Jennie W, TJ
See attached images for the SDFs I reverted which were just used for our A2L measurements (mostly TRAMPS or filter settings in ADS YAW7 and PIT7 banks which were used for injecting our A2L tuning lines but are not used normally).
The only ones I accepted were the updated DRIVEALIGN gains used to minimise the A2L coupling.
After the commissioning period this morning where I tuned A2L gains, Naoki tuned the squeezer, and Sheila updated the MICH FF we gained noticeably at frequencies above 60 Hz and between 18 Hz to 23 Hz.
We are noticeably worse below 12 Hz.
See attached plot.
The template is stored in /jennifer.wright/Documents/ASC/20240610_DARM_pre_post_A2L_tuning.xml
Closes FAMIS 25995, everything looks good at high frequency.
ITMY_ST2_CPSINF_H1 looks elevated below 10 Hz
ETMY_{ST1,ST2}s overall noise looks reduced below 10 Hz
Jennie W, Sheila
Sheila wanted me to look at how good our optical gain is doing since the burn on the OFI that roughly happened (we think) on the 22nd April.
Before this happened we made a measurement of the OMC alignment using dithers on the OMC ASC degrees of freedom. We got a set of new alignment offsets for the OMC QPDs that would have increased our optical gain but did not implement these at the time.
After the OFI burn we remeasured these alignment dithers and found a similar set of offsets that would imrpove our optical gain. Thus I have assumed that we would have achieved this optical gain increase before the OFI burn if we had implemented the offset changes then.
Below is the sequence of events then a table stating our actual or inferred optical gain and the date on which it was measured.
Optical gain before vent as tracked by kappa C: 2024/01/10 22:36:26 UTC is 1.0117 +/- 0.0039
Optical gain after vent: 2024/04/14 03:54:38 UTC is 1.0158 +/- 0.0028, optical gain if we had improved OMC alignment = 1.0158 + 0.0189 = 1.0347
SR3 yaw position and SR2 yaw and pitch positions were changed on the 24th April ( starting 17:18:15 UTC time) to gain some of our throughput back.
The OMC QPD offsets were changed on 1st May (18:26:26 UTC time) to improve our optical gain - this improved kappa c by 0.0189.
Optical gain after spot on OFI moved due to OFI damage: 2024-05-23 06:35:25 UTC 1.0051 +/- 0.0035
SR3 pitch and yaw positions and the SR2 pitch and yaw positions were changed on 28th May (starting at 19:14:34 UTC time).
SR3 and SR2 positions moved back to pre-28th values on 30th May (20:51:03 UTC time).
So we still should be able to gain around 0.0296 ~ 3% optical gain increase, provided we stay at the spot on the OFI we had post 24th April:
SR2 Yaw slider = 2068 uradians
SR2 Pitch slider = -3 uradians
SR3 Yaw slider = 120 uradians
SR3 Pitch slider = 438 uradians
Date | kappa_C | Optical Gain [mA/pm] | Comments |
---|---|---|---|
10th January | 1.0117 | 8.46 | O4a |
14th April | 1.0347 | 8.66 | Post vent |
23rd May | 1.0051 | 8.41 | Post OFI 'burn' |
I'm not really sure why, but our optical gain is particularly good right now. And, it's still increasing even though we've been locked for 12+ hours.
The other times in this plot where the optical gain is this high is about April 5th (well before the OFI incident), and May 30th.
Actually, this *might* be related to the AS72 offsets we've got in the guardian now. Next time we're commissioning, we should re-measure the SR2 and SRM spot positions.
Jennie W, Sheila, Louis
I recalculated the optical gain for pre-vent as I had mixed up the time in PDT with the UTC time for this measurement, it was actually from on the 11th January 2024.
Also the value I was using for OMC-DCPD_SUM_OUT/LSC-DARM_IN1 in mA/counts changes over time, and the optical gain reference value in counts/m also changes between before the vent, April, and now.
Louis wrote a script that grabs the correct front-end calibration (when this is updated the kappa C reference is updated) and the measured OMC-DCPD_SUM_OUTPUT to the DARM loop error point.
Instructions for running the code can be found here.
The code calculates current optical gain = kappa C * reference optical gain * 1e-12 / (DARM_IN1 divided by OMC-DCPD_SUM)
[mA/pm] = [counts/m] * [m/pm] / [counts/mA]
All the kappa Cs in the table below and all the optical gains were calculated by Louis's script except for the 14th April.
I calculated the optical gain on the 14th April assuming as in the entry above that we would have got a (~0.0189) increase in kappa C if we had previously (before the 14th April) implemented the OMC alignment offsets we in fact implemented post OFI burn, on 1st May.
I went to these reference times and measured coupled cavity pole, f_cc and P_circ the arm cavity power.
I also checked the OMC Offset and OMC-DCPD_SUM for these times (which shouldn't change).
