Search

Your search keyword '"Zhang, William W."' showing total 70 results
Start Over Author "Zhang, William W." Publication Type Magazines
70 results on '"Zhang, William W."'

1. Curved detectors for future x-ray astrophysics missions

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Miller, Eric D., Gregory, James A., Bautz, Marshall W., Clark, Harry R., Cooper, Michael, Donlon, Kevan, Foster, Richard F., Grant, Catherine E., Jensen, Mallory, LaMarr, Beverly, Lambert, Renee, Leitz, Christopher, Malonis, Andrew, Neak, Mo, Prigozhin, Gregory, Ryu, Kevin, Schneider, Benjamin, Warner, Keith, Young, Douglas J., and Zhang, William W.

Published
2024
Full Text
View/download PDF

2. Mirror design for the high-energy x-ray probe (HEX-P)

Author

O'Dell, Stephen L., Gaskin, Jessica A., Pareschi, Giovanni, Spiga, Daniele, Madsen, Kristin K., Corsetti, James, Kenyon, Steven, Okajima, Takashi, Rohrback, Scott, Tamura, Keisuke, Zhang, William W., Gurgew, Danielle N., Christensen, Finn Erland, Ferreira, Desiree Della Monica, Gellert, Nis Christian, Massahi, Sonny, Basso, Stefano, Pareschi, Giovanni, Moretti, Alberto, Spiga, Daniele, Valsecchi, Giuseppe, Vernani, Dervis, and Stern, Daniel K.

Published
2023
Full Text
View/download PDF

4. Overview of the advanced x-ray imaging satellite (AXIS)

Author

Siegmund, Oswald H., Hoadley, Keri, Reynolds, Christopher S., Kara, Erin A., Mushotzky, Richard F., Ptak, Andrew, Koss, Michael J., Williams, Brian J., Allen, Steven W., Bauer, Franz E., Bautz, Marshall, Bogadhee, Arash, Burdge, Kevin B., Cappelluti, Nico, Cenko, Brad, Chartas, George, Chan, Kai-Wing, Corrales, Lía, Daylan, Tansu, Falcone, Abraham D., Foord, Adi, Grant, Catherine E., Habouzit, Mélanie, Haggard, Daryl, Herrmann, Sven, Hodges-Kluck, Edmund, Kargaltsev, Oleg, King, George W., Kounkel, Marina, Lopez, Laura A., Marchesi, Stefano, McDonald, Michael, Meyer, Eileen, Miller, Eric D., Nynka, Melania, Okajima, Takashi, Pacucci, Fabio, Russell, Helen R., Safi-Harb, Samar, Strassun, Keivan G., Trindade Falcão, Anna, Walker, Stephen A., Wilms, Joern, Yukita, Mihoko, and Zhang, William W.

Published
2023
Full Text
View/download PDF

5. The high-energy x-ray probe (HEX-P)

Author

Siegmund, Oswald H., Hoadley, Keri, Morrissey, Patrick, Madsen, Kristin, Amini, Rashied, Dawson, Douglas, Grefenstette, Brian, Abramovici, Alex, Bandyopadhyay, Saptarshi, Casadesus Vila, Guillem, Franklin, Steve, Johnson, William, Kedar, Sharon, Lane, Marc, Lee, Karen, Smith, Miles, Stern, Daniel, Zusack, Steven, Arenberg, Jonathan, McEachen, Mike, McCreary, Lance, Rodgers, Jeff, Coutinho, Diogo, Müeller-Seidlitz, Johannes, Nandra, Kirpal, Predehl, Peter, Strecker, Rafael, Dauner, Lea, Kenyon, Steve, Markie, Paul, Zhang, William W., Basso, Stefano, Moretti, Alberto, Pareschi, Giovanni, Spiga, Daniele, Valsecchi, Giuseppe, and Vernani, Dervis

