Patent ID: 9440165
Filing Date: 2016-09-13
CPC Classification: B01D,F04B

Claim Text:
1. A cryopump comprising: a cryopanel having an adsorption region for adsorbing gas molecules; a cryopump housing arranged to enclose the cryopanel; a rough valve configured to connect the cryopump housing to a roughing pump; a pressure sensor configured to measure an internal pressure in the cryopump housing; a control unit configured to control a stopped period of the pressure sensor and regeneration of the cryopanel; wherein the stopped period comprises a period during which no current flows through a filament of the pressure sensor; wherein the control unit is further configured to set the stopped period for an initial stage of the regeneration and causes the rough valve to open for rough evacuation of the cryopump housing at least once during the stopped period; a temperature sensor configured to measure a temperature of the cryopanel, wherein the control unit executes a heating control of the cryopanel, in the initial stage, toward a target temperature higher than a temperature at which adsorbed as molecules are released from the adsorption region, wherein the control unit executes the rough evacuation, during the heating control, when a temperature measured by the temperature sensor exceeds the temperature at which adsorbed gas molecules are released, wherein the stopped period begins immediately before a start of the regeneration and ends after a rough evacuation has been completed, and wherein the rough evacuation is completed by closing the rough valve.