CRYOPUMP AND METHOD OF OPERATING THE CRYOPUMP
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United States of America Patent
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Feb 18, 2014
filing date -
Feb 18, 2013
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Abstract
A cryopump includes a high-temperature cryopanel, a low-temperature cryopanel, and a cooling system. The cooling system has: a refrigerator provided with a first stage for cooling the high-temperature cryopanel and a second stage for cooling the low-temperature cryopanel; and a control unit configured to control a cool-down operation in which the first stage and the second stage are cooled in order to initiate a vacuum pumping operation of the cryopump. The cooling system may be configured to selectively provide a cooling relief effect to the first stage at least temporarily in the cool-down operation.
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