Published
2023
Full Text
View/download PDF

8. Overview of the Advanced X-ray Imaging Satellite (AXIS)

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Reynolds, Christopher S., Miller, Eric D., Hodges-Kluck, Edmund, Koss, Michael J., Williams, Brian J., Kara, Erin A., Ptak, Andrew, Mushotzky, Richard F., Allen, Steven W., Bauer, Franz E., Bautz, Marshall, Bodaghee, Arash, Burdge, Kevin B., Cappelluti, Nico, Cenko, Brad, Chartas, George, Chan, Kai-wing, Corrales, Lía, Daylan, Tansu, Falcone, Abraham D., Foord, Adi, Grant, Catherine E., Habouzit, Mélanie, Haggard, Daryl, Herrmann, Sven, Kargaltsev, Oleg, King, George W., Kounkel, Marina, Lopez, Laura A., Marchesi, Stefano, McDonald, Michael, Meyer, Eileen, Nynka, Melania, Okajima, Takashi, Pacucci, Fabio, Russell, Helen R., Safi-Harb, Samar, Stassun, Keivan G., Falcão, Anna Trindade, Walker, Stephen A., Wilms, Joern, Yukita, Mihoko, and Zhang, William W.

Published
2024
Full Text
View/download PDF

9. Optical design of type-1 x-ray telescopes and their application to STAR-X

Author

Saha, Timo T. and Zhang, William W.

Abstract

An astronomical x-ray telescope’s capability rests on the quality of its optics, which in turn rests on its point spread function (PSF), field of view (FOV), and photon-collecting area. The design and implementation of telescope optics must optimize these three parameters in the context of mathematical prescription, optical fabrication, engineering, and resources such as mass and cost constraints. In this paper, after reviewing important features of grazing incidence optics and the many different mathematical prescriptions in the literature, we quantitatively compare the advantages and disadvantages of these prescriptions, using detailed ray trace, to optimize the PSF and FOV for a given set of requirements. Then, we apply this approach to optimizing the designs for a proposed future x-ray telescope, Survey and Time-Domain Astrophysical Research eXplorer (STAR-X), a NASA Medium-Class (MIDEX) mission by optimizing the combination of PSF and FOV.

Published
2022

10. The Globe Orbiting Soft X-ray (GOSoX) polarimeter concept study

Author

O'Dell, Stephen L., Gaskin, Jessica A., Pareschi, Giovanni, Marshall, Herman L., Heine, Sarah N. T., Davidson, Rosemary, Garner, Alan, Gullikson, Eric M., Günther, H. Moritz, Leitz, Christopher, Masterson, Rebecca, Miller, Eric D., Stenzel, June S., Zhang, William W., Boissay-Malaquin, Rozenn, Caiazzo, Ilaria, Chakrabarty, Deepto, Gallo, Luigi G., Heilmann, Ralf K., Heyl, Jeremy, Kara, Erin, and Schulz, Norbert S.

Published
2021
Full Text
View/download PDF

15. The Off-plane Grating Rocket Experiment (OGRE) system overview

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Tutt, James H., McEntaffer, Randall L., Donovan, Benjamin, Schultz, Ted B., Biskach, Michael P., Chan, Kai-Wing, Kearney, John D., Mazzarella, James R., McClelland, Ryan S., Riveros, Raul E., Saha, Timo T., Hlinka, Michal, Zhang, William W., Soman, Matthew R., Holland, Andrew D., Lewis, Matthew R., Holland, Karen, and Murray, Neil J.

Published
2018
Full Text
View/download PDF

16. Optical design of the Off-plane Grating Rocket Experiment

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Donovan, Benjamin D., McEntaffer, Randall L., Tutt, James H., Schultz, Ted B., Biskach, Michael P., Chan, Kai-Wing, Hlinka, Michal, Kearney, John D., Mazzarella, James R., McClelland, Ryan S., Riveros, Raul E., Saha, Timo T., Zhang, William W., Holland, Andrew D., Lewis, Matthew R., Soman, Matthew R., Holland, Karen, and Murray, Neil J.

