TITLE: 02/13 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:
LOG:

• 1508 Bubba, Mark to LVEA to remove HAM6 S door
• 1613 Christina to LVEA
• 1633 Jeff B and Peter to PSL enclosure
• 1634 Chris and pest crew to EY, done at CS
• 1645 Fil to EX to start WP#7345
• 1646 Bubba, Mark out
• 1648 Jason to PSL enclosure
• 1701 Ed to LVEA to work on the TCS power supply
• 1701 Norco truck at gate going to 8514375
• 1701 Marc to MY
• 1704 Peter out
• 1718 Jeff K and Travis to EY to resume violin measurements
• 1730 Marc back
• 1734 Peter to PSL enclosure to drop off a tool for Jeff B
• 1736 Fil back
• 1738 Dave restarting OAF model
• 1743 Sheila, Terry to Opt Lab
• 1759 Ed out
• 1804 Betsy to EY
• 1805 Karen to MY
• 1810 Jason, Jeff B out
• 1822 Ed, Fil to CER
• 1840 Fil to EY to join the crew there
• 1852 Karen leaving MY
• 1910 Marc to CER
• 1921 Jeff K, Fil back from EY
• 1932 Marc out
• 1940 Sheila, Terry out
• 1957 DAQ reboot
• 2015 Travis and Betsy back EY
• 2101 Sheila, Terry to Opt Lab
• 2123 Ed to CER
• 2131 Marc, Richard, Fil to EX
• 2132 Travis and Betsy to EY
• 2207 Jason, Peter to PSL rack
• 2210 Nutsinee to Opt Lab then SQZ Bay
• 2221 Marc, Richard, Fil back
• 2238 Fil to CER to swap some cables for more ITMY investigation. Suspension brought to SAFE and SEI to DAMPED
• 2240 Marc to EX to repair demod chasis
• 2309 Marc back
• 2310 Nutsinee out
• 2314 Jason, Peter out
• 2325 Sheila, Terry out
• 2348 Jason, Peter ro PSL racks
• 2358 Nutinsee to SQZ Bay

J. Kissel, T. Sadecki, B. Weaver

Betsy and Travis are beginning to resurrect the top mass OSEMs on the newly re-suspended H1 SUS ETMY. In doing so, they've found R0 F2 OSEM's Test/Coil Enable BIO Frozen in OFF Position. Toggling the test/coil enable (TCE) state from 0 or 1 moves all of the rest of the R0 TCE switches, but F2's remains in the stuck position. This could be either the readback stuck, which wouldn't be a priority to fix, or it could actually be the switch that's dead, which would be a major blocker for activity. 

I attach a screenshot of the M0 / R0 corner of the binary IO screen showing the problem.

Power cycle h1oaf0 in attempt to fix h1oaf overrun issue.

h1oaf0 was power cycled. The sequence was: kill models, take h1oaf0 out of the Dolphin fabric, power down cpu, power up cpu.

Note: no software was changed, no modified filter files were loaded.

The only restart issue was a brief IRIG-B negative excursion for h1iopoaf0, which invalidated the DAQ data and IPC channels for about 5 minutes.

Unfortunately, this does not fixed the h1oaf0 overrun problem (which started when h1ngn was decommissioned).

DAQ Restart

The DAQ restart was to:

use the latest H1EDCU_HEPIPUMPEX.ini

use a new H1EDCU_SEISMON.ini which I created from the new 6-eq_event code.

WP7346 Vacuum Alarms Reconfiguration

Chandra, Dave:

The cell phone alarm system was reconfigured to:

remove CP4 LN2 pump level alarms (value and error channels) from the system

increase CP4's vacuum gauge alarm level from 1.0e-07 to 5.0e-05 Torr.

The removal of CP4 LN2 pump data has impacted on the daily CP reports, which will require a code change later today.

   Made several changes to PSL Chiller manifold in preparation for the 70w amplifier change. 

   (1). Disconnected the HPO Crystal Chamber circuit from the oscillator. Connected the supply to the return to make a short termination loop. Installed a throttling valve on the return side for flow control. Not happy with how the termination loop is configured. Looking into ways to improve the termination loop run.

   (2). Removed the laser head circuit. Connected the supply to the return port to keep water circulating until ready to connect the 70w. 

   (3). Removed and plugged off an unused circuit. 

   (4). Upgraded all the main manifold supply and return plastic fittings with all 316 SS. 
       

   Changed Crystal and Diode filters in both the chiller room and in the PSL enclosure. 

   Crystal Chiller: Some darkening of the 0.5um filter in the enclosure. This darkening runs a bit more than half way up the filter, which means there was plenty of life left in this filter. There was a small amount of debris in the bottom of the filter. One was a small piece of metal,one small piece of what looked like some sealer material, and one bit of fuzz with a tail. This looked like plastic, perhaps from the installation. 

