This afternoon I removed the lock from and re-enabled the PSL/IOO rotation stage, as stated in LHO WP 7263, for commissioning of the IMC prior to alignment activity in HAM6. This completes WP 7263.
TITLE: 01/03 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: Starting to hook up the tables and cables from the CS vent, and prep at EY for its vent. SEI crew is has been working on HEPI at HAM4 and EY. Jeff K has ran measurements and cleared all of the large suspensions in HAM2/3 (ie. MC's & PR's). We will be going laser hazard shortly and commissioning work will begin on the IMC.
LOG:
Today I restarted the PSL after it was purposefully shutdown for the duration of the holiday break. The HPO and 35W FE restarted with no issues, but I did run into an issue while injection locking the two lasers; the injection locking was very unstable. To ensure the system was at thermal equilibrium I let it warm up for the morning and roughly half of the afternoon before investigating the instability. By 20:00 UTC (12:00 PST) the injection locking had become more stable, but was still having occasional relocks. I lowered the ILS gain voltage from 1.0 V to 0.5 V (this is actually a gain increase) and things became more stable. I also noticed that the SR560 used to boost the low frequency gain of the ILS servo was saturated; I could not get it to clear at the time. Checking on things again at 22:00 UTC (14:00 PST), the injection locking had stabilized further. As a double check I looked at the PDH error signal for the injection locking and saw no issues there; this required me to unlock the ILS to see the error signal. Upon relocking the ILS things looked much more stable, and at about this time I also noticed that the SR560 was no longer saturating. I turned on the TFIN for the ILS (the signal path we use to boost the ILS low frequency gain) and the signals looked much better. I left it in that state to continue to warm up for the rest of the afternoon. As of 23:54 UTC (15:54 PST), the system looked stable and operating normally. At this point in time I re-enabled the power watchdogs.
I re-enalbed the PMC, FSS, and ISS at ~23:00 UTC (~15:00 PST). All 3 came back without issue. I will continue to monitor the system, but as of right now everything appears to be running normally.
I also took this opportunity to do the weekly PSL FAMIS tasks during the morning.
HPO Pump Diode Current Adjustment (FAMIS 8455)
With the ISS still OFF, I adjusted the pump diode operating currents and temperatures this morning as part of the PSL restart. The changes are summarized in the below tables and a screenshot of the PSL Beckhoff main screen is attached for future reference.
| Operating Current (A) | ||
| Old | New | |
| DB1 | 53.7 | 53.9 |
| DB2 | 55.4 | 55.6 |
| DB3 | 55.4 | 55.6 |
| DB4 | 55.4 | 55.6 |
| Operating Temperatures (°C) | ||||||||
| DB1 | DB2 | DB3 | DB4 | |||||
| Old | New | Old | New | Old | New | Old | New | |
| D1 | 26.5 | 26.0 | 19.5 | 20.0 | 20.5 | 21.0 | 22.0 | 21.5 |
| D2 | 26.5 | 26.0 | 19.0 | 19.5 | 24.5 | 25.0 | 19.5 | 19.0 |
| D3 | 26.5 | 26.0 | 20.0 | 20.5 | 24.5 | 25.0 | 21.0 | 20.5 |
| D4 | 26.5 | 26.0 | 18.0 | 18.5 | 21.5 | 22.0 | 19.5 | 19.0 |
| D5 | 26.5 | 26.0 | 18.0 | 18.5 | 25.5 | 26.0 | 21.5 | 21.0 |
| D6 | 26.5 | 26.0 | 18.5 | 19.0 | 20.0 | 20.5 | 21.5 | 21.0 |
| D7 | 26.5 | 26.0 | 19.0 | 19.5 | 21.0 | 21.5 | 21.5 | 21.0 |
At the time of adjustment the HPO was outputting ~154.5 W; this was at roughly 18:30 UTC (10:30 PST). This completes FAMIS 8455.
PSL Power Watchdog Reset (FAMIS 4586)
I turned on both PSL power watchdogs at 23:54 UTC (15:54 PST). This completes FAMIS 4586.
As we prepare to align the IMC and IOT2, we may want to increase the laser power injected into the vacuum from the few hundred mW that we've been at for a few months up to a couple Watts. There was some concern that we want to ensure that we're not going to harm anything in HAM6, since it is still at atmosphere and the trigger PD for the fast shutter is not currently plugged in. There shouldn't be any problem however. I have got the ITMs, PRM and SRM misaligned so that we're not getting any PRMI flashes and no beam is going to HAM6. Please leave the ITMs, PRM and SRM misaligned.
Even if the PRMI were to flash, nothing in HAM6 is aligned, so there should be no beam on any PDs or on the OMC. Also, the PDs would be able to handle that much power, vacuum or atmo. Given the gross misalignments, the likelihood of the OMC resonating is vanishingly small.
With the recycling mirrors misaligned but the ITMs aligned (so just transmission through optics, no resonant flashes) the max amount of power going to HAM6 is 3mW for every 1W of injected light (3% transmission through PRM, 25% for 2 BS passes, and 35% for the SRM). We do not intend to go higher than 1W or 2W, which would put about 6mW at HAM6. However, it is conceivable that the rotation stage could let up to ~50W into the vacuum, in which case we'd have 130mW of light at HAM6. Not insignificant, but still should be fine.
So, we are software ensuring that no beam is going to HAM6 while we use about 2W of PSL power, but even if some of the optics get re-aligned it'll all be fine.
Before going to high power with PRM misaligned, one needs to check that the reflected beam still hits the beam dump on top of HAM2.