Published
2018
Full Text
View/download PDF

20. Lynx Mission concept status

Author

Siegmund, Oswald H., Gaskin, Jessica A., Allured, Ryan, Bandler, Simon R., Basso, Stefano, Bautz, Marshall W., Baysinger, Michael F., Biskach, Michael P., Boswell, Tyrone M., Capizzo, Peter D., Chan, Kai-Wing, Civitani, Marta M., Cohen, Lester M., Cotroneo, Vincenzo, Davis, Jacqueline M., DeRoo, Casey T., DiPirro, Michael J., Dominguez, Alexandra, Fabisinski, Leo L., Falcone, Abraham D., Figueroa-Feliciano, Enectali, Garcia, Jay C., Gelmis, Karen E., Heilmann, Ralf K., Hopkins, Randall C., Jackson, Thomas, Kilaru, Kiranmayee, Kraft, Ralph P., Liu, Tianning, McClelland, Ryan S., McEntaffer, Randy L., McCarley, Kevin S., Mulqueen, John A., Özel, Feryal, Pareschi, Giovanni, Reid, Paul B., Riveros, Raul E., Rodriguez, Mitchell A., Rowe, Justin W., Saha, Timo T., Schattenburg, Mark L., Schnell, Andrew R., Schwartz, Daniel A., Solly, Peter M., Suggs, Robert M., Sutherlin, Steven G., Swartz, Douglas A., Trolier-McKinstry, Susan, Tutt, James H., Vikhlinin, Alexey, Walker, Julian, Yoon, Wonsik, and Zhang, William W.

Published
2017
Full Text
View/download PDF

32. Aligning, bonding, and testing mirrors for lightweight x-ray telescopes

Author

O'Dell, Stephen L., Pareschi, Giovanni, Chan, Kai-Wing, Zhang, William W., Saha, Timo T., McClelland, Ryan S., Biskach, Michael P., Niemeyer, Jason, Schofield, Mark J., Mazzarella, James R., Kolos, Linette D., Hong, Melinda M., Numata, Ai, Sharpe, Marton V., Solly, Peter M., Riveros, Raul E., Allgood, Kim D., and McKeon, Kevin P.

Published
2015
Full Text
View/download PDF

33. A broadband x-ray imaging spectroscopy in the 2030s: the FORCE mission

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Mori, Koji, Tsuru, Takeshi G., Nakazawa, Kazuhiro, Ueda, Yoshihiro, Watanabe, Shin, Tanaka, Takaaki, Ishida, Manabu, Matsumoto, Hironori, Awaki, Hisamitsu, Murakami, Hiroshi, Nobukawa, Masayoshi, Takeda, Ayaki, Fukazawa, Yasushi, Tsunemi, Hiroshi, Takahashi, Tadayuki, Hornschemeier, Ann, Okajima, Takashi, Zhang, William W., Williams, Brian J., Venters, Tonia, Madsen, Kristin, Yukita, Mihoko, Akamatsu, Hiroki, Bamba, Aya, Enoto, Teruaki, Fujita, Yutaka, Furuzawa, Akihiro, Hagino, Kouichi, Ishimura, Kosei, Itoh, Masayuki, Kitayama, Tetsu, Kobayashi, Shogo, Kohmura, Takayoshi, Kubota, Aya, Mizumoto, Misaki, Mizuno, Tsunefumi, Nakajima, Hiroshi, Nobukawa, Kumiko K., Noda, Hirofumi, Odaka, Hirokazu, Ota, Naomi, Sato, Toshiki, Shidatsu, Megumi, Suzuki, Hiromasa, Takahashi, Hiromitsu, Tanimoto, Atsushi, Terada, Yukikatsu, Terashima, Yuichi, Uchida, Hiroyuki, Uchiyama, Yasunobu, Yamaguchi, Hiroya, and Yatsu, Yoichi

Published
2022
Full Text
View/download PDF

36. The nuclear spectroscopic telescope array (NuSTAR) high-energy X-ray mission

Author

Takahashi, Tadayuki, den Herder, Jan-Willem A., Bautz, Mark, Madsen, Kristin K., Harrison, Fiona A., An, Hongjun, Boggs, Steven E., Christensen, Finn E., Cook, Rick, Craig, William W., Forster, Karl, Fuerst, Felix, Grefenstette, Brian, Hailey, Charles J., Kitaguchi, Takao, Markwardt, Craig, Mao, Peter, Miyasaka, Hiromasa, Rana, Vikram R., Stern, Daniel K., Zhang, William W., Zoglauer, Andreas, Walton, Dominic, and Westergaard, Niels J.

