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I have completed the following non-Steve portions of the pre-vent checklist [wiki-40m.ligo.caltech.edu]
- Center all oplevs, transom QPDs (and IPPOS + IPANG if they are set up)
- Align the arm cavities for IR and align the green lasers to the arms.
- Update the SUS Driftmon values
- Reconcile all SDF differences
- Reduce input power to no more than 100mW (measured at the PSL shutter) by adjusting wave plate+PBS setup on the PSL table BEFORE the PMC. (Using the WP + PBS that already exist after the laser.)
- Replace 10% BS before MC REFL PD with Y1 mirror and lock MC at low power.
- Close shutter of PSL-IR and green shutters at the ends
All shutters are closed. Ready for Steve to check nuts and begin venting!
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- checked all jam nuts
- checked all viewports are covered
- turned oplev servos off
- took pictures of medm screens: sus summs, aligned oplev centering, IFO& MC alignment biases and vac configuration
- checked particle counts
- checked crane operational safety
- closed V1, VM1, annuloses
- opened VV1 and vented with Airgas brand, Industrial Grade Nitrogen [ 99.99% ] to 25 Torr
- switched over to Airgas brand compressed air, Alphagas " AI UZ300 " with Total Hydro Carbon 0.1 PPM |