Helium leak checked the joints listed below via the new Inficon UL1000, backing vertex turbo, while X/Y-BM turbos were valved out. The background started at 6e-9 mbar-L/s and drifted to 1.4e-8 mbar-L/s after valving out other two turbos, likely from cross talk due to relatively high volume pressure. No leaks found above this background.
- three NEG reducer flanges on OMC
- IP4 GV on OMC
- TMDS flanges and GVs on BSC 1,3 doors
- (existing) TCS viewport flanges on BSC 1,3 doors
- (existing) HAM2-E bottom-middle viewport flange
- ESD flangles & feedthroughs on BSC 1,3 chambers
- PT-120 valve & flanges on BSC 2
- YBM turbo isolation GV
- two blanks that replaced i-LIGO RGA port on BSC 7,8
- viewport flange on HAM5-N door