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Porous plug and superfluid helium film flow suppressor for the soft X-ray spectrometer onboard Astro-H |
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| Authors: | Kumi Ishikawa Yuichiro Ezoe Ikuyuki Mitsuishi Kazuhisa Mitsuda Takaya Ohashi Ken-ichi Kanao Shoji Tsunematsu Peter Shirron The SXS team |
| Affiliation: | a Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan b RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan c Insitutue of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan d Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan e University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan f Sumitomo Heavy Industries, Ltd., 5-2 Soubiraki-cho, Niihama, Ehime 792-8588, Japan g NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA |
| Abstract: | Suppression of superfluid helium flow is critical for the Soft X-ray Spectrometer (SXS) onboard Astro-H, to achieve a life time of the liquid helium over 5 years. The superfluid film flow must be sufficiently small, compared to a nominal helium gas flow rate of the SXS  . For this purpose, four devices composed of a porous plug, an orifice, a heat exchanger, and knife edge devices will be employed based on the experience of the X-ray microcalorimeter (XRS for X-Ray Spectrometer) onboard Suzaku. The porous plug is a phase separator of the liquid and gas helium. A potential film flow leaking from the porous plug is suppressed by the orifice. Almost all the remaining film flow evaporates at the heat exchanger. The knife edge devices stop the remaining film flow by using atomically sharp edges. In this paper, we describe the principle and design of these four devices. |
| Keywords: | X-ray microcalorimeter Superfluid helium Vent system |
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