CEC-ICMC 2019 - Abstracts, Timetable and Presentations

C4Or1A-02: Status report on the performance of a flight-worthy 4 – 10 K Adiabatic Demagnetization Refrigerator for use in a 50 mK to 10 K Continuous Adiabatic Demagnetization Refrigerator

25 Jul 2019, 09:45

15m

Level 6, Room 26-27

Contributed Oral Presentation C4Or1A - Aerospace Cryocoolers III

Speaker

Dr Amir Jahromi (NASA - Goddard Space Flight Center)

Description

The cryogenics and fluids branch at NASA’s Goddard Space Flight Center is currently developing a high-efficiency, vibration-free, flight-worthy Continuous Adiabatic Demagnetization Refrigerator (CADR) that consist of two modular units: one that lifts ~6 microW at 50 mK while rejecting its heat to a 4 K thermal sink, and another unit that provides a constant 4 K cooling stage while rejecting its heat to a thermal sink at 10 K. The two units are linked together via a 4 K common platform. This paper discusses the status report on the thermodynamic performance of the 4 -10 K ADR. This ADR utilizes an Nb3Sn superconducting magnet and Gadolinium Gallium Garnet (GGG) as its refrigerant. Results show that an idealized cycle, one where its hold time at 4 K is equal to the recycle time, can lift 13 mW at 4 K with a hold time of 132 seconds.