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Proceedings Paper

The evaluation of the Hitomi (Astro-H)/SXS spare beryllium window in 3.8-30 keV
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Paper Abstract

During the Hitomi (Astro-H) commissioning observations the SXS dewar gate valve (GV) remained closed to protect the instrument from initial spacecraft outgassing. As a result, the optical path of the observations included the Be window installed on the GV. Both x-ray fluorescence (XRF) analysis and x-ray transmission measurements were performed in June 2016 on the flight-spare Be window which is the same lot as the flight material at SPring-8 in Japan. The beamline operating range is 3.8 - 30 keV. We used a beam spot size of 1 mm × 0.2 mm to measure two positions on the Be window, at the center of the window and at one position 6.5 mm off-center. We used simultaneous transmission measurements of standard materials for energy calibration. The transmission data clearly showed Fe and Ni K-edges, plus a marginal detection of the Mn K-edge. We found that our transmission data was best fit using the following component Be: 261.86±0.01μm, Cr: 3nm (fixed), Mn: 3.81±0.05nm, Fe: 10.83±0.05nm, Ni: 16.48±0.03nm, Cu: 5nm (fixed). The transmission is reduced 1% at the Fe K-edge. The amount of contaminated materials are comparable to the values of the value provided by the vender. The surface transmission is strained with σ = 0.11% of the unbiased standard deviation calculated variation in the residuals between the measured value and the model.

Paper Details

Date Published: 29 August 2017
PDF: 11 pages
Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 103970E (29 August 2017); doi: 10.1117/12.2272899
Show Author Affiliations
Akio Hoshino, Rikkyo Univ. (Japan)
Yuki Yoshida, Rikkyo Univ. (Japan)
Shunji Kitamoto, Rikkyo Univ. (Japan)
Ryuichi Fujimoto, Kanazawa Univ. (Japan)
Noriko Y. Yamasaki, Institute of Space and Astronautical Science (Japan)
Toshiaki Ina, Japan Synchrotron Radiation Research Institute (Japan)
Tomoya Uruga, Japan Synchrotron Radiation Research Institute (Japan)
Megan Eckart, NASA Goddard Space Flight Ctr. (United States)
Maurice Leutenegger, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 10397:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX
Oswald H. Siegmund, Editor(s)

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