Continuous adiabatic demagnetization refrigerator for the PRobe far-infrared mission for astrophysics (PRIMA)

Le résumé fourni par la source

The PRobe far-Infrared Mission for Astrophysics (PRIMA) contains two instruments: an imager (PRIMAGER) and a multiband spectrometer (FIRESS). These two instruments require detector cooling to 100 mK and require parts of the optical train to operate at 1.0 K. From a base temperature of 4.5 K, provided by a JWST-like cryocooler, a five-stage Continuous Adiabatic Demagnetization Refrigerator (CADR) will provide this cooling to both instruments. The PRIMA CADR is based on heritage parts from the Hitomi and the X-Ray Imaging and Spectroscopy Mission ADRs and from recent Strategic Astrophysics Technology–developed hardware. The CADR will provide 700 μW of lift at 1.0 K and 13 μW of lift at 120 mK to meet the two instruments’ (PRIMAger and FIRESS) cooling requirements with a factor of 2 margin. The CADR is designed to reject a maximum of 10 mW at the 4.5 K cryocooler heat sink. We will describe the CADR, its requirements, its operation, and its heritage.

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