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Conception et performance prévisionnelle du réfrigérateur à démagnétisation adiabatique (RDA) pour le spectromètre Soft-X-ray embarqué sur l'Astro-H.

Design and predicted performance of the 3-stage ADR for the Soft-X-ray Spectrometer instrument on Astro-H.

Auteurs : SHIRRON P. J., KIMBALL M. O, JAMES B. L., et al.

Type d'article : Article

Résumé

The Japanese Astro-H mission will include the Soft X-ray Spectrometer (SXS) instrument provided by NASA/GSFC. The SXS will perform imaging spectroscopy in the soft X-ray band using a 6 _ 6 array of silicon microcalorimeters operated at 50 mK. The detectors will be cooled by a 3-stage adiabatic demagnetization refrigerator (ADR). The configuration allows the ADR to operate with both a 1.3 K superfluid helium bath and a 4.5 K cryocooler as its heat sink. Initially, when liquid helium is present, the two coldest stages of the ADR will operate in a single-shot mode to cool the detectors from 1.3 K. During this phase of the mission, the 3rd stage may be used to reduce the net heat load on the liquid helium and extend its lifetime. When the liquid is depleted, the 2nd and 3rd stages will operate in a continuous mode to maintain the helium tank at about 1.3 K, allowing continued operation of the 1st stage (in a single-shot mode) and hence the SXS instrument. This paper describes the design and operating modes of the ADR, as well as details of critical components. [Reprinted with permission from Elsevier. Copyright, 2012].

Détails

  • Titre original : Design and predicted performance of the 3-stage ADR for the Soft-X-ray Spectrometer instrument on Astro-H.
  • Identifiant de la fiche : 30003983
  • Langues : Anglais
  • Source : Cryogenics - vol. 52 - n. 4-6
  • Date d'édition : 04/2012
  • DOI : http://dx.doi.org/10.1016/j.cryogenics.2012.01.019

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