Quarterly greasing and rotation of VEA AHU fans was completed yesterday. There is a report that one fan is noisier than normal. This is likely due to a failing bearing. Eric is investigating. T. Guidry C. Soike E. Otterman
TITLE: 10/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 3mph Gusts, 1mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.11 μm/s
QUICK SUMMARY: NPRO swap continues today. A few dust alarms that quickly dissipated, but no other alarms active.
R. Short, J. Oberling
As written in Jenne's alog here, upon finding the spare PSL NPRO SN1661 does not show the glitching we've been seeing with NPRO SN7974 we begsn swapping the PSL NPRO this afternoon. We started by removing NPRO SN7974 and our glitch test setup, then installed NPRO SN1661. We immediately noticed the readbacks in PSL Beckhoff were slightly wrong, meaning we need to adjust the potentiometers on the power supply's internal board that provides these readbacks. With an injection current of ~0.9 A, which gave an output power of ~32 mW, we roughly aligned the beam to our alignment irises that sit between M02 and M03, using M01 to align to the first iris and M02 to align to the second. We did remove the PSL EOM and lens L01 from the beam path; the EOM will be reinstalled once we have a mode matching solution, and L01 will have to be changed to a new lens (the current f=167mm lens installed for L01 gives us an uncomfortably small beam in the area of the EOM crystal). We then set a power meter after M02 and turned up the NPRO injection current until the power meter read ~1.8W; the injection current is 2.144 A. WP13 (a QWP) and WP14 (a HWP) were adjusted to maximize the power read by the power meter (these 2 waveplates serve as polarization clean up for the naturally slightly elliptical polarization of the NPRO beam). We started with ~1.806 W and ended with ~1.814 W. Moving the power meter to the output of the NPRO we measured ~1.86 W, so we're losing roughly 46 mW to wrong polarization. We then calibrated the PSL Beckhoff reading for the NPRO power monitor PD, as well as the channel H1:PSL-PWR_NPRO_OUT_DQ that is also connected to this PD; these now read correctly at ~1.86 W.
We left the NPRO running overnight, so there will be more data collection for looking for glitches, although we also did not see any while working in the PSL enclosure this afternoon. The enclosure environmental controls are also running, but the lights are off.
On deck for tomorrow:
TITLE: 10/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
INCOMING OPERATOR: Tony (cancelled for maintenance)
SHIFT SUMMARY:
IFO is in NLN and MAINTENANCE. IFO will be DOWN for coming few days (estimated 2-3).
Extremely busy 8 hour maintenance day. The main events were the start of earth moving for the new LHO building, the PSL laser NPRO swap and the CO2Y Laser Swap. Details on all maintenance activities below.
LOG:
Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
---|---|---|---|---|---|---|
16:36 | SAFETY | HAZARD | LVEA | YES | !!!!!LVEA IS LASER HAZARD!!!! | 03:16 |
15:11 | 3IFO | Nichole, Christina | LVEA | YES | 3IFO Audit and Inventory | 17:39 |
15:13 | FAC | Kim | EX | N | Technical Cleaning | 16:54 |
15:13 | FAC | Karen | EY | N | Technical Cleaning | 16:26 |
15:14 | FAC | Nelly | FCES | N | Technical Cleaning | 16:01 |
15:14 | VAC | Gerardo | FCES | N | Clean air compressor run | 16:22 |
15:16 | FAC | Chris, Eric | EX, EY, MX, MY | N | Quarterly grease and rotation of VEA AHU supply lines | 16:03 |
15:17 | TCS | Camilla | LVEA, Mechanical Room | N | CO2Y Laser Swap Check | 15:36 |
15:18 | VAC | Jordan | MY, EY | N | Quarterly turbopump functionality tests | 18:32 |
15:34 | PSL | Ryan S | Optics Lab | Local | Getting spare laser in prep for PSL work | 15:40 |
15:37 | TCS | Camilla | LVEA | YES | CO2Y Laser Swap | 20:22 |
15:52 | PSL | Jason, Ryan S | PSL Room (LVEA) | YES | NPRO Spare Install | 19:12 |
16:04 | FAC | Chris, Eric | Mechanical Rm | N | Quarterly grease and rotation of VEA AHU supply lines | 16:53 |
16:14 | SAF | Safety Committee | LVEA | YES | Safety Committee walkabout | 17:00 |
16:17 | ALS | Keita | EX, EY | YES (will turn on and off) | ALS Cable Work on X/Y PDH | 18:29 |