Date | kappa_C | f_c | Optical Gain [mA/pm] | P_Circ X/Y | OMC Offset | OMC-DCPD_SUM | Comments |
---|---|---|---|---|---|---|---|
06:36:26 UTC |
1.0122 | 441 +/- 7 | 8.33 | 368 kW +/- 0.6kW | 10.9405 +/- 0.0002 | 40mA -/+ 0.005 | O4a, time actually 11/01/2024 06:36:26 UTC |
03:54:54 UTC |
1.0257 | 391 +/- 7 | 8.70 | 375 +/- 0.8 kW | 10.9402 +/ - 0.0002 | 40mA -/+ 0.003mA | Post vent |
06:35:41 UTC |
1.0044 | 440 +/- 6 | 8.52 | 382 kW +/-0.4 kW/ 384 kW +/- 0.4 kW | 10.9378 +/- 0.00002 | 40mA +/- 0.006 mA | Post OFI 'burn' |
09:43:04 UTC |
1.0171 | 436 +/- 7 kW | 8.62 | 379 kW +/- 0.6 kW/ 380 kW +/- 0.5 kW | 10.9378 +/- 0.00002 | 40mA +/- 0.004 mA | Post HAM6 pressure spike |
In summary we have (8.62/8.70) *100 = 99.1% of the optical gain that we could have achieved before the OFI burn, and our current optical gain is (8.62/8.33)*100 = 103.5 % of that before the vent.
We do not appear to be doing worse in optical gain since the vacuum spikes last week.
Mon Jun 10 10:11:12 2024 INFO: Fill completed in 11min 7secs
Travis confirmed a good fill curbside
Naoki, Sheila
To investigate the origin of whistles and rms increase in FC IR signal as reported in 78263 and 78344, we turned off the FC green VCO lock after FC IR transition.
In TRANSITION_IR_LOCKING state of SQZ_FC guardian, the FC CMB servo is disabled after FC IR transition. Since we use the green QPD at FC trans for beam spot control, we also turned off the beam spot control. The SDF is accepted as shown in the attachment.
After this guardian change, FC lost lock after IR transition. I reverted the guardian change and FC lock is fine. The FC CMB input is ON now and it was OFF from 2024/06/10 16:44:06 UTC to 2024/06/11 15:07:58 UTC. The beam spot control is still OFF.
After getting the OK for operations ABOVE 10W for H1 yesterday, I forgot to post anything looking at pressure sensors during higher power locklosses/operations yesterday/today. So here is a look from the last 24hrs.
Jennie W, Sheila, TJ
This is done to reduce the coupling we get to length from having off-centre spot positions on the mirrors.
The script can be found in userapps/isc/common/scripts/decoup/a2l_min_generic_LHO.py .
See the steps the script runs in the bottom two plots and the reponse of the ADS demodulated signals in the top plots.
I ran ETMX P and Y first by calling the script with
python a2l_min_generic_LHO ETMX BOTH
changed P and Y
H1:SUS-ETMX_L2_DRIVEALIGN_P2L_SPOT_GAIN => 3.22
H1:SUS-ETMX_L2_DRIVEALIGN_Y2L_SPOT_GAIN => 4.99
ETMY
both P and Y changed
H1:SUS-ETMY_L2_DRIVEALIGN_P2L_SPOT_GAIN => 4.3
H1:SUS-ETMY_L2_DRIVEALIGN_Y2L_SPOT_GAIN => 0.92
ITMX
both P and Y changed
H1:SUS-ITMX_L2_DRIVEALIGN_P2L_SPOT_GAIN => -0.99
H1:SUS-ITMX_L2_DRIVEALIGN_Y2L_SPOT_GAIN => 2.88
ITMY
H1:SUS-ITMY_L2_DRIVEALIGN_P2L_SPOT_GAIN => -0.36
H1:SUS-ITMY_L2_DRIVEALIGN_Y2L_SPOT_GAIN => -2.5
16:35:52 UTC all A2L gains set and script finished.
CHARD_Y coupling was still bad so we reran Y degree of freedom for all test masses.
ETMX
Want to change gain from 4.99 to 4.98, rounded to 2 decimal places. St.Div is 0.925. Change of 0.01
H1:SUS-ETMX_L2_DRIVEALIGN_Y2L_SPOT_GAIN => 4.98
ETMY
Want to change gain from 0.92 to 0.93, rounded to 2 decimal places. St.Div is 0.145. Change of -0.007
H1:SUS-ETMY_L2_DRIVEALIGN_Y2L_SPOT_GAIN => 0.93
ITMY
Want to change gain from -2.5 to -2.5, rounded to 2 decimal places. St.Div is 1.0. Change of -0.001
Gain did not change.
3 A2Ls changed by 17:33:32 UTC.
ITMX
Want to change gain from 2.88 to 2.87, rounded to 2 decimal places. St.Div is 0.496. Change of 0.01
H1:SUS-ITMX_L2_DRIVEALIGN_Y2L_SPOT_GAIN => 2.87
3 A2Ls changed by 17:33:32 UTC.
I don't think these values made it into lscparams' dictionary a2l_gains['FINAL'] (starting around line 451 in lscparams.py), so they were reverted for the next lock, and they were accepted as the previous values in alog 78383.
