PT120A: 280 Torr

PT100A: 308 Torr

We valved in both QDP80 roughing pumps at 3:45 pm local today. Pressure is currently at 480 Torr on PT-120A. We will leave the pumps valved in tonight while we're in viscous flow. We verified both safety valves close upon pump failure. HAM 1 is also being roughed out via scroll pump and will stay valved in over night. PT-100A is currently at 416 Torr. Kyle and I have agreed to check pressures from home every hour and log results.

We are both leaving site now.

Site checks out fine. X-mid station air temperature feels warm, but that is to be expected; Bubba reports turning off chillers and we also see a rise in beam tube pressure (and GV AIP currents) since Sunday evening. 

CP3 and CP6 Dewars were filled today. CP3 truck arrived late and is still here (5:30 pm local). 

[Kyle, Chandra]

Started both QDP80 roughing pumps this morning with a purge air load to let them warm up before valving into corner volume. Blocks measure ~ 70degC.

Kyle checked the pressure of main volume to verify we aren't over pressurizing system with purge air - measured 1/2 psi with calibrated mechanical gauge that we use for proof testing viewports. PT-120A pirani gauge on BSC2 reads 942 Torr, which converts to 3.5 psi over standard atmospheric pressure, but we know this gauge is biased high.

   Added 200ml water to Crystal chiller and 100ml to diode chiller. Both chiller system filters are good. Will make another check at the end of the week.  

   Ran LVEA dust monitor check script. DM #2 is offline. All others are working. Given site stand down condition for holidays, I did not go into the LVEA to reset it. This can wait until Jan 2nd or if someone else remembers it before then.   

1625 hrs. local -> Checking standalone pumps in LVEA.  Expect to be here 30 minutes.  Will make Comment to this entry when leaving

BSC1's annulus ion pump current looked good until it didn't.  Now that the day is ending it looks like the AIP current has flattened (see attached graph).  If so, we may have to deal with this on Tuesday.  I sprayed helium around the outer O-ring of BSC3's recently installed door and didn't detect any smoking gun.  The large leak on the pump plumbing (10 ft away) made interpretation harder than it would have been otherwise.  I eventually fixed the 10-4 Torr range leak on the flex line and now the pump cart pressure and ion pump current are typical (see attached graph).  

Pump carts are pumping HAM1, HAM2, HAM3, BSC1 and BSC3.  HAM5 and HAM6 annulus volumes can't be pumped unless we install rubber stoppers and the HAM6 door flanges.  To do this, the "tacked on" South door of HAM6 will need to either be bolted or removed to allow installation of these.  

Mark D., Tyler G. and Bubba G. also installed the 3rd NEG pump atop the OMC in addition to installing doors and HAM2 and torqueing down HAM3's.  

Thomas Vo, Greg Grabeel, Gerardo Moreno

Thomas and I Replaced silver coated mirrors with the dielectric mirrors, changed the filter lenses for the Hartmann sensors, and changed the mount for two of the beam splitters that had clipping issues. I aligned the new optics roughly to the old beam path and used a temporary mirror in front of the periscope mirrors to check the back reflection. Currently the periscope is aligned to, roughly, the center of the first in-vacuum lens. Gerardo and I removed the Lexan guillotines from the viewports as well. Once the cables are attached we should be ready to begin alignment to in-vacuum targets.

Happy holidays and good luck vacuum crew.

Somewhat quiet day with HAM2 getting its doors put on and all doors being torqued down.

Shut down all computers in the Computer Users Room & Control Room which were not being used (kept on computers with notes on them, as well as the VAC computers). Also shut down a few TVs (kept some ON for those coming in to check the site over the holiday break).

Day's Activities:

• 15:33-17:54 HAM2 Doors installed (Bubba, Mark, Tyler)
• 16:18 Staging dust monitor vacuum pump at EX (Jeff B)
• 16:27 Squeezer cable-pulling around HAM5/6 & CER (Fil, Liz, Marc)
• 16:45 Squeezer Bay work with laser work, at-height workers have been consulted (i.e. Fil & crew) [Terry, working all day]---ONGOING at 4pmPST
• 16:53-19:38 AWC ("Active Wavefront Control"?) Viewport install on HAM5 door (Gerardo)
• 17:26 -19:23 HAM2/3 clean up (Ed)
• 17:45 LSC IOP went down causing lots of RED on the CDS Overview.  Luckily Jonathan happened to be in here, so he was able to fix this situation by running a model restart.  Not sure why we lost this IOP.
  • 17:57 restarting model (hanks)
• 18:00 Squeezer work in Optics Lab throughout day (Nutsinee)
• 18:08 Returning to work on tightening bolts on doors & then NEG pump. (Mark, Tyler...and Bubba later joined at 18:44)
• 18:45-20:11 Put HEPI actuators in RUN configuration (i.e. HEPI fluid will now cycle through actuators...they had been bypassed for chamber-work) [Hugh]
• 19:13 Squeezer work in Optics Lab throughout day (Sheila)---ONGOING at 4pmPST
• 19:20 Checking an LVEA microphone (Robert)
• 20:17-22:02 Squeezer cabling work continues (Fil, Marc)
• 20:18 Daniel in LVEA for Squeezer work
• 21:09-21:17 Gathering OSEMs (Travis)
• 21:16 Removing Lexan Guillotine for HWS table viewport + HWS table work (Greg, Gerardo)
• 22:33 Daniel in LVEA for Squeezer work
• 23:24 Oxcart out to LVEA (Gerardo)

The channels of the ASAIR LSC PDs were removed from the h1omc and h1lsc models. In the process a mistake with the OMC PZT readback channels was discovered. The DAQ channel list showed only 2 channels being hooked up, whereas in reality four channels are used. These 2 additional channels were intended for the CLF REFL RF6 readbacks. Issued ECR E1700426 to fix this. The LSC REFL and IMC CM board readbacks are now routed thru the ADC concentrator which inserts the CLF REFL channels into the two unused channels. This required a reconfiguration of the concentrator and a few reconnections in the ISC-C1 rack, as well as a change ot the h1sqz model.

By  noon, all HEPI Actuators were valved into the fluid stream and the pressure is running at nominal level (70 psi differential) under PID control.  The Reservoir Level switch has been set to trip with a drop in level of 1 to 3/16".  After 2 1/2 hours running steady state, there is no loss in reservoir level and inspection of the entire LVEA shows no problems.  I did not expect anything and if there were I'd expect a slow ooze rather than a flood.

I cleared out a buncha stuff on the SUS SDFs that were left over from BIO state switching, testing settings, and updated gains and offsets.  The first 2 were reverted back to their nominal states, the later 2 were updated.

The two attached trend plots show the X & Y dofs of the ISI CPS for HAMs 2 & 3 for the past ~90 days.

Bottom line: I will reset the isolating position to the current free hanging position.  Looking at the trends over the last few months while working on the IO, the locked positions for HAMs 2 & 3, X & Y have been ~40 to 50 um at worst and within a few um of the now free hanging positions.  It seems this shift in X & Y would not be noticed by the beam path.

Detail:

We'll revisit these numbers after pump down.  Setting these servo to position to the free hanging position is an effort to make the isolating smoother and less likely to cause an isi trip.  Additionally, when the platform does trip, the platform should move less making other systems (Sus) less likely to trip.