16:20 | VAC | Janos | MX, EX | YES (EX) | Turbopump maintenance | 19:12 |
16:32 | CDS | Erik | EY Mech Room | N | DC Power Supply Replacement for CNS-II GPS Unit | 17:27 |
16:38 | EE | Fil | LVEA | YES | Biergarten SEI Guralp sensor huddle tests (cabling) | 18:38 |
16:39 | TCS | TJ | LVEA | YES | CO2Y Laser Swap | 20:22 |
16:51 | FAC | Earth Movers | Behind Staging Building | N | Moving the earth | 23:40 |
16:55 | FAC | Karen, Kim | LVEA | YES | Technical Cleaning | 18:15 |
17:01 | SAF | Safety Committee | EX, EY, MX, MY | EX, EY Temp Hazard | Safety Committee Walkabout | 21:15 |
17:40 | 3IFO | Nichole, Christina | MX, MY | N | 3IFO Audit and Inventory | 18:40 |
17:55 | FAC | Chris | Optics Lab | Local | Fume Hood Dissassembly | 18:55 |
20:12 | VAC | Gerardo | FCES | N | Clean air compressor work | 20:37 |
20:13 | 3IFO | Christina, Nichole | MX, MY | N | 3IFO Audit and Inventory | 23:25 |
20:33 | TCS | TJ, Camilla | LVEA | YES | CO2Y Laser Swap | 22:54 |
20:58 | PSL | Ryan S, Jason | LVEA | YES | NPRO Swap | 02:58 |
21:29 | SQZ | Sheila, Vicky | LVEA | YES | SQZ beam profile of beam pump | 22:48 |
22:05 | EE | Fil | LVEA | YES | Biergarten SEI Guralp sensor huddle tests | 01:10 |
TJ, Camilla, Fil.
WP12142, Table layout: T1200007. Swapping because current CO2Y laser was at the end of it's gas life and slowly deteriorating, details in 79560. Prep done in 80679.
Still to do:
TJ, Camilla
Checked the pointing of CO2Y on ITMY using the annular mask and HWS, as in 68391 by injecting ~2W of CO2 after we could see the beam was mostly centered. The IFO beam is ~centered on the origin cross, checked in plot from 80148.
HWS plot is attached as the CO2 was heating and cooling ITMY, we decided that this was well aligned enough not to pico. It's possible these a little more beam in the lower left of the HWS image but the FLIR images yesterday looks the same as before the swap.
WP12150 Replace EY DNS-II GPS receiver power supply
Erik, Fil:
The power supply for the CNS-II GPS receiver was replaced. Erik found that the unit needs to be unplugged for at least 30 seconds or it doesn't initialize correctly.
WP12123 Install python3 alarms system as production
Dave:
The new python3 alarm code, which also uses Twilio for cell texts, was installed as the production code on cdslogin.
WP12145 h1guardian1 reboot
Erik, Jonathan, TJ:
h1guardian1 was rebooted to test the new boot drive which was installed recently. Please see Erik's alog for more details.
WP12151 Correcting missing channels in SDF snap files
Dave:
h1susitmpi's OBSERVE.snap was missing 4 channels. Since its settings were identical to those in safe.snap, OBSERVE.snap was changed to be an identical symlink as safe.snap
lrwxrwxrwx 1 controls advligorts 65 Oct 22 10:11 OBSERVE.snap -> /opt/rtcds/userapps/release/sus/h1/burtfiles/h1susitmpi_safe.snap
lrwxrwxrwx 1 controls advligorts 65 May 2 2016 safe.snap -> /opt/rtcds/userapps/release/sus/h1/burtfiles/h1susitmpi_safe.snap
The HEPI models h1hpietmy, h1hpiham4, h1hpiham5 and h1hpiham6 had safe.snap files were all missing the same 9 channels (see attachment).
These channels were added to the safe.snap files. To test, each models' SDF was transitioned from OBSERVE to safe and back to OBSERVE.
1. Temporary AO/AI connection to end station PDH CM board
Since ALS locking could be a time sink at times, and since going to the end station each time we want to make PDH measurement is a pain, I made the following changes.
CM boards:
Used to be connected to | Is connected to now | |
IN2 of the PDH CM board | Nothing | H1:LSC-[XY]_EXTRA_AO_2 |
OUT2 of the PDH CM board | Nothing | H1:LSC-[XY]_EXTRA_AI_2 |
IN2 of the PLL CM board | IN1 of the PDH CM board (EX, T-ed off), didn't make sense or IMON of the IQ Demod (EY), didn't makessense |
Nothing |
Note that A=1000 sinusoidal excitation in AO results in 115mV RMS (measured at EY).
2. EY: Connecting DC output of the green PDH diode to H1:ALS-Y_REFL_B_LF
H1:ALS-Y_REFL_B_LF, which is supposed to be recording the first PD on Matt's PD interface box inside the ISCTEY, has been recording noise. I connected the DC output of the green PDH diode to the first channel on Matt box with the gain of x1.
