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Adiabatic demagnetization refrigerator for use in zero gravity
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dingus, Michael L. |
| Copyright Year | 1988 |
| Description | In this effort, a new design concept for an adiabatic demagnetization refrigerator (ADR) that is capable of operation in zero gravity has been developed. The design uses a vortex precooler to lower the initial temperature of magnetic salt from the initial space superfluid helium dewar of 1.8 K to 1.1 K. This reduces the required maximum magnetic field from 4 Tesla to 2 Tesla. The laboratory prototype vortex precooler reached a minimum temperature of 0.78 K, and had a cooling power of 1 mW at 1.1 K. A study was conducted to determine the dependence of vortex cooler performance on system element configuration. A superfluid filled capillary heat switch was used in the design. The laboratory prototype ADR reached a minimum temperature of 0.107 K, and maintained temperatures below 0.125 K for 90 minutes. Demagnetization was carried out from a maximum field of 2 T. A soft iron shield was developed that reduced the radial central field to 1 gauss at 0.25 meters. |
| File Size | 4392904 |
| Page Count | 143 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930006500 |
| Archival Resource Key | ark:/13960/t0qr9qb2f |
| Language | English |
| Publisher Date | 1988-06-16 |
| Access Restriction | Open |
| Subject Keyword | Materials Processing Cryogenic Equipment Refrigerators Weightlessness Liquid Helium 2 Vortices Prototypes Liquid Helium Adiabatic Conditions Magnetic Fields Superfluidity Microgravity Magnetic Cooling Demagnetization Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
