Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 84 seconds. TC B did not register fill. LLCV set back to 21.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 857 seconds. LLCV set back to 32.0% open.

Here's the latest pump down curve - log/log scale. Ideally we want to wait till 1.0e-7 Torr to open up to beam tube, but we can compromise with 2.0e-7 Torr. In that case, looks like we will be opening GV5,7 late next week.

We can open up GV 1,2 earlier if folks need oplev assistance for alignment.

I valved the turbos back into X&Y beam manifolds, valved out the IPs, and now X turbo is being backed by scroll (not turbo-leak checker), so both volumes are essentially identical. Trending pressure curve today. We have three full bottles of He on standby. ;)

Attached is a trend plot of 45 days for the HEPI pumps.  I included the pressure channels from the vertex, where we are currently pumping down after venting to view/clean ITMX.  Changes in EY and EX Vout signals coincide with the vent, so possibly due to intentional changes.

• IMC is locked
• no notes about people on site that started before my shift

[Jenne, Kiwamu, Vaishali with help from JimW and JeffK]

Continuing the locking effort from yesterday (36197), we managed to get the mode cleaner to lock. Here's a roll down of the events from today:

1. We (Jenne and I) first aligned the MC2 REFL camera because we were almost on the edge of the PD.

2. As this didn't fix the not locking problem, we asked Kiwamu for help and then we looked at a bunch of parameters like filters, gain thresholds, ramp times.  We also looked to check if the suspensions were behaving correctly and then found the mirror which had been turned off. This button (MC2 M2) was not in use at all. Maybe we should have double checked the sdf differences but we know better now.

While we were aligning the MC2 REFL we noticed that MC2 Trans wasn't looking like what it used to. We tried to trace the beam and found that the camera was being illuminated by a ghost beam and not the actual transmission beam of the MC. We found a bright spot by looking into the light pipe and then found that the beam wasn't coming onto the telescope at all. As we couldn't see anything on the viewer card, we turned up the laser power to 10 W and found the beam again in the light pipe only with the IR viewer.

Jenne then tried to gently tap the light pipe (this is the same pipe that had problems yesterday and was fixed) with me looking at the bright spot and it didn't move at all which leads to us believe that the beam might be hitting the edge of the table somewhere.

After hypothesising out loud that this might have been because the tables hadn't returned to the correct positions, we were corrected by JimW who told us that the ISIs return back to their positions on their own.

We then tried to change the axis of the modecleaner in order to redirect the beam in the light pipe but we weren't too successful.

Not having solved this mystery of what happened to MC Trans, we concluded the work for today with a modecleaner that locks at 2 W and 10 W.

Jenne will correct me if I have missed something or used wrong names of mirrors in comments !

J. Kissel

Checking the bill of health of H1 SUS ITMX's suspension with standard driven transfer functions, I can say that both the main and reaction chains appear clear of rubbing without any normal offsets used in the Nominal Low Noise. Recall the ITMX reaction has had rather large offsets on for most of O2 to alleviate suspected rubbing (see e.g. LHO aLOG 33395). I'll do some more study tomorrow with various combinations of alignment and rubbing alleviating offsets in place to make sure that this statement holds in all locations we use.

For now, today's data lives here:
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGM0/Data
    2017-05-16_2250_H1SUSITMX_M0_WhiteNoise_L_0p01to50Hz.xml
    2017-05-16_2250_H1SUSITMX_M0_WhiteNoise_P_0p01to50Hz.xml
    2017-05-16_2250_H1SUSITMX_M0_WhiteNoise_R_0p01to50Hz.xml
    2017-05-16_2250_H1SUSITMX_M0_WhiteNoise_T_0p01to50Hz.xml
    2017-05-16_2250_H1SUSITMX_M0_WhiteNoise_V_0p01to50Hz.xml
    2017-05-16_2250_H1SUSITMX_M0_WhiteNoise_Y_0p01to50Hz.xml
/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ITMX/SAGR0/Data
    2017-05-16_2345_H1SUSITMX_R0_WhiteNoise_L_0p01to50Hz.xml
    2017-05-16_2345_H1SUSITMX_R0_WhiteNoise_P_0p01to50Hz.xml
    2017-05-16_2345_H1SUSITMX_R0_WhiteNoise_R_0p01to50Hz.xml
    2017-05-16_2345_H1SUSITMX_R0_WhiteNoise_T_0p01to50Hz.xml
    2017-05-16_2345_H1SUSITMX_R0_WhiteNoise_V_0p01to50Hz.xml
    2017-05-16_2345_H1SUSITMX_R0_WhiteNoise_Y_0p01to50Hz.xml

I'll export and compare with old reference data in due time.

