This morning I relieved the PR3 of the mechanical rubbing Kissel pointed out in 39384.  The Front HR Upper Right stop was grounded on the face of the optic.   I also freed up the locked down PR2.  We'll run some TFs at lunch when IO is finished with the MC bypass install, but before alignment through the PR chain.

We'd like to go back at this after IO completes today to consolidate and put viton under another table mass.  Otherwise we are pretty well balanced and have repeating locking.  The delta tilts on the table are +44.6urad in RX and +23.7urad in RY.  This delta is the difference from when we first locked the ISI after venting but before work commenced to the current repeatable locked position.  To compare, on HAM4 the deltas were -46 and +11urads.

This morning I completed the weekly PSL FAMIS tasks.

HPO Pump Diode Current Adjustment (FAMIS 8448)

I immediately noticed that something was off; the power reading for DB1 was around 83%, when it was > 86% when I finished last week.  That is a large decline over 7 days, so I trended the individual laser diodes of the diode box (1st attachment).  Something happened with Diode 3 of DB1 on November 10th.  The laser diode power was last adjusted on Nov. 7, and the increase can be seen in the attached trend.  After this though, the power for laser diode 3 began increasing, finally hitting some tipping point on Nov. 10th at ~17:41 UTC; at this point the diode laser dropped over the course of ~7 hours and stabilized.  The effect this had on the overall diode box power can be seen in the final plot of the attachment (H1:PSL-OSC_DB1_PWR).  It is unclear at this time what caused this behavior; investigation continues.

Continuing with the FAMIS task, I turned the ISS OFF and adjusted the operating current of the HPO DBs.  The results are summarized in the below table and a screenshot of the PSL Beckhoff main screen is attached for future reference.

I should note that in the last 2 weeks, I have had to increase the operating current of DB1 by 0.6 A (0.3 A per week).  This is a change from the usual 0.1-0.2 A weekly increase.  It should also be noted that all of the DBs were increase by 0.3 A last week.  The increase should remain roughly linear, and a departure from linearity can be an early indication of a failing DB.  I will continue to monitor this.

I also adjusted the operating temperatures of the HPO DBs, changes summarized in the below table.

Despite this, the HPO is still only outputting 154.1 W, down from the 155.0 W I left it at after last week's adjustment.  I will continue to keep an eye on DB1, and investigation into the DB1 diode #3 glitch discussed above will continue.  This completes FAMIS 8448.  The ISS is back ON.

PSL Power Watchdog Reset (FAMIS 3676)

I reset both PSL power watchdogs at 18:03 UTC (10:03 PST).  This completes FAMIS 3676.

Check of dust monitor vacuum pumps on 11/13/17 showed: 

End-X - Opened up air bypass to adjust pressure to 15 in/Hg.

End-Y - No changes all within spec.

CS - Opened up bypass just a little to fine tune pressure to 15 in/Hg. Pump is getting a bit noisy and there is carbon dust buildup on the filter. These are signs of wear on the vanes, and a pending rebuild. Have the rebuild kit in stock. 

Following on the LHO recent watchdog upgrades (39392,39298) I was interested in seeing how the platforms and suspensions behaved during yesterday's earthquake (alog 36683).

At LHO, most platforms were already tripped when the earthquake happened (because of the vent, I suppose), except for the end stations, which did not fully trip during the earthquake, and were switched to the damping state instead (End-Y after the first wave peaked, and end-X after the second one). See figure 1.

At LLO, all platforms tripped, BSCs first, then HAMs when the large wave hit us, see figure 2.

It would be interesting to know how Sheila's sus guardian change helped keep the suspension damped at LHO (from the operators screen, all sus were green at the time of the eq, see screenshot from alog 36683).

Otherwise this is a positive first demonstration of the new sei watchdog scheme.

The purge-air supply for the LVEA was shut down between 0900 - 1400 hrs. today for short notice maintenance.  As such, in-chamber activity was prevented for much of the day.  

Chandra R., Kyle R., Rakesh K.  

Today we replaced the 12"CFF-ISO adapter mounted to CP1's 10" gate valve (in closed position since 1998) with a 12"CFF x 8"CFF x 4.5"CFF x 2.75"CFF reducing cross.  

Last week, during our initial preparation for leak testing the vacuum volume bound between GV5 and GV6, i.e. CP1 plus misc. flanges, we had tightened the 10" gate valve (1/2 turn) and noticed a pressure response on PT114B. This observation, combined with the fact that this volume had been helium leak tested in the past without finding any external air leaks, caused us to suspect that the blanked-off adapter volume could be at a relatively high pressure and may have been acting as a "virtual leak" across the inadequately closed gate valve for the past 20 years.  To test this theory, we "cracked" open the ISO blank so as to allow some room air into the adapter volume.  In doing so, we did not perceive that any air back-filled into the adapter.  Rather, it seemed as if the adapter was already at atmosphere.  However, there may have been a slight pressure increase in PT114B when we did this (see attached graph).  

The pressure response of PT114B seems counter-intuitive but is not unprecedented.  The as found adapter volume may have been less than an atmosphere and back-filled in a small amount of room air (noisy work area, may not have heard this) and thus increased the leak rate(?).  This would explain the small "bump" in pressure.  Following this by then pumping the newly installed reducing cross would have significantly reduced the closing force experienced by the gate which could then have resulted in more gas making it across the closed gate(?) 

We will continue tomorrow.  For tonight, we are leaving the 10" valve closed and the reducer cross under vacuum. 

More info / changes needed to find an AC-ON-all-the-time stable temperature for the PSL.

