کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1507355 | 1511048 | 2014 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development status of the mechanical cryocoolers for the Soft X-ray Spectrometer on board Astro-H
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Astro-H is the Japanese X-ray astronomy satellite to be launched in 2015. The Soft X-ray Spectrometer (SXS) on board Astro-H is a high energy resolution spectrometer utilizing an X-ray micro-calorimeter array, which is operated at 50Â mK by the ADR with the 30Â liter superfluid liquid helium. The mechanical cryocoolers, 4Â K-class Joule Thomson (JT) cooler and 20Â K-class double-staged Stirling (2ST) cooler, are key components of the SXS cooling system to extend the lifetime of LHe cryogen beyond 3Â years as required. Higher reliability was therefore investigated with higher cooling capability based on the heritage of existing cryocoolers. As the task of assessing further reliability dealt with the pipe-choking phenomena by contaminant solidification of the on-orbit SMILES JT cryocooler, outgassing from materials and component parts used in the cryocoolers was measured quantitatively to verify the suppression of carbon dioxide gas by their storage process and predict the total accumulated carbon dioxide for long-term operation. A continuous running test to verify lifetime using the engineering model (EM) of the 4Â K-JT cooler is underway, having operated for a total of 720Â days as of June 2013 and showing no remarkable change in cooling performance. During the current development phase, prototype models (PM) of the cryocoolers were installed to the test SXS dewar (EM) to verify the overall cooling performance from room temperature to 50Â mK. During the EM dewar test, the requirement to reduce the transmitted vibration from the 2ST cooler compressor was recognized as mitigating the thermal instability of the SXS microcalorimeter at 50Â mK.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cryogenics - Volume 64, NovemberâDecember 2014, Pages 182-188
Journal: Cryogenics - Volume 64, NovemberâDecember 2014, Pages 182-188
نویسندگان
Yoichi Sato, Kenichiro Sawada, Keisuke Shinozaki, Hiroyuki Sugita, Toshiyuki Nishibori, Ryota Sato, Kazuhisa Mitsuda, Noriko Y. Yamasaki, Yoh Takei, Ken Goto, Takao Nakagawa, Ryuichi Fujimoto, Kenichi Kikuchi, Masahide Murakami, Shoji Tsunematsu,