additional, Bihary, R., additional, Bock, J. J., additional, Bond, J. R., additional, Bonetti, J. A., additional, Bryan, S. A., additional, Chiang, H. C., additional, Duivenvoorden, A. J., additional, Eriksen, H. K., additional, Farhang, M., additional, Filippini, J. P., additional, Fraisse, A. A., additional, Freese, K., additional, Galloway, M., additional, Gandilo, N. N., additional, Gualtieri, R., additional, Gudmundsson, J. E., additional, Halpern, M., additional, Hartley, J., additional, Hasselfield, M., additional, Hilton, G., additional, Holmes, W., additional, Hristov, V. V., additional, Huang, Z., additional, Irwin, K. D., additional, Jones, W. C., additional, Karakci, A., additional, Kuo, C. L., additional, Kermish, Z. D., additional, Leung, J. S.-Y., additional, Li, S., additional, Mak, D. S. Y., additional, Mason, P. V., additional, Megerian, K., additional, Moncelsi, L., additional, Morford, T. A., additional, Nagy, J. M., additional, Netterfield, C. B., additional, Nolta, M., additional, O’Brient, R., additional, Osherson, B., additional, Padilla, I. L., additional, Racine, B., additional, Reintsema, C., additional, Ruhl, J. E., additional, Ruud, T. M., additional, Shariff, J. A., additional, Shaw, E. C., additional, Shiu, C., additional, Soler, J. D., additional, Trangsrud, A., additional, Tucker, C., additional, Tucker, R. S., additional, Turner, A. D., additional, List, J. F. van der, additional, Weber, A. C., additional, Wehus, I. K., additional, Wen, S., additional, Wiebe, D. V., additional, and Young, E. Y., additional

Published
2021
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17. A Constraint on Primordial B-Modes from the First Flight of the SPIDER Balloon-Borne Telescope

Author

Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S. -Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., List, J. F. van der, Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., Young, E. Y., Ade, P. A. R., Amiri, M., Benton, S. J., Bergman, A. S., Bihary, R., Bock, J. J., Bond, J. R., Bonetti, J. A., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Doré, O., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Irwin, K. D., Jones, W. C., Karakci, A., Kuo, C. L., Kermish, Z. D., Leung, J. S. -Y., Li, S., Mak, D. S. Y., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., O'Brient, R., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Reintsema, C., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., List, J. F. van der, Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., and Young, E. Y.

Abstract

We present the first linear polarization measurements from the 2015 long-duration balloon flight of SPIDER, an experiment designed to map the polarization of the cosmic microwave background (CMB) on degree angular scales. Results from these measurements include maps and angular power spectra from observations of 4.8% of the sky at 95 and 150 GHz, along with the results of internal consistency tests on these data. While the polarized CMB anisotropy from primordial density perturbations is the dominant signal in this region of sky, Galactic dust emission is also detected with high significance; Galactic synchrotron emission is found to be negligible in the SPIDER bands. We employ two independent foreground-removal techniques in order to explore the sensitivity of the cosmological result to the assumptions made by each. The primary method uses a dust template derived from Planck data to subtract the Galactic dust signal. A second approach, employing a joint analysis of SPIDER and Planck data in the harmonic domain, assumes a modified-blackbody model for the spectral energy distribution of the dust with no constraint on its spatial morphology. Using a likelihood that jointly samples the template amplitude and r parameter space, we derive 95% upper limits on the primordial tensor-to-scalar ratio from Feldman-Cousins and Bayesian constructions, finding r<0.11 and r<0.19, respectively. Roughly half the uncertainty in r derives from noise associated with the template subtraction. New data at 280 GHz from SPIDER's second flight will complement the Planck polarization maps, providing powerful measurements of the polarized Galactic dust emission.

