18 July 2016 Porous plug phase separator and superfluid film flow suppression system for the soft x-ray spectrometer onboard ASTRO-H
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Abstract
Suppression of super fluid helium flow is critical for the Soft X-ray Spectrometer onboard ASTRO-H (Hitomi). In nominal operation, a small helium gas flow of ~30 μg/s must be safely vented and a super fluid film flow must be sufficiently small <2 μg/s. To achieve a life time of the liquid helium, a porous plug phase separator and a film flow suppression system composed of an orifice, a heat exchanger, and knife edge devices are employed. In this paper, design, on-ground testing results and in-orbit performance of the porous plug and the film flow suppression system are described.
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Yuichiro Ezoe, Kumi Ishikawa, Ikuyuki Mitsuishi, Takaya Ohashi, Kazuhisa Mitsuda, Ryuichi Fujimoto, Masahide Murakami, Kenichi Kanao, Seiji Yoshida, Shoji Tsunematsu, Michael DiPirro, Peter Shirron, "Porous plug phase separator and superfluid film flow suppression system for the soft x-ray spectrometer onboard ASTRO-H", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99053P (18 July 2016); doi: 10.1117/12.2231968; https://doi.org/10.1117/12.2231968
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