Published
2014
Full Text
View/download PDF

41. The Warm-Hot Intergalactic Medium Explorer (WHIMex) mission

Author

Lillie, Charles F., Cash, Webster C., McEntaffer, Randall L., Zhang, William W., O'Dell, Stephen L., Bautz, Mark W., and Elvis, Martin S.

Abstract

The WHIMex X-ray observatory will provide an order of magnitude improvement in sensitivity and spectroscopic resolution, ushering in a new era in astrophysics. With resolution ≥ 4,000 and collecting area 250 cm2in the 0.2- 0.8 keV band, WHIMex will greatly extend the spectroscopic discoveries of Chandra and XMM with a low-cost, highly-productive Explorer mission. WHIMex's spectra will provide a wealth of new information on the physical conditions of baryonic matter from the local regions of our Galaxy out to the Cosmic Web and the large-scale structures of the Universe. This baryonic matter is thought to result from gravitational collapse of moderately over-dense, dark-matter filaments of the Cosmic Web. The chemical enrichment of the Cosmic Web appears to arise from galactic super winds and early generations of massive stars. WHIMex will test these theories, distinguish between competing models, and provide new insights into galaxy evolution and the structure of the universe High-resolution X-ray spectroscopy was identified by the ASTRO 2010 decadal survey as a high-priority capability in the coming decade for a wide variety of science goals. Unfortunately, no other planned mission can address this science until IXO flies, no earlier than the late 2020s. WHIMex achieves its high level of performance in a single-instrument, affordable package using X-ray optical technologies developed for IXO and NuSTAR by academic, industrial and government research centers. The technology readiness levels of all the components are high. We plan to build an optical test module and raise the optical system readiness to TRL 6 during Phase A.

Published
2011
Full Text
View/download PDF

42. Toward active x-ray telescopes

Author

O'Dell, Stephen L., Atkins, Carolyn, Button, Timothy W., Cotroneo, Vincenzo, Davis, William N., Doel, Peter, Feldman, Charlotte H., Freeman, Mark D., Gubarev, Mikhail V., Kolodziejczak, Jeffery J., Michette, Alan G., Ramsey, Brian D., Reid, Paul B., Rodriguez Sanmartin, Daniel, Saha, Timo T., Schwartz, Daniel A., Trolier-McKinstry, Susan, Wilke, Rudeger H. T., Willingale, Richard, and Zhang, William W.

Abstract

Future x-ray observatories will require high-resolution (< 1") optics with very-large-aperture (> 25 m2) areas. Even with the next generation of heavy-lift launch vehicles, launch-mass constraints and aperture-area requirements will limit the areal density of the grazing-incidence mirrors to about 1 kg/m2or less. Achieving sub-arcsecond x-ray imaging with such lightweight mirrors will require excellent mirror surfaces, precise and stable alignment, and exceptional stiffness or deformation compensation. Attaining and maintaining alignment and figure control will likely involve active (in-space adjustable) x-ray optics. In contrast with infrared and visible astronomy, active optics for x-ray astronomy is in its infancy. In the middle of the past decade, two efforts began to advance technologies for adaptive x-ray telescopes: The Smart X-ray Optics (SXO) Basic Technology project in the United Kingdom (UK) and the Generation-X (Gen-X) concept studies in the United States (US). This paper discusses relevant technological issues and summarizes progress toward active x-ray telescopes.

Published
2011
Full Text
View/download PDF

43. Design and analysis of mirror modules for IXO and beyond

Author

McClelland, Ryan S., Powell, Cory, Saha, Timo T., and Zhang, William W.