Published
2021

18. Design and pre-flight performance of SPIDER 280 GHz receivers

Author

Shaw, E. C., primary, Ade, P.A.R., additional, Akers, S., additional, Amiri, M., additional, Austermann, Jason E., additional, Beall, James A., additional, Becker, D.T., additional, Benton, S.J., additional, Bergman, A. S., additional, Bock, J.J., additional, Bond, J.R., additional, Bryan, S.A., additional, Chiang, H.C., additional, Contaldi, C.R., additional, Domagalski, R.S., additional, Dore, O., additional, Duff, S. M., additional, Duivenvoorden, A.J., additional, Eriksen, H.K., additional, Farhang, M., additional, Filippini, J. P., additional, Fissel, L.M., additional, Fraisse, A.A., additional, Freese, K., additional, Galloway, M., additional, Gambrel, A. E., additional, Gandilo, N.N., additional, Ganga, K., additional, Grigorian, A., additional, Gualtieri, R, additional, Gudmundsson, J.E., additional, Halpern, M., additional, Hartley, J., additional, Hasselfield, M., additional, Hilton, G., additional, Holmes, W., additional, Hristov, V.V., additional, Huang, Z., additional, Hubmayr, Johannes, additional, Irwin, K.D., additional, Jones, W.C., additional, Kahn, A., additional, Kuo, C.L., additional, Kermish, Z.D., additional, Lennox, A., additional, Leung, J. S.-Y., additional, Megerian, K., additional, Reintsema, C., additional, Li, S., additional, Mason, P.V., additional, Runyan, M. C., additional, Moncelsi, L., additional, Morford, T.A., additional, Nagy, J.M., additional, Nie, R., additional, Mocanu, L. M., additional, Padilla, I.L., additional, Netterfield, C. B., additional, Osherson, B., additional, Rahlin, A.S., additional, Redmond, S., additional, Turner, A. D., additional, Romualdez, L.J., additional, Nolta, M., additional, Ruhl, J.E., additional, Shariff, J.A., additional, Shiu, C., additional, Soler, J.D., additional, Song, X., additional, Trangsrud, A., additional, Thommesen, H., additional, Tucker, C, additional, Tucker, R.S., additional, Ullom, Joel, additional, van der List, J.F., additional, Van Lanen, Jeff, additional, Vissers, M. R., additional, Weber, A. C., additional, Wen, S., additional, Wehus, I.K., additional, Wiebe, D.V., additional, and Young, E.Y., additional

Published
2020
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19. Particle Response of Antenna-Coupled TES Arrays: Results from SPIDER and the Laboratory

Author

Osherson, B., primary, Filippini, J. P., additional, Fu, J., additional, Gramillano, R. V., additional, Gualtieri, R., additional, Shaw, E. C., additional, Ade, P. A. R., additional, Amiri, M., additional, Benton, S. J., additional, Bock, J. J., additional, Bond, J. R., additional, Bryan, S. A., additional, Chiang, H. C., additional, Contaldi, C. R., additional, Dore, O., additional, Fraisse, A. A., additional, Gambrel, A. E., additional, Gandilo, N. N., additional, Gudmundsson, J. E., additional, Halpern, M., additional, Hartley, J. W., additional, Hasselfield, M., additional, Hilton, G., additional, Holmes, W., additional, Hristov, V. V., additional, Irwin, K. D., additional, Jones, W. C., additional, Kermish, Z. D., additional, Mason, P. V., additional, Megerian, K., additional, Moncelsi, L., additional, Morford, T. A., additional, Nagy, J. M., additional, Netterfield, C. B., additional, Padilla, I. L., additional, Rahlin, A. S., additional, Reintsema, C., additional, Ruhl, J. E., additional, Runyan, M. C., additional, Shariff, J. A., additional, Soler, J. D., additional, Trangsrud, A., additional, Tucker, C., additional, Tucker, R. S., additional, Turner, A. D., additional, Weber, A. C., additional, Wiebe, D. V., additional, and Young, E. Y., additional

Published
2020
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20. Design and pre-flight performance of SPIDER 280 GHz receivers

