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Proceedings Paper

Design of the two-stage series adiabatic demagnetization refrigerator for the NeXT and Spectrum-RG missions
Author(s): K. Shinozaki; K. Mitsuda; N. Y. Yamasaki; Y. Takei; M. DiPirro; Y. Ezoe; R. Fujimoto; J. W. den Herder; M. Hirabayashi; Y. Ishisaki; K. Kanao; M. Kawaharada; R. Kelley; C. Kilbourne; S. Kitamoto; D. McCammon; T. Mihara; M. Murakami; T. Nakagawa; T. Ohashi; F. S. Porter; Y. Satoh; P. Shirron; H. Sugita; T. Tamagawa; M. Tashiro; S. Yoshida
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Paper Abstract

The SXS (Soft X-ray Spectrometer) onboard the coming Japanese X-ray satellite NeXT (New Exploration Xray Telescope) and the SXC (Spectrum-RG X-ray Calorimeter) in Spectrum-RG mission are microcalorimeter array spectrometers which will achieve high spectral resolution of ~ 6 eV in 0.3-10.0 keV energy band. These spectrometers are well-suited to address key problems in high-energy astrophysics. To achieve these high spectral sensitivities, these detectors require to be operated under 50 mK by using very efficient cooling systems including adiabatic demagnetization refrigerator (ADR). For both missions, we propose a two-stage series ADR as a cooling system below 1 K, in which two units of ADR consists of magnetic cooling material, a superconducting magnet, and a heat switch are operated step by step. Three designs of the ADR are proposed for SXS/SXC. In all three designs, ADR can attain the required hold time of 23 hours at 50 mK and cooling power of 0.4μW with a low magnetic fields (1.5/1.5 Tesla or 2.0/3.0 Tesla) in a small configuration (180 mmφ× 319 mm in length). We also fabricated a new portable refrigerator for a technology investigation of two-stage ADR. Two units of ADR have been installed at the bottom of liquid He tank. By using this dewar, important technologies such as an operation of two-stage cooling cycle, tight temperature control less than 1 μK (in rms) stability, a magnetic shielding, saltpills, and gas-gap heat switches are evaluated.

Paper Details

Date Published: 15 July 2008
PDF: 9 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70113R (15 July 2008); doi: 10.1117/12.788634
Show Author Affiliations
K. Shinozaki, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
K. Mitsuda, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
N. Y. Yamasaki, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Y. Takei, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
M. DiPirro, NASA Goddard Space Flight Ctr. (United States)
Y. Ezoe, Tokyo Metropolitan Univ. (Japan)
R. Fujimoto, Kanazawa Univ. (Japan)
J. W. den Herder, SRON Netherlands Institute for Space Research (Netherlands)
M. Hirabayashi, Sumitomo Heavy Industries, Ltd. (Japan)
Y. Ishisaki, Tokyo Metropolitan Univ. (Japan)
K. Kanao, Sumitomo Heavy Industries, Ltd. (Japan)
M. Kawaharada, RIKEN (Japan)
R. Kelley, NASA Goddard Space Flight Ctr. (United States)
C. Kilbourne, NASA Goddard Space Flight Ctr. (United States)
S. Kitamoto, Rikkyo Univ. (Japan)
D. McCammon, Univ. of Wisconsin, Madison (United States)
T. Mihara, RIKEN (Japan)
M. Murakami, Univ. of Tsukuba (Japan)
T. Nakagawa, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
T. Ohashi, Tokyo Metropolitan Univ. (Japan)
F. S. Porter, NASA Goddard Space Flight Ctr. (United States)
Y. Satoh, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (Japan)
P. Shirron, NASA Goddard Space Flight Ctr. (United States)
H. Sugita, Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency (Japan)
T. Tamagawa, RIKEN (Japan)
M. Tashiro, Saitama Univ. (Japan)
S. Yoshida, Sumitomo Heavy Industries, Ltd. (Japan)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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