Ice layer formation in vacuum environments
- Document #:
- LIGO-T1900786-v1
- Document type:
- T - Technical notes
Other Versions:
- Abstract:
- A quick formulation of the condensation rate for water in rarefied environments. At 10^-8 Torr partial pressure of water, ice deposits at ~100 nm/day on surfaces colder than 137 K. The rate is roughly linear with pressure until the saturation pressure. If any ice is accumulated on a 124 K surface (saturation pressure of 10^-11 torr), at best it will thermally evaporate at 6 nm/month. The presence of a cryo shield and cold beam tube can loosen the requirements for no ice accumulation on the test mass by a factor of 10^3. However, to reach this water partial pressure we might still need to wait until the ion pumps are engaged.
- Files in Document:
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- Water_Pressure.pdf (364.6 kB)
- Authors:
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