Author

Zmuidzinas, Jonas, Gao, Jian-Rong, Shaw, E. C., Ade, P.A.R., Akers, S., Amiri, M., Austermann, Jason E., Beall, James A., Becker, D.T., Benton, S.J., Bergman, A. S., Bock, J. J., Bond, J.R., Bryan, S.A., Chiang, H.C., Contaldi, C.R., Domagalski, R.S., Doré, O., Duff, S. M., Duivenvoorden, A.J., Eriksen, H.K., Farhang, M., Filippini, J. P., Fissel, L.M., Fraisse, A.A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N.N., Ganga, K., Grigorian, A., Gualtieri, R, Gudmundsson, J.E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, Johannes, Irwin, K.D., Jones, W.C., Kahn, A., Kuo, C.L., Kermish, Z.D., Lennox, A., Leung, J. S.-Y., Megerian, K., Reintsema, C., Li, S., Mason, P. V., Runyan, M. C., Moncelsi, L., Morford, T. A., Nagy, J.M., Nie, R., Mocanu, L. M., Padilla, I.L., Netterfield, C. B., Osherson, B., Rahlin, A.S., Redmond, S., Turner, A. D., Romualdez, L.J., Nolta, M., Ruhl, J.E., Shariff, J.A., Shiu, C., Soler, J.D., Song, X., Trangsrud, A., Thommesen, H., Tucker, C, Tucker, R. S., Ullom, Joel, van der List, J.F., Van Lanen, Jeff, Vissers, M. R., Weber, A. C., Wen, S., Wehus, I.K., Wiebe, D.V., Young, E.Y., Zmuidzinas, Jonas, Gao, Jian-Rong, Shaw, E. C., Ade, P.A.R., Akers, S., Amiri, M., Austermann, Jason E., Beall, James A., Becker, D.T., Benton, S.J., Bergman, A. S., Bock, J. J., Bond, J.R., Bryan, S.A., Chiang, H.C., Contaldi, C.R., Domagalski, R.S., Doré, O., Duff, S. M., Duivenvoorden, A.J., Eriksen, H.K., Farhang, M., Filippini, J. P., Fissel, L.M., Fraisse, A.A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N.N., Ganga, K., Grigorian, A., Gualtieri, R, Gudmundsson, J.E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, Johannes, Irwin, K.D., Jones, W.C., Kahn, A., Kuo, C.L., Kermish, Z.D., Lennox, A., Leung, J. S.-Y., Megerian, K., Reintsema, C., Li, S., Mason, P. V., Runyan, M. C., Moncelsi, L., Morford, T. A., Nagy, J.M., Nie, R., Mocanu, L. M., Padilla, I.L., Netterfield, C. B., Osherson, B., Rahlin, A.S., Redmond, S., Turner, A. D., Romualdez, L.J., Nolta, M., Ruhl, J.E., Shariff, J.A., Shiu, C., Soler, J.D., Song, X., Trangsrud, A., Thommesen, H., Tucker, C, Tucker, R. S., Ullom, Joel, van der List, J.F., Van Lanen, Jeff, Vissers, M. R., Weber, A. C., Wen, S., Wehus, I.K., Wiebe, D.V., and Young, E.Y.

Abstract

In this work we describe upgrades to the Spider balloon-borne telescope in preparation for its second flight, currently planned for December 2021. The Spider instrument is optimized to search for a primordial B-mode polarization signature in the cosmic microwave background at degree angular scales. During its first flight in 2015, Spider mapped ~10% of the sky at 95 and 150 GHz. The payload for the second Antarctic flight will incorporate three new 280 GHz receivers alongside three refurbished 95- and 150 GHz receivers from Spider's first flight. In this work we discuss the design and characterization of these new receivers, which employ over 1500 feedhorn-coupled transition-edge sensors. We describe pre-flight laboratory measurements of detector properties, and the optical performance of completed receivers. These receivers will map a wide area of the sky at 280 GHz, providing new information on polarized Galactic dust emission that will help to separate it from the cosmological signal.