Interesting pressure trends on X & Y beam manifolds. See my previous aLOG about rate of rise test followed by pumping on just turbos (IPs valved out). PT180 (y-arm) trend has shifted and headed up! Does this mean the fault is in IP6 and not a leak?

After speaking with Chandra, I've turned the RH drivers back on to do a test on the HWSY alignment right now.

I'm going to turn them off again in about 40 minutes.

Because commissioning work is starting in earnest now, all of the seismic systems have been restored to their nominal configurations. This means ITMX & HAM4 HEPI's were unlocked yesterday after the cleanroom was moved out of the way, all HEPI's and ISIs are back up and running and all sensor corrections (including BRSs) are running on all chambers.

The only difficulty we found was the GS13 gain switching on HAM2 is no longer stable (ie we can't switch GS13 gains while the ISI is isolated). Hugh and I are working with Fil to try to figure that out, but this is a new "feature", we will probably be opening an FRS on it soon.

   Peter K. & Jeff B.  ECR E1700096

   Installed the PSL Air Trap/Bleed in the Crystal Chiller return line. The installation went well. Encountered one small issue. The pipe being cut was installed about 6 years ago. It did not cut as cleanly as the new pipe. On a couple of cuts the last third of the pipe broke before it was sheared through. Will need to be cognizant of this when installing the next three assemblies. 

   When the chiller was restarted the water compressed several inches of air in the standpipe. The ball valve at the top of the standpipe was used to bleed off excess air. I left about 4 inches of air trapped in the standpipe to act as a water flow damper. 

   The remaining three air Trap/Bleeders will be installed during the next big vent.         

From 1 PM to 4 PM local time.

Good catch report:
I told Corey it was alright for him to open the high bay rollup door into the LVEA to push a pallet into the LVEA. Later I remembered that the LVEA was in laser hazard and therefore he should not do this. I managed to run over and stop him before he opened the door.

20:22 UTC Corey taking forklift to highbay to drop off pallet.
20:30 UTC Filiberto to end stations to check documentation.
20:40 UTC Karen driving car to VPW
20:42 UTC Corey opening high bay outside rollup door, driving forklift into highbay, dropping off pallet
Aidan and TJ to HAM4, work on HWS table
~ 20:59 UTC Let a truck related to Norco through gate. Could not understand driver after three attempts.

Gerardo changing IP6 from dualvac to gamma controller
21:22 UTC Filiberto back from end stations
22:13 UTC Betsy to LVEA to store equipment
22:17 UTC Jenne, Vaishali and Jeff to LVEA to talk to Aidan
22:25 UTC Jenne and Vaishali working on MC table
22:25 UTC Jeff K. taking transfer functions of ITMX, turning on sensor correction for ITMX
Jenne and Vaishali out of LVEA
23:13 UTC Aidan and TJ done in LVEA, TJ returning to get something
23:19 UTC TJ back

[John, Chandra]

More investigation on leak hunt of x-beam manifold. Here's what we're trying now:

• Valved out IP5 & IP6 on x & y beam manifolds to measure rate of pressure rise (looks like x is rising 2-3x more than y)
• Hard closed GV5 & GV7 to confirm no help from adjacent cryopump (no change in rate of rise)
  • We found that hard closing GV5 does not change status on MEDM from yellow to red (FRS 8142)
  • GV7 hard closed fast at around 20 psi
  • GV5 wouldn't hard close at maxed out 80 psi, so we partially re-opened to re-seat the gate. Then it hard closed around 40 psi with a very loud bang
• Valved in x & y beam manifold turbos to trend the pressure drop. Inlet pressures (foreline pressures) before and after valving in:
  • Y:  valve closed: 5.2e-8 Torr (7.6e-3 Torr); valve open: 9.0e-8 Torr (7.6e-3 Torr)
  • X: valve closed: 2.2e-9 Torr (1.0e-3 Torr); valve open:  5.2e-8 Torr (1.0e-3 Torr)
  • Note:  X turbo is being backed by leak checker equipped with a turbo; Y turbo is backed by scroll only
  • Attached is trend so far (log scale & linear scale)
• NOTE that PT-180 was baked by Kyle many months ago when we were investigating why these two new hot cathode ion gauges drift up in pressure while the cold cathode (PT-120) doesn't follow same trend. Do we trust the gauges??
• Chris will refill the three empty He gas bottles so we can resume spraying the tube tomorrow

WP 6625
ECR E1600210

The Kepco HV power supplies for ITMX, ITMY, and ETMX were replaced with an equivalent linear supply made by Mid-Eastern Industries Inc. Power supplies for ETMY were replaced on Dec 5 2016. Alog 32186.

New units installed:
S1700114 & S1700115 ITMY/ITMX
S1700116 & S1700117 ETMX
S1610431 & S1610433 ETMY