Simulation Analysis of Ultimate Vacuum Scheme for Coupler Warm Windows
The vacuum pump port of the high-power coupler warm window of the injector 1.3 GHz cryomodule of Shenzhen superconducting soft-X-ray free electron laser(S3FEL)is connected to the vacuum main via an angle valve for easy installation,leak detection and troubleshooting.In order to ensure that the ultimate pressure of the coupler warm window meets the standard before the cryomodule cools down,through theoretical calculation and software simulation,the ultimate vacuum degree that the coupler can maintain under different schemes were compared and verified.The results show that the ultimate vacuum degree of the untreated coupler tube A using a single ion pump does not meet the actual engineering indicator.After high-temperature baking of coupler tube A,its ultimate vacuum degree reaches the level of 10-7 Pa,and is better than the actual engineering indicator.After setting up two ion pumps in coupler tube A,the ultimate vacuum pressure decreases by 50%,which can meet the engineering standards by further increasing the number of ion pumps.
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