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Développement d'un séparateur de phase à bouchon poreux et d'un système de suppression de l'écoulement pelliculaire superfluide pour le spectromètre Soft-X-ray embarqué à bord de l'ASTRO-H.

Development of porous plug phase separator and superfluid film flow suppression system for the Soft X-ray Spectrometer onboard ASTRO-H.

Auteurs : EZOE Y., ISHIKAWA K., OHASHI T., et al.

Type d'article : Article

Résumé

ASTRO-H is the sixth Japanese astronomy satellite scheduled for launch in 2014. The Soft X-ray Spectrometer instrument is onboard ASTRO-H. This is a 6 x 6 array of X-ray microcalorimeters with an energy resolution of <7 eV at 0.5–10 keV. Superfluid liquid helium is utilized as a part of the cooling system. To retain the liquid helium in the tank under zero-gravity, a porous plug phase separator made of sintered stainless is used. Since the vapor mass flow rate is only 29 µg/s, any additional superfluid film loss influences the lifetime of the liquid helium. Therefore, a film flow suppression system consisting of an orifice, a heat exchanger, and knife edge devices is adopted based on the design used for the X-ray Spectrometer onboard Suzaku. The film flow will be suppressed to <2 µg/s, sufficiently smaller than the vapor flow rate. In the present investigation, the design and ground experiments of a helium vent system composed of the porous plug and film flow suppression system are presented. The results show that the phase separation and the film flow suppression are satisfactorily achieved. [Reprinted with permission from Elsevier. Copyright, 2012].

Détails

  • Titre original : Development of porous plug phase separator and superfluid film flow suppression system for the Soft X-ray Spectrometer onboard ASTRO-H.
  • Identifiant de la fiche : 30003988
  • Langues : Anglais
  • Source : Cryogenics - vol. 52 - n. 4-6
  • Date d'édition : 04/2012
  • DOI : http://dx.doi.org/10.1016/j.cryogenics.2012.01.024

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