29 August 2017 The evaluation of the Hitomi (Astro-H)/SXS spare beryllium window in 3.8-30 keV
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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.
Conference Presentation
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Akio Hoshino, Akio Hoshino, Yuki Yoshida, Yuki Yoshida, Shunji Kitamoto, Shunji Kitamoto, Ryuichi Fujimoto, Ryuichi Fujimoto, Noriko Y. Yamasaki, Noriko Y. Yamasaki, Toshiaki Ina, Toshiaki Ina, Tomoya Uruga, Tomoya Uruga, Megan Eckart, Megan Eckart, Maurice Leutenegger, Maurice Leutenegger, } "The evaluation of the Hitomi (Astro-H)/SXS spare beryllium window in 3.8-30 keV", Proc. SPIE 10397, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XX, 103970E (29 August 2017); doi: 10.1117/12.2272899; https://doi.org/10.1117/12.2272899
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