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Not sure if there's vacuum grease that can work at very low temperatures, the upper stage of the cryostat would go to 300 mK and the lower stage to 20 mK, at th
by ThePhysicist 3y ago
Not sure if there's vacuum grease that can work at very low temperatures, the upper stage of the cryostat would go to 300 mK and the lower stage to 20 mK, at that temperature non-metallic compounds tend to get porous. There are materials that can work in there but to my knowledge nothing that was an easy solution, at least at the time.
- lazide 3y agoIf you're dealing with single molecule cracks and extreme vacuum, even vacuum grease is going to offgas and contaminate things. Hydrogen is EXTREMELY small, the temps the poster is talking about are very very low, and XHV/UHV is extremely low pressure vacuum. Like 'single molecules we don't want rattling around is a problem', 'more vacuum than outer space vacuum', and 'oxygen long ago turned into a solid' temperatures. [https://en.wikipedia.org/wiki/Vacuum_grease https://en.wikipedia.org/wiki/Vacuum_grease]