Published
2020

21. In-flight performance of SPIDER's 280 GHz receivers

Author

Zmuidzinas, Jonas, Gao, Jian-Rong, Shaw, E. C., Ade, P. A. R., Akers, S., Amiri, M., Austermann, J., Beall, J., Becker, D. T., Benton, S. J., Bergman, A. S., Bock, J. J., Bond, J. R., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Domagalski, R. S., Doré, O., Duff, S. M., Duivenvoorden, A. J., Ericksen, H. K., Farhang, M., Filippini, J. P., Fissel, L. M., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Gibbs, S. M., Gourapura, S., Grigorian, A., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, J., Irwin, K. D., Jones, W. C., Kahn, A., Kermish, Z. D., King, C., Kuo, C. L., Lennox, A. R., Leung, J. S.-Y., Li, S., Luu, T. V., Mason, P. V., May, J., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Nie, R., Netterfield, C. B., Nolta, M., Osherson, B., Padilla, I. L., Rahlin, A. S., Redmond, S., Reintsema, C., Romualdez, L. J., Ruhl, J. E., Runyan, M. C., Shariff, J. A., Shiu, C., Soler, J. D., Song, X., Tartakovsky, S., Thommesen, H., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., Ullom, J., van der List, J. F., Van Lanen, J., Vissers, M. R., Weber, A. C., Wen, S., Wehus, I. K., Wiebe, D. V., and Young, E. Y.

Published
2024
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22. 280 GHz Focal Plane Unit Design and Characterization for the Spider-2 Suborbital Polarimeter

Author

Bergman, A. S., primary, Ade, P. A. R., additional, Akers, S., additional, Amiri, M., additional, Austermann, J. A., additional, Beall, J. A., additional, Becker, D. T., additional, Benton, S. J., additional, Bock, J. J., additional, Bond, J. R., additional, Bryan, S. A., additional, Chiang, H. C., additional, Contaldi, C. R., additional, Domagalski, R. S, additional, Doré, O., additional, Duff, S. M., additional, Duivenvoorden, A. J., additional, Eriksen, H. K., additional, Farhang, M., additional, Filippini, J. P., additional, Fissel, L. M., additional, Fraisse, A. A., additional, Freese, K., additional, Galloway, M., additional, Gambrel, A. E., additional, Gandilo, N. N., additional, Ganga, K., additional, Grigorian, A., additional, Gualtieri, R., additional, Gudmundsson, J. E., additional, Halpern, M., additional, Hartley, J., additional, Hasselfield, M., additional, Hilton, G., additional, Holmes, W., additional, Hristov, V. V., additional, Huang, Z., additional, Hubmayr, J., additional, Irwin, K. D., additional, Jones, W. C., additional, Khan, A., additional, Kuo, C. L., additional, Kermish, Z. D., additional, Li, S., additional, Mason, P. V., additional, Megerian, K., additional, Moncelsi, L., additional, Morford, T. A., additional, Nagy, J. M., additional, Netterfield, C. B., additional, Nolta, M., additional, Osherson, B., additional, Padilla, I. L., additional, Racine, B., additional, Rahlin, A. S., additional, Redmond, S., additional, Reintsema, C., additional, Romualdez, L. J., additional, Ruhl, J. E., additional, Runyan, M. C., additional, Ruud, T. M., additional, Shariff, J. A., additional, Shaw, E. C., additional, Shiu, C., additional, Soler, J. D., additional, Song, X., additional, Trangsrud, A., additional, Tucker, C., additional, Tucker, R. S., additional, Turner, A. D., additional, Ullom, J., additional, van der List, J. F., additional, Van Lanen, J., additional, Vissers, M. R., additional, Weber, A. C., additional, Wehus, I. K., additional, Wen, S., additional, Wiebe, D. V., additional, and Young, E. Y., additional

Published
2018
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23. An Institution for Functional Literacy: Literacy House

Author

Shaw, E. C.