   The 1.0um Crystal chiller filter has some slight yellowing; but no debris of any size.   

   Diode Chiller: Both the 1.0um and the 0.5um filters showed no signs of any issues with this cooling circuit. Only a very slight yellowing of the 1.0um filter. NO debris in either filter.  

   After more than a year of continuous operations all four of these filters look great. The debris found the the 0.5um Crystal chiller filter is not significant. 

Closing WP #7337      

This morning at 9:20am local I reduced CP4's LLCV setting to 0% open to cut off LN2 flow into pump reservoir. Kyle connected the HAM 6 backing cart with safety valve to CP4's turbo and will valve in turbo this morning before the pump warms up too much. Currently CP4 is at 58% full. Dave B. readjusted text/email alarms.

Mark D. is removing insulation from GN2 lines - sections that fall within bake inclosure.

Ken is removing electrical conduit, wiring, and supports and will continue this work throughout the week.

Kyle and Gerardo are stripping GV 11,12 of its wiring, controllers, annulus piping, etc.

I'm working with bake enclosure contractor on last minute "gotchas."

J. Kissel, T. Sadecki

Travis and I used a HeNe Laser, QPD, and speaker array to begin characterizing H1SUSETMY's PUM-to-TST fused silica fiber violin modes. We were able to complete the characterization of 3 of the 4 fibers, but we began to have (we believe to be) electronics problems during characterization of the last fiber, so we've left the set turned off but otherwise as is, in hopes the the gremlins will go away by tomorrow morning to characterize the final fiber.

I've exported the data, and intent to process it in detail as I've done for ITMX (see LHO aLOG 39163), but for now preliminary results are as follows (under the "Answer" column):

Freq resolution 62.5mHz
(400 lines with 25 Hz span)

+X / +Y (S1400157; Partial Suspended Fundamental: 504.5 Hz)

	Freq Band / Hz	Answer / Hz	nAvgs	Exc Amp / mV		FileName
1st 	490 515		504.8 		10 	250 		0003
2nd 	990 1015	999.8125	10	250 		0004
3rd	1460 1485	1471.3125	10	250		0005
4th	1975 2000	1980		10	250	        0006
5th	2450 2475	2460.3125	10	500 		0007
6th	2925 2950	2939.625	10	500 		0008

-X / +Y (S1400159; Partially Suspended Fundamental: 503.0 Hz)

1st	490 515		503.625		10	500		0009
2nd	990 1015	1000.3125	10	500		0010
3rd	1460 1485	1470.375	10	500		0011		
4th	1975 2000	1979.4375	10	500		0012
5th	2450 2475	2459.4375	10	500		0013
6th	2925 2950	2939.375	10	500		0014

+X / -Y  (S1800486; Partially Suspended Fundamental: 513.25 Hz)

1st	500 525		512.75		10	500		0015
2nd	1000 1025	1016.8125	10	500		0016	
3rd	1490 1515	1500.375	10	500		0017
4th	1975 2000	1979.5625	10	500		0018
5th	2450 2475	2459.375	10	500		0019
6th	2925 2950	2939.3125	10	500		0020


So far, the difference between fully suspended and partially suspended values look consistent with the ~0.5 Hz shift down in frequency as seen on ITMX.

Note, we tried upgrading the HeNe laser to a spare fiber-coupled optical lever laser as requested by Angus in LHO aLOG 40300, but the output coupler we were given collimated the beam to much larger than we needed (a ~10mm beam for a ~3mm QPD). Also, we were seeing a large amount of glitch-like impulses while taking the ASD of the QPD SUM output. A scope, time-series reading of the QPD output showed no glitching at any time scale. Suspecting the new laser, we tried out the old, supposedly noisy one. Simultaneously, I found that the SR785 input settings were DC coupled, and switched to A-B with AC coupling. Either the laser swap or the AC coupling fixed the problem, but since we were on a roll, we didn't switch back to the new spare optical lever laser. All of today's measurements were taken with the old HeNe laser.

Evan G., Jeff K.

We moved a compensation zero out of the ESD output filter bank for each quadrant that had generated an uncompensated 5.2 kHz pole in the DARM loop (see LHO aLOG 33927). This resulted in an effective delay of ~20 usec. There is adequate roll off already from a low pass filter in the ESD driver, so moving this out of the DARM loop will be minimally impactful. Instead, the compensation zero will be a compensation pole in the CAL-CS path and doesn't result in an additional 5.2 kHz zero being added to the Foton filter.