FAMIS 20701
No major events for this week, but I am noticing that the PMC TRANS/REFL drifting we've been seeing for a couple months now has somewhat settled down. Thinking this might relate to how we've had an unlocked IFO for longer periods of time in recent days, I trended this against IFO range, but I don't notice a strong correlation.
GV20 AIP went red yesterday, about 22:43 utc time. We will take a look at the controller for this unit as soon as posible, failure is unusual, as of right now it appears as if the controller failed, per trend of adjecent gauges the internal pressure does not appear to be affected. No further action is required at this moment.
TITLE: 06/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 128Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 8mph Gusts, 5mph 5min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.14 μm/s
QUICK SUMMARY:
H1's OBSERVING! (after no Observing for several days)
H1 has been locked at high sensitivity for 5.5hrs and observing just under that time. Nuc30's DARM spectra is froze, so I'm trying to open it up again, or see if the nuc needs a reboot. From what I can see, the violins are slowly ringing down from being rung up from the recovery time of the last few days.
Environmentally, all looks good with low winds, and microseism droping. The higher frequency (3-30Hz) seismic seen around the corner station yesterday afternoon/eve was probably from the trucks & Genie for the film crew.
The Control Room is in a filming configuration as lighting and flim equipment is staged.
TITLE: 06/10 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 130Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:
ASC DIFFS
LSC-MISCH2
and
SUS-ITMY_R0_OPTICALALIGN TRAMPS & OFFSETS
Please see Screenshot!
Also had to Init LOCKLOSS_SHUTTER GUARDIAN.... before OBSERVING.
Current H1 STATUS is NLN for 16 minutes and OBSERVING.
Oh wow. What a shift! Great job, Tony! And all the remote help from Sheila, Keita, & Jenne!!
TITLE: 06/10 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 15mph Gusts, 11mph 5min avg
Primary useism: 0.05 μm/s
Secondary useism: 0.16 μm/s
QUICK SUMMARY:
Reverted to 1402011129 which is just after initial alignment.
lost lock again a number of times trying to get back to LOWNOISE_LENGTH_CONTROL
Started at line 5008 entering lines of code into guardian -i ISC_LOCK shell terminal
Lost lock @ Transition_From_ETMX after entering line 5092 from ISC_LOCK
ezca.get_LIGOFilter('SUS-ETMX_L3_LOCK_L').ramp_gain(0, ramp_time=5, wait=False) #
Many attempts to lock DRMI later and a few Alignment touchups, we arrived at CARM to Analog where there were a number of saturatrions.
I have since reached higher lock states where I waited in LOWNOISE_COIL_DRIVERS, TRANSITION_FROM_ETMX, and LOWNOISE_LENGTH_CONTROL for a few minutes EACH after they finished.
Nuc30, the main DARM Screen is acting a fowl and is not runnign correctly agian. I tried rebooting but it refused to load the XFCE4 panel & windows manager correctly.
I have made it to OMC_WHITENING but I'm greated with the following ISC_LOCK messages:
The Violins are going down the Main culprits are EYM1, EXM8, and as per usual IYM5&6 !O.o!
2024-06-10_08:00:40.526574Z ISC_LOCK [OMC_WHITENING.run] USERMSG 0: EEEEEPP! ADC Counts for the DCPDs are too high. With whitening they would be 536240, larger than the 524288 available counts! Cannot turn on OMC whitening! Stay here and damp violins
After we make it to NLN there will be a large number of SDF changes to accept.
TITLE: 06/09 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 14mph Gusts, 10mph 5min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.20 μm/s
QUICK SUMMARY:
Initial_Alignment was run, Locking process started and set to stop at LOWNOISE_FROM_ETMX so the next state can be troubleshot.
TITLE: 06/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Tony
SHIFT SUMMARY:
Tried to be better at noting main items in the alog today, but overall, we have received the OK for high power work from Jenne/Mike. With this, spent most of the day with Keita remotely, Sheila via chat, and then Jenne joined remotely. Have made it past 60W a few times, but have an issue at LOWNOISE LENGTH CONTROL. The last hour or so H1 has had locklosses in early steps around DRMI and earlier, so Tony started an alignment.
The COSMIC film crew has been busy with set-up in the MPR, Roof, and Control Room. (Richard and Mike have been working with them.)
LOG:
Corey, (Jenne, Keita
For last few days, to lock the OMC, one needed to manual adjust SRM pointing to minimize POP90 before Locking the OMC---this was done from the ENGAGE SOFT LOOPS state (steps noted by Sheila and in alog 78331).
To make this step easier in the future, went through the same process, but at the end, we wanted the ASC to take care of this in the future. So,
And we are currently attempting the MAX POWER step on ISC LOCK.....but there is also some ground motion going on by the film crew's trucks and Richard is also going to be using the Genie Lift to help them put some equipment on the roof.
I just put these vals into the guardian (using the usual offset, not the smooth offset) in ISC_LOCK near the end of EngageASCforFullIFO. Tramp and values set around line 3496-3500, offset turned on in 3525-3527. We're going to try them this lock.