FAMIS6556
Added 100mL to the crystal chiller.
Software commissioning is ramping up, so I'm restarting the regular restart alogs.
model restarts logged for Mon 01/Jan/2018 No restarts reported
model restarts logged for Tue 02/Jan/2018
2018_01_02 13:31 h1lsc
2018_01_02 13:31 h1omc
2018_01_02 13:31 h1sqz
Model changes to lsc, omc and sqz (no DAQ restart needed). Also restarts of h1ecat[x1,y1] and h1hwsmsr[1] (not shown).
FAMIS6931
For what it is worth while we have work ongoing while we finish up the corner vent and start ET soon, here are the CPS noise spectra.
The scripts reported that the BS and ETMY had some higher noise.
TITLE: 01/03 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: 5mph Gusts, 4mph 5min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.47 μm/s
QUICK SUMMARY: Plans for today include prep for EY vent and CS commissioning health check, SEI HEPI unlocking and EY locking, getting TCS/HWS back online, and CDS still pulling cables.
(Chris S, Kyle R, Gerardo M)
The viewport ASSY-D1700340-001 was installed on A2F4 of HAM5 on December 22 of last year, the conflat joint at this door still needs to be leak checked.
A viewport protector D1200873 was installed with a shiny red metal guillotine D1400106. To finalize the assembly a yellow protector was used.
Both ZnSe windows were inspected per E1100948:
Part number D1100439 SN017, no notable defects were noted for both faces.
Part number D1100485 SN016, no notable defects were noted for both faces.
Metal components were also visually inspected concentrating on "sealing" surfaces, such as knife edge and o-ring seat for part D1700338.
For the other 2 metal caps (D1700339 and D1700342) the o-ring seat surface was inspected.
The viton o-rings, PEEK shims and KAPTON shim were also visually evaluated.
After all components had been inspected the assembly was complete per D1700340.
The viewport was inspected and tested per E1100948, after proof testing was done the test cap was removed to proceed with a successful leak testing. Second ZnSe window was installed per D1700340.
Attached are two photos of the testing setup, notice the tight fit on the test cap for the different lines, but managed to fit all including a pressure relief valve, vent valve, inlet line and pressure gauge line.
I've installed a Watec camera/lens combo on the HAM2 West door, which looks at the baffle downstream of IM1, IO straight baffle HA1. In order to get a view of the baffle, I used one of our camera housings that sits at an angle to the viewport, and is smaller in diameter than the viewport. The new position of IM1 (it moved in the +X and -Y directions) and the new Viton under the SiC baffle on IM1 combine to reduce the view of the aperture on HA1. The edge of the aperture that's closest to IM1 is so close the the IM1 SiC baffle that it's not clear to me that all of the front edge of the baffle aperture is in the camera view, however the baffle is thick, and I can identify the back edge of the baffle aperture on that side. The mounting system inside the camera housing cannot move toward the viewport even if all screws were to loosen, and the camera/lens combo is on a swivel ball head and is mounted so that in every possible position the lens cannot reach the viewport. The camera view is rotated 90 degrees. The first attached image is rotated to correct that, and the second image is true to what is seen on the CRT display, with +Z direction being toward the right in the image, and the third image is a full res image of the aperture (large file, also corrected for +Z = up).
Hooked CO2 table back up to the chiller lines. Had to use new tubing as the old ones wouldn't reach the pipe anymore. Took the opportunity to look at contamination in the laser cooling lines, Pictures attached. The wipes were inserted into the elbows and run around, you can see what looks like corrosion deposits that rubbed off, as well as some plastic or metal chips. I then blew some air through the chiller lines of the laser, which moved through apparently unencumbered so that was a good sign. I'm not sure why that larger contamination wouldn't be caught by the sock filters on the chillers, it may be there isn't enough flow velocity to move them out of the nooks and crannies. If there was this much in the larger lines I can definitely see why the smaller lines like the AOM were having problems with contamination then.
Valved-in HAM1 500 L/s ion pump and pumped in parallel with Turbo for a few hours -> Isolated turbo and eventually shut down turbo after IP demonstrated ability to survive unassisted. Energized IP1, IP2 and IP3 while assisted by pump carts -> Isolated and then shut down pump carts after IP's demonstrated ability to survive unassisted. Valved-in GV5 AIP pump cart -> annulus volume at high pressure due to YBM vent and known inner O-ring leak -> Energized GV5 AIP controller and will pump volume with IP and pump cart overnight. Still need to climb on IMC and OMC tomorrow to disconnect connected pump cart hardware.
Noticed that the two relatively new full-range, hot cathode ion gauges on corner volume exhibit strange behavior at a pressure between 5e-6 and 6e-6 Torr. Last Friday PT-180 suddenly fell in pressure (no one on site making changes to vacuum systems). Today when cycling turbo valves (for leak checking), PT-170 suddenly dropped in pressure. Kyle noted something peculiar with PT-525 at EX on Aug. 31, 2017 after TMDS discharge activity (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=38471). Will contact Inficon for an explanation.
Helium leak checked the joints listed below via the new Inficon UL1000, backing vertex turbo, while X/Y-BM turbos were valved out. The background started at 6e-9 mbar-L/s and drifted to 1.4e-8 mbar-L/s after valving out other two turbos, likely from cross talk due to relatively high volume pressure. No leaks found above this background.
Today we restarted h1hwsmsr and h1fwsmsr1 for Thomas Vo in an effort to get them to detect their cameras.