(Before this change, the DC output of the green PDH diode was found to be routed to the "TEST" TNC feedthrough inside the enclosure on the same feedthgough panel as the RF output and DB15. There was no connection from "TEST" to anywhere outside the table enclosure.
Also, the first channel of Matt box has a cable called "ISCTEY-ALS-PD6" together with a cable for DC supply, but the other end of that cable was just dangling in air over the NPRO.
I disconnected the PDH diode DC output from the feedthrough panel and rerouted it to the ALS-PD6 cable that is still dangling over the NPRO. Since I didn't have a BNC barrel I used a T. Not too proud but it should be working, see the picture.)
3. EX: Could not find where the DC output of the green PDH diode cable goes.
Like EX, H1:ALS-X_REFL_B_LF have been recording noise. The first channel of Matt box doesn't have any cable connected.
However, unlike EY, the DC output cable of the green PDH diode seems to go to somewhere inside the sea of cables on the cable tray in the direction opposite to the "TEST" feedthrough. The cable was tied to the tray using multiple cable ties together with other cables rather tightly and I couldn't find where the other end was. I gave up as I wasn't ready to undo all cable ties on the tray.
[Writing on behalf of Jason and RyanS, who are actively working on the NPRO swap]
TL;DR: We're beginning the process of swapping for a spare NPRO.
This morning, Jason and Ryan went into the PSL enclosure and mounted a spare NPRO (they will remind me of which serial number later) on the PSL table, and cabled it up. They moved the PD that serves H1:PSL-PWR_NPRO_OUT_DQ over near that spare NPRO and used a spare pickoff mirror to direct a small amount of power from the spare NPRO to the PD. This test was to see if the spare NPRO exhibits glitches in the same way that the original NPRO does. We had decided yesterday at the commissioning meeting that if the spare NPRO, after having sat for ~2 hours, does not exhibit glitching behavior, that we would go ahead with the swap.
In the attachments, blue ndscopes are of the original NPRO, that has been in service for all of O4 to-date. The pink ndscopes are the spare NPRO, in this test setup.
With the original NPRO, you can see a signal when the door to the laser room opens and closes, and also you can see some glitches that are the same order of magnitude as the door. This gives me some confidence that if we do see the door with the spare NPRO, then we should be able to see glitches if they are there. With the spare NPRO and pickoff, the signal on the PD is much lower. However, you can still see when the door opens and closes. We let the laser sit for about 100 minutes, and didn't see any obvious glitching.
Since this spare NPRO is not obviously exhibiting glitching behavior, they are beginning the process of putting in that spare NPRO.
We anticipate that this work will take a few days. We're doing it now since we can't lock during the daytime (due to excess ground motion this week), and LLO is offline for another few days pumping.
Last night, Jason and Ryan put the new NPRO into the main path, as the first step of the swap (alog 80829).
It does see a few occasional glitch-like features (see attachment), but they are (a) much less frequent than the old laser, and (b) no more than 1/2 size. Another factor to consider is that overnight, the PSL environmental controls were left on, so this is a noisier environment than we normally have. Also, no external servos (eg FSS) are engaged.
I've tried to make the y-axis about the same as the orig laser (blue) plots from yesterday, so that it's easier to see that these rare glitches are indeed much smaller than the ones on the old laser.
EDIT: Sheila and I looked at this plot, along with some others that Oli had created a few weeks ago, and it looks like these small 'steps' in the power that are shown here may be of the same type that we had with the previous NPRO. I'm still hopeful that they are smaller and less frequent though. But, these 'steps' may be part of the glitches that we're looking at.
Attached is a picture of the test setup. The spare we are using is SN1661; there is an alog coming at some point regarding the testing of the spares and our rationale for choosing this laser. This closes WP 12153.
The exercise was done to capture the internal temperature data from the compressor enclosure, done so with the system loaded, thus the entire system was turned ON, compressor and dryer with a "normal" demand, during this scenario both of the compressors were cycling in and out, taking turns. Then, a second short test was done, I opened the demand of the flow so as to keep both compressors running for 10 minutes, from 1:15 to 1:25 pm. Test was started at 8:18 and ended at 1:30 pm.
Work done under WP 12148, now closed.
A tabular formatted guardian overview MEDM, with the nodes arranged in alphabetical order, is now available from the CDS overview.
h1guardian1, the guardian server, was rebooted to test a new boot drive. This drive was hotswapped into guardian last week.
Some confusion was caused when guardian defaulted to boot off a drive from an older guardian server. This drive had been installed as a reference, but was no longer used.
In order to get h1guardian1 booting reliably, this drive was removed from the server.
