Cryostat for Cyclotron Irradiation at Liquid Helium Temperatures

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Abstract
A description is given of a cryostat which has been developed for cooling small specimens with liquid helium while they are subjected to irradiations of several days duration in a cyclotron beam. The cryostat is fabricated for the most part from commercially available sheet-metal parts and consists essentially of a liquid helium vessel shielded by a liquid nitrogen cooled envelope. The intrinsic loss rates for refrigerants with this apparatus are about 5 liters per day of liquid nitrogen and 600 cc of liquid helium per day, but considerably larger loss rates are encountered during periods when the cyclotron beam is on. The performance of the cryostat during irradiation experiments is discussed.

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