2016
DOI: 10.1016/j.cryogenics.2015.10.011
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Thermodynamic performance of the 3-stage ADR for the Astro-H Soft-X-ray Spectrometer instrument

Abstract: The Soft X-ray Spectrometer (SXS) instrument [1] on Astro-H[2] will use a 3-stage ADR [3] to cool the microcalorimeter array to 50 mK. In the primary operating mode, two stages of the ADR cool the detectors using superfluid helium at ≤1.20 K as the heat sink [4]. In the secondary mode, which is activated when the liquid helium is depleted, the ADR uses a 4.5 K Joule-Thomson cooler as its heat sink. In this mode, all three stages operate together to continuously cool the (empty) helium tank and singleshot cool … Show more

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Cited by 11 publications
(11 citation statements)
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“…A detailed thermodynamic analysis of the SXS ADR has been published previously. 9,15 In this discussion, only a top-level summary is provided. When stage 1 is demagnetized, as described in the previous section, from 0.75 K and a magnetic field of 2 T (averaged over the volume of the salt pill), the theoretical cooling capacity at 50 mK is 0.165 J.…”
Section: Adiabatic Demagnetization Refrigerator Cooling Capacities Anmentioning
confidence: 99%
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“…A detailed thermodynamic analysis of the SXS ADR has been published previously. 9,15 In this discussion, only a top-level summary is provided. When stage 1 is demagnetized, as described in the previous section, from 0.75 K and a magnetic field of 2 T (averaged over the volume of the salt pill), the theoretical cooling capacity at 50 mK is 0.165 J.…”
Section: Adiabatic Demagnetization Refrigerator Cooling Capacities Anmentioning
confidence: 99%
“…By this method, the cooling capacity of stage 1 at 50 mK was determined to be 0.132 J, or 84% of the theoretical capacity. 15 Once the heat absorption efficiency was determined, both salt temperature and heat load could be inferred for any subsequent ADR cycle by fitting the magnet current as a function of time during the 50 mK hold to calculated values that would produce a constant increase in entropy. 14 This analysis consistently yielded a salt temperature of 48.5 mK.…”
Section: Adiabatic Demagnetization Refrigerator Cooling Capacities Anmentioning
confidence: 99%
“…architecture of the Hitomi ADR 1,31 . The ADR crystal is suspended in the bore of a NbTi coil by Kevlar crosses at each end of the mandrel.…”
Section: Stagementioning
confidence: 99%
“…Averaging over the 48-hour interval between recycles gives a time-average heat load to the liquid helium of 0.067 mW. During the ground test campaign for the SXS instrument, a thermodynamic model of the ADR 14 was constructed so that the heat generation rate as a function of time could be calculated. The original purpose was to determine the timeaverage heat load from the ADR in order to verify it met the requirement of <0.20 mW (see Table 1), but it also provided a mechanism for mass gauging the helium tank during the mission.…”
Section: Liquid Mass Gauging Using Heat Rejected From the Adrmentioning
confidence: 99%