What is the advantage of a cryogenic sorption pump over a mechanical roughing pump?
Most mechanical roughing pumps require a lubricant for moving parts. The oil could possibly migrate into the vacuum system, which could be catastrophic to some applications. For a completely oil-free system, a cryogenic sorption pump offers an ideal solution. Advances in roughing pump technology have led to oil-free mechanical pumps. However, dry mechanical pumps may be cost prohibitive, in which case a cryogenic sorption pump may be suitable.
