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Bouchon poreux et suppresseur d'écoulement d'un film d'hélium superfluide pour le spectromètre à rayons X doux à bord de l'Astro-H.

Porous plug and superfluid helium film flow suppressor for the soft X-ray spectrometer onboard Astro-H.

Auteurs : ISHIKAWA K., EZOE Y., YAMAGUCHI H., et al.

Résumé

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, the authors describe the principle and design of these four devices. [Reprinted with permission from Elsevier. Copyright, 2010].

Détails

  • Titre original : Porous plug and superfluid helium film flow suppressor for the soft X-ray spectrometer onboard Astro-H.
  • Identifiant de la fiche : 2010-1730
  • Langues : Anglais
  • Source : 2009 Space Cryogenics Workshop, Arcadia, USA, June 23-25.
  • Date d'édition : 09/2010
  • DOI : http://dx.doi.org/10.1016/j.cryogenics.2010.02.008

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