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The principle function of a cryopump system is to capture and retain gases from within a vacuum chamber. Cryopumps are ultra-clean, contaminant-free dry pumps that have an ability to effectively pump water vapor over and beyond other devices. A cryopump system is suitable for applications that operate in the HV and UHV vacuum pressure ranges.
I picked an article about cryopump from internet for your further reference.
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