Temperature range of the table sensors change with changes to the makeup air.

There's a way to see/set the temperatures that controls the AC unit coming on and turning off, and with the table temperature range changing with makeup air, I suspect these AC on/off temperatures are either not set or set to a wide range, and this could be a place where a change may allow for more PSL cooling options.

We have used all the available balancing mass and need more.  We will bring more from the staging building and continue balancing in the morning.  Meanwhile, the ISI is unlocked and very unbalanced.  We will continue in the morning in an effort to at least get it reasonably lockable before we relinquish if not completely balanced before leaving it.

When we got started there was Baffle hardware to install and lots of cleanup.  As well, we marked the PR2 iris with an upside down dog-clamp and removed both irises.

TITLE: 11/13 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Purge air work took up the morning, and then a few crews went in. MC2 and PR2 WD have tripped, but I will wait for the SEI crew to finish the balancing before someone (not me) untrips it. Film crew is out in the LVEA with Keita.
LOG:

• 16:18 Amber and crew out from LVEA
• 17:40 Patrick, Fil to EX to replace card
• 17:48 Jeff, Kentaro to Y beam manifold for camera work
• 17:52 Cheryl to LVEA to change PSL environment temp
• 18:16 Richard, Fil to LVEA to take pictures and measure
• 19:06 Koji to Optics Lab, OFI work
• 19:14 Bubba taking the film crew in the snorkel lift in the LVEA
• 20:50 Jeff B to EX,EY to check on dust monitor vacuum system
• 21:24 Terry to LVEA Squeezer Bay
• 21:25 Travis to LVEA to grab and pic equipment
• 21:30 Jeff B back
• 21:39 Patrick to EX
• 21:56 Purge air work complete, Hugh to HAM3 to balance
• 22:08 Patrick back, Jim to HAM3
• 22:43 Bubba and Mark to EY
• 22:44 Fil, Marc to LVEA to move some cables, they will need to use the roll up door for a few min.
• 22:50 Betsy to LVEA to clean up and prep parts
• 22:56 Keita and film crew to LVEA
• 23:58 Travis, Betsy out
• 23:59 Cheryl to PSL

Laser Status:
SysStat is good
Front End Power is 35.82W (should be around 30 W)
HPO Output Power is 153.0W
Front End Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 0 days, 0 hr 2 minutes (should be days/weeks)
Reflected power = 22.43Watts
Transmitted power = 45.97Watts
PowerSum = 68.4Watts.

FSS:
It has been locked for 0 days 0 hr and 2 min (should be days/weeks)
TPD[V] = 1.931V (min 0.9V)

ISS:
The diffracted power is around 4.2% (should be 3-5%)
Last saturation event was 0 days 0 hours and 1 minutes ago (should be days/weeks)

Possible Issues:
PMC reflected power is high

Notice: Purge air work this morning, no in chamber work till this has completed. Should be complete this afternoon.

BSC arm removal to happen this morning during the purge air work, cover will stay on.

Squeezer Bay will still be intermittent laser hazard.

IO - IMC bypass planned to go in this afternoon/tomorrow morning. MC2 & PR3 are rubbing and they will revisit, alignment looks good.

OFI still a wip in lab.

ITMX --> PR3 Aux beam still set up.

Hugh ready to balance HAM3 when time permits. Half a day, few hours is lucky.

TCS tables are still being worked on by Greg.

GV6 is still closed, leak checking has finished.

Tues. Maintenance:

• CDS- Some DAQ reboots.
  • OPS please check the alignments after the reboots.
• HVAC work in OSB, but not in LVEA. Labs and Control Rooms. Work may continue throughout the week, they will try to keep stable temperatures.

Make sure to continue to do FAMIS tasks, and remember to close the task from the dropdown menu.

Trends all look normal for the most part. Temperature trends show an ongoing effort to stabilize for alignment work.

TITLE: 11/13 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 10mph Gusts, 8mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.55 μm/s
QUICK SUMMARY: Vent work continues

Looking into PSL temperatures, I started looking at the AC temperatures, and what I see is that the signals for TBLS and ACS appear to be switched.  Attachment shows from left to right:

• left: TBLN (blue) and TBLS(red)
• middle: TBLN (blue) and TBLS(red) and ACS(black)
• right:  TBLN (blue) and TBLS?(black) and ACS?(red)

Issues with Commissioning mode and issues with Science mode led me to try a new mode, which is Commissioning mode with Makup Air turned down from 100%.

• 13:52 - turned makeup air to 50%
• ~14:10 - turned makeup air to 30%
• 15:54 - North went above 23C, the setpoint for the AC that's set inside the PSL - picture attached
• 15:52 - turned makeup air to 40%

Leaving it set at 40% - JeffK is watching.

Gerardo stated that the Optical Table was not very level using a small T-Level and that the OFI needed adjustment to hang properly after doing all the adjustments on an optical table bench.

So I used the Optical Auto Level to look at the table.  With seven shots, above the walls at every corner and in the center of the table, the range of level was +-0.1mm--very level in our books.  I did manage to tie it into our LVEA monuments to put an actual elevation on the table: -325.8mm Lz.  Adding the -0.3mm conversion from local the global gives -325.8mm Gz (See T1100187.)  Looking at D0901129, it shows the Optical table to be 325mm below the BEAM TUBE CL.  I can't tell or remember if this is below the HAM5 BT CL or below the BSC2 BT CL where global 0 0 0 is positioned.  Either way, we are within 0.5 to 0.8mm of ideal elevation for this Optical Table and again very level.  Frankly, I'm relieved!  Attached are my field notes.