Abstract

Literacy House is an institution with an integrated program to promote functional literacy and to strengthen the movement of adult education in India, especially in rural areas. It is primarily a training center where new methods are thought out, tried, tested, developed and shared with agencies in the field. (EB)

Published
1971

24. 280 GHz Focal Plane Unit Design and Characterization for the SPIDER-2 Suborbital Polarimeter

Author

Bergman, A. S., Ade, P. A. R., Akers, S., Amiri, M., Austermann, J. A., Beall, J. A., Becker, D. T., Benton, S. J., Bock, J. J., Bond, J. R., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Domagalski, R. S., Dore, O., Duff, S. M., Duivenvoorden, Adri J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fissel, L. M., Fraisse, A. A., Freese, Katherine, Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Grigorian, A., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, J., Irwin, K. D., Jones, W. C., Khan, A., Kuo, C. L., Kermish, Z. D., Li, S., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Redmond, S., Reintsema, C., Romualdez, L. J., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., Ullom, J., van der List, J. F., Van Lanen, J., Vissers, M. R., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., Young, E. Y., Bergman, A. S., Ade, P. A. R., Akers, S., Amiri, M., Austermann, J. A., Beall, J. A., Becker, D. T., Benton, S. J., Bock, J. J., Bond, J. R., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Domagalski, R. S., Dore, O., Duff, S. M., Duivenvoorden, Adri J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fissel, L. M., Fraisse, A. A., Freese, Katherine, Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Grigorian, A., Gualtieri, R., Gudmundsson, Jón E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, J., Irwin, K. D., Jones, W. C., Khan, A., Kuo, C. L., Kermish, Z. D., Li, S., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Redmond, S., Reintsema, C., Romualdez, L. J., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, C., Tucker, R. S., Turner, A. D., Ullom, J., van der List, J. F., Van Lanen, J., Vissers, M. R., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V., and Young, E. Y.

Abstract

We describe the construction and characterization of the 280 GHz bolometric focal plane units (FPUs) to be deployed on the second flight of the balloon-borne SPIDER instrument. These FPUs are vital to SPIDER's primary science goal of detecting or placing an upper limit on the amplitude of the primordial gravitational wave signature in the cosmic microwave background (CMB) by constraining the B-mode contamination in the CMB from Galactic dust emission. Each 280 GHz focal plane contains a 16 x 16 grid of corrugated silicon feedhorns coupled to an array of aluminum-manganese transition-edge sensor (TES) bolometers fabricated on 150 mm diameter substrates. In total, the three 280 GHz FPUs contain 1530 polarization-sensitive bolometers (765 spatial pixels) optimized for the low loading environment in flight and read out by time-division SQUID multiplexing. In this paper, we describe the mechanical, thermal, and magnetic shielding architecture of the focal planes and present cryogenic measurements which characterize yield and the uniformity of several bolometer parameters. The assembled FPUs have high yields, with one array as high as 95% including defects from wiring and readout. We demonstrate high uniformity in device parameters, finding the median saturation power for each TES array to be similar to 3 pW at 300 mK with a less than 6% variation across each array at 1 sigma. These focal planes will be deployed alongside the 95 and 150 GHz telescopes in the SPIDER-2 instrument, slated to fly from McMurdo Station in Antarctica in December 2018.

Published
2018
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25. Tribology and Nanoindentation Study of Suspension HVOF Thermally Sprayed Alumina Coating

Author

Hussain, T., Shaw, E. C., Pala, Z., Xu, F., and Andrew SM Ang

Abstract

In this study, a water-based corundum suspension was used to deposit 60 μm alumina coatings onto carbon steel substrates by HVOF spraying. The aim was to develop thin coatings with superior wear properties. Hydrogen was used as a fuel gas and process parameters were varied to determine their effect on microstructure and properties. Coating microstructure was examined by SEM to assess particle melting and morphology and XRD was used to study the phase transformation of the feedstock suspension. At higher combustion flame energy, the coating transformed primarily to gamma alumina, while at lower energy, it was found to be a mixture of alpha and gamma alumina. Nanoindentation tests were used to measure the hardness and elastic modulus of individual phases. Ball-on-plate wear tests helped reveal the relationship between wear performance and the alpha-gamma ratios in the coatings.