J. Freed, S. Dwyer
Yesterday we did damping loop injections on all 6 BOSEMs on the PR3 M1. PR3 shows quite alot of coupling in the 10-25Hz range. This is a continuation of the work done previously for ITMX, ITMY, and PR2
As some signals were quite strong, instead of gain of 750, gains of 300 and 600 were collected (300 is labled as low_noise). Also, this time injections were performed in diaggui instead of awggui
The plots, code, and flagged frequencies are located at /ligo/home/joshua.freed/20241021/scrpts. While the diaggui files are at /ligo/home/joshua.freed/20241021/data. This time, 600 gain data was also saved as a reference in the diaggui files (see below), saved in 20241021_H1SUSPR3_M1_OSEMNoise_T3.xml
pr3.png Shows all results for PR3 with the top half being at 300 gain and the bottom being at 600 gain. All sensors showed strong coupling in 10-25Hz range at 600 gain. [LF, RT, T2, T3] showed strong coupling in 10-25Hz range at 300 gain. [SD, T1] instead showed some coupling in the 46-48Hz range at 300 gain. I am unsure if this is signifficant or another noise source while the test was performed.
Because of the failure of the CNS power supply at EX, which was the same age as the power supply at EY, and because of some glitches starting to occur with GPS 1 PPS signal from the CNS at EY, I replaced the power supply for the CNS at EY.
relevant alogs here:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=80742
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=80537
Tue Oct 22 10:11:21 2024 INFO: Fill completed in 11min 17secs
Gerardo confirmed a good fill curbside.
FAMIS 31056
Several things have happened in the past week that show on these trends:
TITLE: 10/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 6mph Gusts, 4mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.13 μm/s
QUICK SUMMARY:
IFO is LOCKING (but not for long). We have an 8 hr maintenance day today, expecting the following activities:
Workstations were updated and rebooted. This was an os packages update. Conda packages were not updated.
Sheila, Vicky, Camilla
We have turned back on the SQZ angle servo using the ADF at 322Hz. Last briefly tried while testing ADS alignment in ADS in 80194. Turned on ADF and used 'python setADF.py -f 322'. Then set H1:SQZ-ADF_OMC_TRANS_PHASE to get H1:SQZ-ADF_OMC_TRANS_SQZ_ANG close to zero and checked by stepping the SQZ angle that there is a zero crossing in the ADF measured SQZ angle, plot attached.
The servo adjusts the SQZ angle (H1:SQZ-CLF_REFL_RF6_PHASE_PHASEDEG) via keeping the ADF measured angle (H1:SQZ-ADF_OMC_TRANS_SQZ_ANG) at zero. Setpoint can be adjusted using the ADF phase (H1:SQZ-ADF_OMC_TRANS_PHASE).
Tagging Detchar: ADF is now on at 322Hz. It was turned all the way off in 79573 by Alan. We can adjust the frequency 50-500Hz if there is a better place for a line.
Note to operators: if you want to run SCAN_SQZANG, the ADF servo will now overwrite the sqz angle. So BEFORE going back to FREQ_DEP_SQZ you'll want to tweak H1:SQZ-ADF_OMC_TRANS_PHASE (via sqz overview > ADF) to make H1:SQZ-ADF_OMC_TRANS_SQZ_ANG close to zero. Or you can tweak H1:SQZ-ADF_OMC_TRANS_PHASE (via sqz overview > ADF) until the SQZ BLRMs/ DARM is best.
Trends of the ADF servo stabilizing the SQZ angle overnight. Looks good: the ADF SQZ ANGLE servo can hold the maximum squeezing level throughout the lock! Last night was running with the ADF SQZ angle servo + SQZ-IFO AS42 ASC together.
In the first lock of the screenshot, the ADF SQZ ANGLE servo is not yet running, and the squeezing level drifts quite a bit (~0.5-1 dB in ~2 hours, and ends up un-optimal). In the last 2 locks, the ADF SQZ ANGLE servo is running and successfully stabilizes the SQZ angle, though the 2 locks from last night stabilize at different SQZ angles (weird?). Note SQZ ASC is running in both of these locks, so it seems like ASC + ADF SQZ ANG servo work well when used together.
Naoki looked at sqz trends with/without the ADF servo before in LHO:75000. Looking at sqz trends for yesterday, the ADF servo stabilized the SQZ angle in the first ~25 minutes. Then over the first ~2 hours, the ADF servo needed to move the CLF_RF6 demod phase by 5-10 degrees to hold the SQZ angle stable. This implies something like, the optimal injected squeezing angle changed by about 2-5 degrees during IFO thermalization.
Also noting a reference to LHO:77292, where Naoki does an On/Off test with the ADF line at 322 Hz.
Checked against the 68139 list, can see that 322Hz is a good frequency for CW. We will look at trying to add this ADF line to the _CLEAN or _NOLINES subtractions.