bubba.gateley@LIGO.ORG - posted 15:14, Monday 21 March 2016 (26166)
Grouting in the LVEA and END STATIONS
The grouting is complete in the LVEA and both End Stations.
The grouting is complete in the LVEA and both End Stations.
Today we noticed that there were some unidentified bright dots on the ITMX green camera (cam22) which had not existed before. The positions of the dots were found to be functions of the alignment of the ITMX compensation plate for some reason. We temporarily applied a large offset (-530 urad in yaw) on the compensation plate to minimize the effect on the centroid fitting. We tried moving the dots by moving the large suspended optics, but none of them showed dependencies. We have no idea why we started having thees dots. We will try using the camera as it is since the dots seem to be insensitive to the arm cavity alignment.
The compensation plates seem to be responsible for the etalon effect. The green spots disappear, when the green beam is shuttered at the end.
Updated the camera configuration files (centroid and radius) and reference positions. Attached are snapshots and the config files.
PSL Status: SysStat: All Green, except VB program offline & LRA out of range Output power: 31.6w Frontend Watch: Green HPO Watch: Red PMC: Locked: 7 days, 0 hours, 55 minutes Reflected power: 3.0w Transmitted power: 22.0w Total Power: 25.0w ISS: Diffracted power: 7.48% Last saturation event: 0 days, 0 hours, 1 minutes FSS: Locked: 0 days, 0 hours, 1 minutes Trans PD: 1.498v
Added 125ml water to the crystal chiller. Added 100ml water to Diode chiller as preventive maintenance. Have closed FAMIS #4142.
Sheila & Jeff Transitioned the LVEA to laser hazard.
re aLog 26140
Here are snaps of 0-120hz spectra for HAMs 2 thru 6 with the reference traces from 13 March (before the switch last week,) and the current traces from this morning at 3am. Not even really suttle differences so I'd say at least no harm done from the switch to the common timing source.
Here are photos of the HAM CPS Satellite racks which have been mounted onto the BoxBeam Mount. This is why the HAM switch over was much longer than the BSCs. The single port Power Regulator board was swapped for a dual on the primary (CPS1) rack. All grounding was made more robust for both the primary green ground wire and the probe cable shield (woven copper jacket.) Mounting the racks on the Box Mount and rerouting cables such that the racks could be accessed but are more out of the way or could be moved when needed for safety, such as slinging heavy wrenches around when removing a door.
The photos are in order, HAM2 Rack1, Rack2, HAM3 Rack1....HAM6 Rack2.
@DetChar: Can you watch HAM3 for the next few days, and see if this has had any effect on 0.6 Hz?
Kiwamu, Patrick Kiwamu said that the TCS X power was changing for the same angle requested and readback by the rotation stage. We powercycled the rotation stage chassis in the CER and did a search for home for the TCSX, TCSY and PSL rotation stages that it controls. Kiwamu says it is now workable, but from what he showed me it still appears to be giving significantly different powers for the same angle.
Here is a screenshot showing the issue. I requested the same angle several times which moved the rotation stage to different angles and also power changed by roughly +/- 50 mW.
Attached are 7 day pitch, yaw, and sum trends for all active H1 optical levers.
Note that the SR3 oplev sum is ~0, even though it's pretty well aligned. No good.
That would be because the oplev is off. It had to be moved for the grouting last week and in the process was unplugged from its power supply. I haven't had a chance to plug it back in yet.
Due to the grouting, none of the oplevs (except the BS, no grouting was done to it) are good alignment references right now. Once the post-grouting optic alignment work is complete I will realign the optical levers.
The morning meeting days will change to 08:30 on Monday, Wednesday, and Friday. Monday's meeting will address review of weekend activities and work permits for Tuesday's maintenance. The Wednesday's will be a planning session. The Friday meeting will focus on FRS topics and weekend work. There is grouting still going on in the HAM2 area and at End-Y. Should be finished today. Vacuum is still pumping down in LVEA. Will be on Turbo pumps and annulus pumping for several days to weeks. Higher power operation of the PSL is planned for the week 04/04. Tuesday Maintenance: Reboot End-X vacuum computers for Beckhoff. POPX and WFS BRS at End-Y PI Boot
Attached are 45 day trends of the various PSL power monitors. The degradation of the power matches the decline of the front end laser pump diodes.