Published
2016
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26. SOCIAL SECURITY ADMINISTRATION: Revision to the Government Pension Offset Exemption Should Be Considered

Author

GENERAL ACCOUNTING OFFICE WASHINGTON DC, Shaw, E. C., GENERAL ACCOUNTING OFFICE WASHINGTON DC, and Shaw, E. C.

Abstract

This report addresses your request for information on the Government Pension Offset (GPO) exemption. Generally, Social Security benefits are payable to the spouses of retired, disabled, or deceased workers covered by Social Security. These benefits often provide income to wives and husbands who have little or no Social Security benefits of their own. If both spouses worked in positions covered by Social Security, each may not receive both the benefits earned as a worker and the full spousal benefit; rather the worker receives the higher amount of the two. However, until 1977, workers receiving pensions from government positions not covered by Social Security could receive their full pension benefit and their full Social Security spousal benefits as if they were nonworking spouses. At that time, legislation was enacted' creating a GPO, to equalize the treatment of workers covered by Social Security and those with noncovered government pensions. The GPO prevented workers from receiving a full spousal benefit on top of a pension earned from noncovered government employment. However, the law provides an exemption from the GPO if an individual's last day of state/local employment is in a position that is covered by both Social Security and the state/local government pension system. In these cases, the GPO will not be applied to the Social Security spousal benefit. The intent of the "last- day" exemption is unclear in the legislation., "The original document contains color images"

Published
2002

29. Neurally mediated syncope: Pathogenesis, diagnosis, and treatment

Author

Kaufmann, H., Savage, D. D., Corwin, L., Mcgee, D. L., Gendelman, H. E., Linzer, M., Gabelman, M., Day, S. C., Cook, E. F., Funkenstein, H., Lewis, T., Ziegler, M. G., Lake, C. R., Kopin, I. J., Bannister, R., Sever, P., Gross, M., Oribe, E., Winters, S., Sneddon, J. F., Counihan, P. J., Bashir, Y., Boudoulas, H., Weissler, A. M., Lewis, R. P., Weiss, S., Baker, J. P., Dehn, T. C., Morley, C. A., Sutton, R., Mathias, C. J., Armstrong, E., Browse, N., Shaw, E. C., Young, H. H., Kapoor, W. N., Peterson, J. R., Karpf, M., Palmer, E. D., Mark, A. L., Abboud, F. M., Oberg, B., Thoren, P., Skarphedinsson, J. O., Carlsson, S., Jarisch, A., Zotterman, Y., Shalev, Y., Gal, R., Tchou, P. J., Scherrer, U., Vissing, S., Morgan, B. J., Fitzpatrick, A. P., Bannder, N., Cheng, A., Maloney, T. D., Jaeger, F. J., Fouad-Tarazi, F. M., Milstein, S., Buetikofer, J., Lesser, J., Sra, J. S., Jazayeri, M. R., Avitall, B., Barcroft, H., Edholm, O. G., Mcmichael, J., Sharpey-Shafer, E. P., Epstein, S. E., Stampfer, M., Beiser, D., Murray, R. H., Thompson, L. J., Bowers, J. A., Wallin, B. G., Sundlof, G., Westerberg, C. E., Sundloff, G., Burke, D., Wallin, G., Oliver, J. A., Miller, M., Glover, W. E., Greenfield, A. D. M., Shanks, R. G., Robinson, B. J., Johnson, R. H., Robertson, D., Johnson, G. A., Robertson, R. M., Palmer, R. M., Ashton, D. S., Moncada, S., Higgs, E. A., Bolotina, V., Najibi, S., Palacino, J., Tolins, J., Palmer, R. M. J., Berman, J., Kenny, R. A., Ingram, A., Bayliss, J., Fitzpatrick, A., Abi-Samra, F., Maloney, J. D., Fouad-Tarazi, F., Almquist, A., Goldenberg, I. F., Strasberg, B., Rechavia, E., Sagie, A., Raviele, A., Gasparini, G., Di Pede, F., Grubb, B. P., Temsey-Armos, P., Hahn, H., Michele Brignole, Menozzi, C., Gianfranchi, L., Anderson, A. J., Sheik, S. H., Sheldon, R., Killam, S., Waxman, M. B., Yao, L., Cameron, D. A., Brant, N., Micieli, G., Cavallini, A., Tasorelli, C., El-Bedawi, K. M., Hainsworth, R., Davies, I. B., Sever, P. S., Balaji, S., Oslizlok, P. C., Allen, M. C., Dacosta, D., Mcintosh, S., Thames, M. D., Abi Samra, F. M., Davison, N. M., Gardner, R. D., O Marcaigh, A. S., Maclellan-Tobert, S. G., Porter, C. J., Dangovian, M. I., Jarandilla, R., Frumin, H., Morillo, C. A., Leitch, J. W., Yee, R., Mclaran, C. J., Gersh, B. J., Osborn, M. J., Nelson, S., Stanley, M., Love, C., Susmano, A., Volgman, A. S., Buckingham, T. A., Strieper, M. J., Campbell, R., Wolfe, D., and Samoil, D.