Abstract

Advancements in X-ray astronomy demand thin, light, and closely packed thin optics which lend themselves to segmentation of the annular mirrors and, in turn, a modular approach to the mirror design. The functionality requirements of such a mirror module are well understood. A baseline modular concept for the proposed International X-Ray Observatory (IXO) Flight Mirror Assembly (FMA) consisting of 14,000 glass mirror segments divided into 60 modules was developed and extensively analyzed. Through this development, our understanding of module loads, mirror stress, thermal performance, and gravity distortion have greatly progressed. The latest progress in each of these areas is discussed herein. Gravity distortion during horizontal X-ray testing and on-orbit thermal performance have proved especially difficult design challenges. In light of these challenges, fundamental trades in modular X-ray mirror design have been performed. Future directions in module X-ray mirror design are explored including the development of a 1.8 m diameter FMA utilizing smaller mirror modules. The effect of module size on mirror stress, module selfweight distortion, thermal control, and range of segment sizes required is explored with advantages demonstrated from smaller module size in most cases.

Published
2011
Full Text
View/download PDF

44. Fabrication of the NuSTAR flight optics

Author

Craig, William W., An, HongJun, Blaedel, Kenneth L., Christensen, Finn E., Decker, Todd A., Fabricant, Anne, Gum, Jeff, Hailey, Charles J., Hale, Layton, Jensen, Carsten B., Koglin, Jason E., Mori, Kaya, Nynka, Melanie, Pivovaroff, Michael J., Sharpe, Marton V., Stern, Marcela, Tajiri, Gordon, and Zhang, William W.

Abstract

We describe the fabrication of the two NuSTAR flight optics modules. The NuSTAR optics modules are glass-graphiteepoxy composite structures to be employed for the first time in space-based X-ray optics by NuSTAR, a NASA Small Explorer schedule for launch in February 2012. We discuss the optics manufacturing process, the qualification and environmental testing performed, and briefly discuss the results of X-ray performance testing of the two modules. The integration and alignment of the completed flight optics modules into the NuSTAR instrument is described as are the optics module thermal shields.

Published
2011
Full Text
View/download PDF

45. First results from the ground calibration of the NuSTAR flight optics

Author

Koglin, Jason E., An, HongJun, Barrière, Nicolas, Brejnholt, Nicolai F., Christensen, Finn E., Craig, William W., Hailey, Charles J., Jakobsen, Anders Clemen, Madsen, Kristin K., Mori, Kaya, Nynka, Melania, Fernandez-Perea, Monica, Pivovaroff, Michael J., Ptak, Andrew, Sleator, Clio, Thornhill, Doug, Vogel, Julia K., Wik, Daniel R., and Zhang, William W.

Abstract

NuSTAR is a hard X-ray satellite experiment to be launched in 2012. Two optics with 10.15 m focal length focus Xrays with energies between 5 and 80 keV onto CdZnTe detectors located at the end of a deployable mast. The FM1 and FM2 flight optics were built at the same time based on the same design and with very similar components, and thus the performance of both is expected to be very similar. We provide an overview of calibration data that is being used to build an optics response model for each optic and describe initial results for energies above 10 keV from the ground calibration of the flight optics. From a preliminary analysis of the data, our current best determination of the overall HPD of both the FM1 and FM2 flight optics is 52", and nearly independent of energy. The statistical error is negligible, and a preliminary estimate of the systematic error is of order 4". The as-measured effective area and HPD meet the toplevel NuSTAR mission sensitivity requirements.

Published
2011
Full Text
View/download PDF

50. A comprehensive line spread function error budget for the Off-plane Grating Rocket Experiment

Author

O'Dell, Stephen L., Pareschi, Giovanni, Donovan, Benjamin D., McEntaffer, Randall L., Tutt, James H., O'Meara, Bridget C., Grisé, Fabien, Allgood, Kim A., Biskach, Michael P., Chan, Kai-Wing, Hlinka, Michal, Kearney, John D., Mazzarella, James R., McClelland, Ryan S., Numata, Ai, Riveros, Raul E., Saha, Timo T., Solly, Peter M., Zhang, William W., Holland, Andrew D., Lewis, Matthew R., Soman, Matthew R., and Holland, Karen

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results