The baffle on the +Y, +X wall of HAM2 has to be moved in order to enter the MC tube from the +Y door of HAM2. I readjusted it after it was moved, but, in case I am not around, the important thing is that it stick out about 2 cm from the tube wall. This means that the upper and lower corners of the baffle stick out past the wall of the beam tube just a tiny bit. I attach the photo from the original log, 75688, to demonstrate this. 

Ibrahim, Betsy, Rahul

First contact was successfully poured on BBS01 AR side. Pictures below.

I brought a hand held dust monitor into the MC tube when I was taking beam spot photos in support of baffling in HAM3. With gentle steps (soft impact between chamber floor and boot) and fully counting 1001, 1002, I could keep the level well under 100 particles >0.5um per cubic foot. Speeding up increases the level dramatically. I found a few large particles under the HAM2 ISI, but I did not wipe under there for fear of suspending smaller particles. I think that the best thing we can do for dust is to learn to move slowly when we are in chamber.

Ibrahim, Betsy, Rahul, GariLynn

Following AR side first contact removal, we did our first flashlight inspection of the AR side (S2) of the optic. We found that there were 4 spots of varying size all under 1mm, perfectly circular. They seem to look like water (look at image). We contacting COC (GariLynn), who informed us this may be some coating defect. Nontheless, we tried cleaning it.

There are 2 smaller spots on the side of the optic (see image). There are 2 other spots near the center, with one being pretty dead on-center.

First, we used acetone with a cotton swab to wet two spots (the ones on the side). This didn't work and the spots were still there.

Second, we followed T1800350 to clean two spots with water, then immediately apply first contact. This didn't work either.

We will continue to clean spots with water tomorrow. Images below.

TITLE: 05/06 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
SHIFT SUMMARY: Lots of work being done in the LVEA. Scaffolding was erected around GV7, the BBS is here and getting magnets bonded and cleaned, the IAS team is finishing final shots on the old BS, CP1 is still warm, SPI plate was put onto HAM2, and more!
LOG: 

J. Kissel, J. Warner
ECR: E2400026
WPs: 13237, LHO:13238
Final Design Doc: T2400145
Relevant Systems Level Drawings:
    . Mechanical Assemblies
        :: ISIJ Reflector D2400102
        :: HAM Table Baffles D1700335
        :: HAM2 Systems Layout D0901083 (not yet-inclusive-of-SPI)
    . Electronics Wiring Diagram 
    . Cable Routing In-vac Cable Routing Plan from G2401479 (pages )
    . Flange Layout D1002873-v11

Executive summary:
    - Removed ISIJ +X-side, center, HAM2 ISI table baffle from D1700265-v4 Type 2 
        :: Bracket mounting bolts left screwed into ISI optical table for this will eventually become a D1700265-v4 Type 3 and remounted.
    - Installed ISIJ Reflector + QPD Assembly D2400102 on +X ISI side wall (D071057-v2), with its shroud (D2500030) in place
        :: We didn't weigh it, but the SW Assembly predicts a mass of 1.96 [kg], which we can likely round up to 2.0 [kg] with the shroud installed.
    - Routed and connected QPD read-out cable system to D3 flange, F10 spigot.
    - Routed and connected picomotor cable system to existing D1101515 quadrupus leg Cable #3, J4 
        :: Cable #4, J5 is connected to IO PM5 mirror, Cables #2 J3 and #1 J2 were reset in neat coil with connectors floating to avoid electrical grounding as before.
    - Nudged make-shift baffle system using D1700261 ballast mass baffle mounted vertically on the +X / +Y / Beam Height corner of the chamber wall upon entry into beamtube.
        :: the will DEFINITELY need a technically-minded reset.

In at 10:30a PT and out by 12:30a PT. It's so lovely when everything goes to plan!

Pictures and further info to follow in the comments below.

Robert, Mitchell

During HAM3 chamber work yesterday the lower panel of the MCB2 panel was removed. This was needed for a clear path for the SPI. There were concerns that the removal would be difficult. The tolerence on the holes in the panels put strain and binding pressure on the screws going into the gussets. A few of the screws needed to gentle coaxing with patience and some Isopropal alcohol. Eventually they all came out without breaking or seizing. No pictures of the removal process were taken.

Pictures of the baffles added to HAM3 will be documented in a different alog.

The chillers have been turned on at the mid stations for the season. 

FAMIS 28773

pH of PSL chiller water was measured to be between 10.0 and 10.5 according to the color of the test strip.

The MC2 SW WD tripped due to chamber activity, but not the sus WD. Oli let me know that the SWWD threshold is set a bit too low, and that the suspension itself looks ok, so I've bypassed the SWWD for now so we can keep the suspension damped if possible.

Just before lunch yesterday, vac told me doors were off HAM2. I then went out and locked the ISI and added steps to the chamber.

TITLE: 05/06 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.18 μm/s
    Secondary useism: 0.23 μm/s 
QUICK SUMMARY: Currently riding out a 5.8 earthquake from the Aleutians. No new alarms, CDS overview has expected errors in: h1iopsusb2h34, h1suslo12-bbss, h1iopseib2. and h1seiproc has an IPC error.

• Dust counts - good
• Temps - good
• All chambers and suspensions in states according to teh whiteboard in the control room

(Jordan, Travis, Randy, Mitchell, Gerardo)

The +Y and -Y doors are off HAM2. The removal of the doors was made easy by removing most of the bolts the prior day by Travis and myself.
    + Y Door we had both O-rings get stuck to the door, we used the O-ring tools to set the O-ring back into their groove without problems.  No further issues.
    - Y Door had similar issues as the +Y door, when the door separated from the HAM chamber the O-rings were stuck to the door, same fix as the other door.  Something to note, this door's chamber flange has lots of oxide residue on the outside of the outer O-ring, as if it was sprayed heavily with alcohol.

To be able to remove the doors for this chamber as well as HAM1, both chambers are under the same cleanroom, we need to shift the cleanroom along the Y axis to accommodate the forklift mast height when removing the doors, any door.  Maybe this cleanroom should get longer legs and maybe that way keep a permanent position.

A big "thank you" to those that helped move the cleanroom.

Betsy, Ibrahim

Today we:

• Reattached vacuum tubing for the ERGO arm and tested it on some test glass.
  • Tubing is now new (Tygon A-60-F)
  • Vacuum was ran and attached
  • Crash pad moved from Bonding
• Inspected the BBS and fit-check the flipping fixture and magnet gluing set-up. Did a vague run-through of plan of attack tomorrow for the BBS first contact, magnet gluing and optic handling.