[chub, gautam]

1. ETMY cage was wiped down
   • Targeted potential areas where dust could drift off from and get attracted to a charged HR surface
   • These areas were surprisingly dusty, even left a grey mark on the wipe [Attachment #1] - we think we did a sufficiently thorough job, but unclear if this helps the loss numbers
   • More pictures are on gPhoto
2. Filters on SD and LR OSEMs were replaced - the open shadow sensor voltages with filters in/out are consistent with the T>95% coating spec.
3. IPANG beam position was checked 
   • It is already too high, missing the first steering optic by ~0.5 inch, not the greatest photo but conclusion holds [Attachment #2].
   • I think we shouldn't worry about it for this pumpdown, we can fix it when we put in the new PR3.
4. Cage wiping procedure was repeated on ITMY
   • The cage was much dustier than ETMY
   • However, the optic itself (barrel and edge of HR face) was cleaner
   • All accessible areas were wiped with isopropanol
   • Before/after pics are on gPhoto (even after cleaning, there are some marks on the suspension that looks like dust, but these are machining marks)

Procedure tomorrow [comments / suggestions welcome]:

1. Start with IY chamber
   • Peel first contact with TopGun jet flowing
   • Inspect optic face with green flashlight to check for residual First Contact
   • Replace ITMY suspension cage in its position, clamp it down
   • Release ITMY from its EQ stops
   • Replace OSEMs in ITMY cage, best effort to recover previous alignment of OSEMs in their holders (I have a photo before removal of OSEMs), which supposedly minimized the coupling of the B-R modes into the shadow sensor signals
   • Best effort to have shadow sensor PD outputs at half their fully open voltages (with DC bias voltage applied)
   • Quick check that we are hitting the center of the ITM with the alignment tool
   • Check that the Oplev HeNe is reasonably centered on steering mirrors
   • Tie down OSEM cabling to the ITMY cage with clean copper wire
   • Replace the OSEM wiring tower
   • Release the SRM from its EQ stops
   • Check table leveling
   • Take pictures of everything, check that we have not left any tools inside the chamber
   • Heavy doors on
2. Next, EY chamber
   • Repeat first seven bullets from the IY chamber, :%s/ITMY/ETMY/g
   • Confirm sufficient clearance between IFO beam axis and the elliptical reflector
   • Check Oplev beam path
   • Check table leveling
   • Take pictures of everything, check that we have not left any tools inside the chamber
   • Heavy doors on
3. IFO alignment checks - basically follow the wiki, we want to be able to lock both arms (or at least see TEM00 resonances), and see that the PRC and SRC mode flashes look reasonable.
4. Tighten all heavy doors up
5. Pump down

All photos have been uploaded to google photos.