jordan.vanosky@LIGO.ORG - posted 13:14, Monday 21 April 2025 (84028)
LN2 Dewar Inspection 4/21/25 and Vacuum Jacket Pressures
A Norco tech came to the site to inspect the 8 LN2 dewars that feed the cryopumps. Inspection report will be posted to Q2000008 once received.
- No major issues found, some small leaks were repaired as they were found
The vacuum jacket pressures were also measured during inspection:
The vacuum jackets were all pumped down to <10 mtorr last May (excluding CP4 which is not in use), see alog 77742
| Dewar | Pressure (micron/mtorr) |
| CP1 | 12 |
| CP2 | 21 |
| CP3 | 215 |
| CP4 (not in service) | 220 |
| CP5 | 12 |
| CP6 | 10 |
| CP7 | 16 |
| CP8 | 9 |