30. Design and pre-flight performance of SPIDER 280 GHz receivers

Author

Zmuidzinas, Jonas, Gao, Jian-Rong, Shaw, E. C., Ade, P. A. R., Akers, S., Amiri, M., Austermann, Jason E., Beall, James A., Becker, D.T., Benton, S.J., Bergman, A. S., Bock, J.J., Bond, J.R., Bryan, S.A., Chiang, H.C., Contaldi, C.R., Domagalski, R.S., Dore, O., Duff, S. M., Duivenvoorden, A.J., Eriksen, H.K., Farhang, M., Filippini, J. P., Fissel, L.M., Fraisse, A.A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N.N., Ganga, K., Grigorian, A., Gualtieri, R, Gudmundsson, J.E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V.V., Huang, Z., Hubmayr, Johannes, Irwin, K.D., Jones, W.C., Kahn, A., Kuo, C.L., Kermish, Z.D., Lennox, A., Leung, J. S.-Y., Megerian, K., Reintsema, C., Li, S., Mason, P.V., Runyan, M. C., Moncelsi, L., Morford, T.A., Nagy, J.M., Nie, R., Mocanu, L. M., Padilla, I.L., Netterfield, C. B., Osherson, B., Rahlin, A.S., Redmond, S., Turner, A. D., Romualdez, L.J., Nolta, M., Ruhl, J.E., Shariff, J.A., Shiu, C., Soler, J.D., Song, X., Trangsrud, A., Thommesen, H., Tucker, C., Tucker, R.S., Ullom, Joel, van der List, J.F., Van Lanen, Jeff, Vissers, M. R., Weber, A. C., Wen, S., Wehus, I.K., Wiebe, D.V., Young, E.Y., Zmuidzinas, Jonas, Gao, Jian-Rong, Shaw, E. C., Ade, P. A. R., Akers, S., Amiri, M., Austermann, Jason E., Beall, James A., Becker, D.T., Benton, S.J., Bergman, A. S., Bock, J.J., Bond, J.R., Bryan, S.A., Chiang, H.C., Contaldi, C.R., Domagalski, R.S., Dore, O., Duff, S. M., Duivenvoorden, A.J., Eriksen, H.K., Farhang, M., Filippini, J. P., Fissel, L.M., Fraisse, A.A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N.N., Ganga, K., Grigorian, A., Gualtieri, R, Gudmundsson, J.E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V.V., Huang, Z., Hubmayr, Johannes, Irwin, K.D., Jones, W.C., Kahn, A., Kuo, C.L., Kermish, Z.D., Lennox, A., Leung, J. S.-Y., Megerian, K., Reintsema, C., Li, S., Mason, P.V., Runyan, M. C., Moncelsi, L., Morford, T.A., Nagy, J.M., Nie, R., Mocanu, L. M., Padilla, I.L., Netterfield, C. B., Osherson, B., Rahlin, A.S., Redmond, S., Turner, A. D., Romualdez, L.J., Nolta, M., Ruhl, J.E., Shariff, J.A., Shiu, C., Soler, J.D., Song, X., Trangsrud, A., Thommesen, H., Tucker, C., Tucker, R.S., Ullom, Joel, van der List, J.F., Van Lanen, Jeff, Vissers, M. R., Weber, A. C., Wen, S., Wehus, I.K., Wiebe, D.V., and Young, E.Y.