I'm curious as to why the trend lines are showing a "tailing up" of power in 3 of the 4 graphs? Was there another adjustment made to the diode currents?
Transition Summary: Title: 03/21/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT) State of H1: IFO unlocked. Planned Engineering Commissioning: Outgoing Operator: N/A Environmental conditions are favorable for relocking. Will see what the plans for the day are at the 08:30 meeting.
After realigning the IFO, I lost lock a couple of times during ASC_PART1, due to PRC2_Y engaging.
Going slow the next time, it first looked like the IFO was more happy with the PRC2_Y input matrix of RF9I=0, RF45I=-1 .
But after about 15min the the input matrix from the guardian script - RF9I=0.7, RF45I=-1 , seemed to work just fine.
In the attached plot, notice that the RMS in all signals shrank significantly over about 15min.
So far so good.
Hang, Stefan
We went through the whole initial alignment today. The hickups along the way were:
- Because the green cameras are off-line, we turned off the ITM green camera centering loops: all four H1:ALS-[X|Y]_CAM_ITM_[PIT|YAW]_ERR OUTPUT OFF
- This meant that the best reference on the ITM was the baffle-pointing from the TMS - we found arm alignments that correspond to those TMS pointing positions.
- Input alingment and PRM alignment were simple.
- Next we had trouble locking both MICH_DARK and the SRY cavity - we tracked it down to large electronic offsets on the AS 45 diode. We set the dark offsets on all LSC and ASC RF photodiodes.
- Then ALS DIFF wouldn't lock. Also took a while to track it down to an ESD that was switched off.
- Next we tried to lock DRMI, but ALS got kicked during locking transients. We first suspected the BS OPLEVs, but they were fine. Turns out the SRCL FF was left on - so SCRL kicked the ITMs. We updated the down script to turn FF off.
- After all that the alignment had drifted enought than we needed to realign the corner, which then was enough to lock DRMI.
- Next DRMI always lost lock on ASC engaging. Turns out the input matrix element for MICH_P was not properly set up (two lines of code were commented out)
- With that we reached DRMI_LOCKED, and continued all the way to DARM_OFFSET.
- Finally ENGAGE_ASC_PART1 failed, due to a run away PR3 YAW loop.
That's there we left it for the day.
1/2 open LLCV bypass valve, and the exhaust bypass valve fully open.
Flow was noted after 1 minute and 10 seconds, closed LLCV valve, and 3 minutes later the exhaust bypass valve was closed.
Next over-fill on Monday, March 21st before 23:00 utc.
Activity Log: All Times in UTC (PT) 22:30 (15:30) Take over from Ed 22:51 (15:51) ITMX & ETMX ISI and SUS TMSX WDs tripped due to a mag 5.2 EQ near Vancouver Island, CA. 23:44 (16:44) Started working on initial alignment. 01:50 (18:50) Several ITMX ISI WD trips due to 6.2 EQ off Atka Alaska. 02:10 (19:10) Commissioners have left for the night. End of Shift Summary: Title: 03/18/2016, Evening Shift 23:00 – 07:00 (16:00 – 00:00) All times in UTC (PT) Support: N/A Incoming Operator: N/A Shift Detail Summary: Working with Stefan & Hang to relock the IFO. Had the TMS(s) realigned and the X-Arm green. While working on Y-Arm green, took a mag 6.2 EQ off Atka Alaska, which rang everything back up, tripping the ITMY ISI WD several times. Decided to call it a night and try again tomorrow.
Hang, Jeff, Stefan
After all the grouting we had to do a rough manual arm alignment to see the transmitted beam.
After that we ran the baffle alignment script:
/opt/rtcds/userapps/release/asc/h1/scripts/ditherAlign.py
We also had to adjust H1:AOS-xxxx_BAFFLEPD_x_NOMINAL for thje script to catch the baffles (for some reason they were changed after O1).
That all went fine until the next double earthquake hit - Atka, Ak, Magtnitude 5.0 & 6.2. The attached alignment should at bleast let the green arms flash.
