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Qualifying the Sunpower M87N cryocooler for operation in the AMS-02 magnetic field by Shuvo Mustafi; Stuart Banks; Kim Shirey; Susan Breon is a Engineering article available to read on EtoBox.

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The Alpha Magnetic Spectrometer-02 (AMS-02) experiment uses a superfluid helium dewar to cool a large superconducting magnet. The outer vapor-cooled shields of the dewar are to be held at 80 K by four Sunpower M87N cryocoolers. These cryocoolers have magnetic components that might interact with the external applied field generated by the superconducting magnet, thereby degrading the cryocoolers' performance. Engineering models of the Sunpower M87 have been qualified for operation in a magnetic environment similar to the AMS-02 magnetic environment. Although there was no noticeable performance degradation at field levels that were comparable to AMS-02 field levels, there appears to be a small performance degradation at higher field levels. It was theorized that there were three possible issues related to these performance losses at high magnetic fields: (i) induced piston rubbing on the cylinder wall due to forces and torques on the linear motor due to the applied magnetic fields; (ii) magnetic hysteretic and/or eddy current damping of the balancer due to its motion in the applied magnetic fields; (iii) inductance losses in motor due to the applied magnetic field. The experiments co

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Author

Shuvo Mustafi; Stuart Banks; Kim Shirey; Susan Breon

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0011-2275)

Published

2004

Language

EN

Field

Engineering (Physical Sciences)