We leave the filter in place and turned on, but the design string is now simply zpk([], [], 1, "n")

The new filter is installed in CS_DARM_ANALOG_ETMY_L3, FM5: zpk([], [3245.33075], 1, "n") (this comes from the mean of the summing node poles, see 27619)

Removing this from the DARM path means that we need to include these as an uncompensated poles in the DARM model and reduce the unknown actuation delay by 20 usec. This will bring the unknown actuation delay down to ~40 usec.

see WP #7343 

1630 hrs. local -> Lowered CP4's level via CDS PI control set point to 70% down from 75%.  I expect this new pump level value should be reached prior to my leaving tonight.

Will start tomorrow morning with step 2 of WP #7343 (as step 1 was done this weekend).  Delay is the result of competing employee requirement/task in addition to my desire to complete construction of a relay box that will act as a second interlock and isolate the scroll pump as a function of foreline pressure.  As is, the foreline isolates only at the absence of 120VAC as seen by the scroll pump motor windings (i.e. one layer of protection - prefer two layers).  

Cross-posting from LLO alog here: https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=37737 

Today, I knocked out the jig calculations for the AERM07 prism placements and updated the spreadsheet for all 4 new AERMs (05, 06, and 08 have been finished, spreadsheet E1000828).  Gerardo did a quick spotcheck of my work, then I went to the lab and glued the first prism on (specifically "180 ARM").  The EP30-2 epoxy is a newly procured vial and passed the usual pre-bake test, as usual.

TITLE: 02/12 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: PSL was shut down and 70W amplifier work began. More work continuing down at MY for CP4. Team SUS working on ETMY. And SQZ crew is prepping for next week's install.
LOG:

• 1602 Mark to LVEA to change out nitrogen bottle
• 1612 Mark out
• 1619 Terry to SQZ Bay
• 1730 Christina, Karen, Vanessa to LVEA
• 1741 Peter to LVEA to transition to laser safe
• 1743 Jason to LVEA
• 1753 Corey to optics lab
• 1754 Jason out
• 1758 LVEA is laser SAFE
• 1800 Terry back out to SQZ Bay and optics lab
• 1810 Peter, Marc out of LVEA and headed to MY
• 1817 Ed to SQZ Bay to talk to Terry
• 1821 Jason to PSL enclosure
• 1829 Travis, Fil to EY for ESD checks
• 1837 Peter, Marc back
• 1841 Jeff B to PSL enclosure
• 1842 Corey dropping off part to SQZ Bay, then out
• 1921 Peter to PSL enclosure to drop off valves for Jeff B
• 2031 Jason and Jeff B out for lunch
• 2049 Jeff K and Travis to EY for violin measurements
• 2113 Karen to MY
• 2143 Karen leaving
• 2145 Jason to PSL enclosure
• 2203 Bubba to LVEA
• 2210 Bubba out
• 2229 Nutsinee to SQZ Bay
• 2248 Jason out
• 2307 Ken done at MX

Given that we have no laser light, confirmed by images of the PSL and cameras looking into HAM2, I set the PSL ISS Second Loop Array QPD dark offsets.  I accepted the values into SDF, and also had to accept the offset switch being on for all 4 segments, and I've confirmed that these offsets were zero in Feb 2017, during O2.

OFFSETS: Seg1 = 0.180, Seg2 = 0.180, Seg3 = 1.540, Seg4 = 2.370, and the SUM, which had been at +4.2, is now oscillating around zero.

I put an offset of -2.0 on the SUM to prevent it from going negative.  I tried using -1.0, but the pitch and yaw signals were still occasionally railing +/-32K.  The SUM during Feb 2017 reached 60K counts, so an offset of -2.0 is small.

Changes are recorded in the attached screenshot:  Left side shows current settings, rich side shows a snapshot of the QPD segment settings as found (zeros).

I came in to do some last DRMI/PRMI tests, and found the laser is off.  This happened about 4:15 am pacific time.  THe epics channels don't show any problems with the chillers, and it looks like the power watch dog tripped after the laser went off. (screenshot attached)

This afternoon Georgia and I locked PRMI and ran a2l for PRM, PR2, and PR3.  

There is a file called by the a2l scripts (for the matrices) that is no longer in the place it used to be.  We added the ads matrix to the list of matrices used in ISC_library, so that these scripts now import and use that.  

[For the commissioning team]

We did a quick measurement of the loss in the x-arm after improving the pointing into the cavity using IM4 and PR2.

It is important to note that there were no angular loops closed when doing this measurement, so the power build up wasn't optimized ( LSC-TR_X_QPD_B_SUM ~ 0.95).   We were running short on time and verified that the DC angular alignment was good enough so that the locked vs unlocked state gave us a big enough dip to estimate a visibility.  

Comparing the above numbers to alog-38493. They are close, but I can't say anything definitive about the change in loss between the two ITMXs (before and after swap), we can redo this measurement when we have more time to close angular loops (and maybe try a more sophisticated loss measurement).  Also important to note, mode-matching contributes to the loss as well and this is not taken into account with this measurement.