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Operation of A Sunpower M87 Cryocooler In A Magnetic FieldThe Alpha Magnetic Spectrometer-02 (AMS-02) is an experiment that will be flown as an attached payload on the International Space Station to detect dark matter and antimatter. It uses large superconducting magnets cooled with superfluid helium to bend the path of cosmic particles through a series of detectors, which then measure the mass, speed, charge, and direction of the particles. Four Sunpower M87N Stirling-cycle cryocoolers are used to extend the mission life by cooling the outer vapor-cooled shield of the dewar. The main magnet coils are separated by a distance of approximately 1 m and the coolers are located approximately 1.5 m from the center line of the magnet, where the field is as high as 925 gauss perpendicular to the cryocooler axis and 400 gauss along the cryocooler axis. Interactions between the applied magnetic field and the linear motor may result in additional forces and torques on the compressor piston. Motion of the compressor arid displacer pistons through the magnetic field spatial gradients will generate eddy currents. Additional eddy currents are created during magnet charge, discharge, and quench by the time-varying magnetic field. The results of tests to determine the magnitude of the forces, torques, and heating effects, as well as the need for additional magnetic shielding, are presented.
Document ID
20020080839
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Breon, S. R. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Shirey, K. A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Banks, I. S. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Warner, B. A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Boyle, R. F. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Mustafi, S. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Krebs,Carolyn A.
Date Acquired
September 7, 2013
Publication Date
January 1, 2002
Subject Category
Engineering (General)
Meeting Information
Meeting: 12th International Cryocooler Conference
Location: Cambridge, MA
Country: United States
Start Date: June 17, 2002
End Date: June 20, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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