Abstract

In this work we describe upgrades to the Spider balloon-borne telescope in preparation for its second flight, currently planned for December 2021. The Spider instrument is optimized to search for a primordial B-mode polarization signature in the cosmic microwave background at degree angular scales. During its first flight in 2015, Spider mapped ~10% of the sky at 95 and 150 GHz. The payload for the second Antarctic flight will incorporate three new 280 GHz receivers alongside three refurbished 95- and 150 GHz receivers from Spider's first flight. In this work we discuss the design and characterization of these new receivers, which employ over 1500 feedhorn-coupled transition-edge sensors. We describe pre-flight laboratory measurements of detector properties, and the optical performance of completed receivers. These receivers will map a wide area of the sky at 280 GHz, providing new information on polarized Galactic dust emission that will help to separate it from the cosmological signal.

32. Clinical versus actuarial predictions of violence of patients with mental illnesses.

Author

Gardner W, Lidz CW, Mulvey EP, and Shaw EC

Subjects
Actuarial Analysis, Adolescent, Adult, Aged, Female, Follow-Up Studies, Humans, Male, Mental Disorders classification, Mental Disorders diagnosis, Middle Aged, Personality Assessment statistics & numerical data, Risk Factors, Violence prevention & control, Dangerous Behavior, Emergency Services, Psychiatric, Mental Disorders psychology, Violence psychology
Abstract

This study compared the accuracy of an actuarial procedure for the prediction of community violence by patients with mental illness with the accuracy of clinicians' ratings of concern about patients' violence. Data came from a study in which patients were followed in the community for 6 months after having been seen in a psychiatric emergency room. Accuracy of actuarial prediction was estimated retrospectively, with a statistical correction for capitalization on chance. Actuarial prediction had lower rates of false-positive and false-negative errors than clinical prediction. The seriousness of the violence correctly identified by the actuarial predictor (the true positives) was similar to the seriousness identified by clinicians. Actuarial predictions based only on patients' histories of violence were more accurate than clinical predictions, as were actuarial predictions that did not use information about histories.

Published
1996
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33. Regression analyses of counts and rates: Poisson, overdispersed Poisson, and negative binomial models.

Author

Gardner W, Mulvey EP, and Shaw EC

Subjects
Humans, Linear Models, Probability, Binomial Distribution, Data Collection, Data Interpretation, Statistical, Poisson Distribution, Regression Analysis
Abstract

The regression models appropriate for counted data have seen little use in psychology. This article describes problems that occur when ordinary linear regression is used to analyze count data and presents 3 alternative regression models. The simplest, the Poisson regression model, is likely to be misleading unless restrictive assumptions are met because individual counts are usually more variable ("overdispersed") than is implied by the model. This model can be modified in 2 ways to accomodate this problem. In the overdispersed model, a factor can be estimated that corrects the regression model's inferential statistics. In the second alternative, the negative binomial regression model, a random term reflecting unexplained between-subject differences is included in the regression model. The authors compare the advantages of these approaches.

Published
1995
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