Abstract
Gifford-McMahon (G-M) cryocoolers are applied to cool down superconducting magnets. Operation conditions of a G-M cryocooler are restricted by the magnetic field. This limitation strongly affects the cryogen free magnet design. The paper presents the performance test results of a commercial G-M cryocooler with a cooling power of 1.5W at 4.2K (RDK-415 from SHI) in magnetic field. The cryostat with the tested G-M cooler has been installed in the room temperature bore of a 10 T conduction cooled superconducting magnet. The maximal induction of magnetic field applied to the second stage of the cooler was 1.9 T. Above this limit the coldhead operated with abnormal sound. The performance has been measured by means of two resistive heaters and two thermal sensors mounted on the 1st and the 2nd stages of the G-M coldhead.
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