P1 at 750 Torr, Vent valve VV1 is left open to atm. It will reach equilibrium in an hour. The PSL power is not turned down yet. The beam path is blocked at two places inside the enclosure.
The low power 20 mW input MC can be locked tonight.
Next day's - Thursday notes:
We reached 760 Torr of atm in 8 hrs at 1.7 Torr/ min with 5 cylinders of instrument grade air.
Used 500 PSI of nitrogen to get to 20 Torr at first. This flow and the first cylinder of N2 has to be slower next time.
We did the following:
1, oplevs were centered on locked caveties 2 days ago
2, just before vent we rechecked arms pointing, they wre still locking
3,eloged strain gages and turned HVs off at PZT-steering at 1Y3 rack and OMC-PZT ps at 1X2 aux rack. They were actually off.
4,,checked jam nuts 6 places x 3
5, turned oplev servos off
6, eloged SUS summery page
7, checked particle counts at ITMY: 1 micron 300, 0.5 micron 3K, 0.3 micron 30K particles / cft-min. All three cranes were wiped 2 days ago.
8, blocked laser into IFO: main 1064 in 1.25W were blocked by manual 2 blocks on PSL table. The PSL output shutter was left open to be triggered by interlock at P1 3 mTorr. It did!
Aux NPRO-AP and green light input at both ends were blocked.