WP 11914
ECR E2200401
Drawing D1301004

A PEM AA Chassis was installed in the H1-TCS-XC1 rack, slots U10/11. The AI Chassis D1101785 was moved to slots U13/14. An ADC card and adapter card were installed in the h1iscex IO chassis (third Adneco, first slot). The PEM AA chassis is part of the PEM upgrade ECR E2200401. Chassis will be used for testing of the LIGO DAC32 card.

PEM AA Chassis: Serial Number S2300112

D. Barker, F. Clara, M. Pirello E. Von Reis

Tue Jun 11 10:11:49 2024 INFO: Fill completed in 11min 45secs

Gerardo confirmed a good fill curbside.

There was a small typo on for a filter bank SUS-ITMX_L3_LOCK_L on line 55. By the time I noticed this and fixed it, it delayed it by ~7 min. The measurement completed and we lost lock about a minute afterward, but this seems more like a coincidence.

TITLE: 06/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 1mph Gusts, 0mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.14 μm/s
QUICK SUMMARY:Locked for 29.5 hours! Magnetic injections currently running. We have a 6 hours maintenance window today.

Workstations were updated and rebooted.  OS packages were updated.  Conda packages were not updated.

TITLE: 06/11 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
INCOMING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 1mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.13 μm/s
SHIFT SUMMARY:

H1 has been locked and observing all shift which is now 23 hours.
Everything seems to be running well.

Cosmic crew still staged in the MPR.

LOG:

FAMIS 26308 HVAC Vibrometer fans

The H0:VAC-MY_FAN1_270_1_ACC_INCHSEC saw a decrease in signal 3.5 days ago that also looks like it have more noise on the signal.

TITLE: 06/10 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: SEISMON_ALERT
    Wind: 13mph Gusts, 10mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY:

H1 Has been locked  for 14 hours and 20 minutes and is currently OBSERVING.
All systems seem to be functioning well.
 

TITLE: 06/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 127Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

For the morning H1 was in Observe (from Tony at 2am!) and shortly later we transitioned to Commissioning.  (much of this occurring under a glow of blue light from the visiting film crew!)  

The film crew completed multiple shots of Nergis, and filmed interviews with Sheila, Ibrahim, and Corey.  And we had lots of extras in the Control Room as well.  This work was mostly done after 1pm (they then moved to the Staging Building, LExC (early eve), and other shots?).
LOG:

• Film Crew has been in/out the site since atleast 730am; For the Control Room we had  studio lighting starting at 845amLOCAL and filming in the Control Room 
• 1455-1507 Addressing a fan near Filter Cavity End Station, no entry into main room (eric)
• 1458-1523 Optics Lab/Vacuum Prep technical cleaning (karen)
• 1520-1554 X1 Tube set-up for film crew & grabbing a fan (Tyler, eric)
• 1535-1855 Started to take (3) violin modes which weren't at their NOMINAL value (ETMy [Mode 1&4], ETMx [Mode 8], & ITMx [Mode 8 & 9]) back to their NOMINAL settings (corey)
• 1550 Out of Observing for COMMISSIONING
  • 1550 Squeezer Alignment (naoki)
  • 1557 & 1705 A2L meas (jenny)
  • .1630 Making a filter change (sheila)
  • 1833 Back to OBSERVING
• 1606-1735 MY cleaning (karen)
  • 1617-1700 MX cleaning (kim)
• 2035 PCal work for much of the afternoon--with a lunch break (francisco)
• 2109-2142 Drone test flights around OSB parking lot (richard)
• 2247 SHG green beam work in optics lab (terry)
• 2253 Incoming M5.1 earthquake from east Pacific Rise

J. Kissel

Here're the first results of looking at the channel's whose differential inputs I'd shorted to ground the other day (LHO:78302); the inputs to the AA chassis that feed ADC2 on the SEI H23 computer (and ADC2 is used to readout all of the HAM3 ISI's sensors and monitor signals.)

I'm happy to report that it's not that interesting:
    (1) We model all of these 16-bit, General Standards (16AI64SSA) ADC channels used in differential mode to asymptote to 3.6e-6 [V/rtHz], or ~4 [uV/rtHz] above 100 Hz, and to start getting worse than that below 10 Hz, eventually rising in noise inversely proportional to frequency ("rising with a 1/f slope below 10 Hz").
    (2) First attachment shows these four channels agree with, for the most part, with the asymptotes at 3.53e-6, 4.14e-6, 3.17e-6, and 3.24e-6 [V/rtHz] at 1000 Hz, so a range of 3.66e-6 +/- 13%, and the slope of noise increase at the low-frequency end agrees the xpected rise.
    (3) I'm a little bit sad that the 50-400 Hz region (see second attachment for zoom) which seems to have wide 5-20 Hz wide features that get as loud as 10 to 14 [uV/rtHz] at ~[55, 72, 95, 145, 165, 190, 220, 285, 370] Hz but I don't have time to investigate (e.g. the first thing I would do would be to check if these features have coherence with the other channels on this ADC that have real ISI sensor signals).

More to come on coupling to the DuoTone signals.

On Friday 06/07/2024 Dave Barker sent an email to the vacuum group noting 3 spikes on the pressure of the main vacuum envelope, I took a closer look at the 3 different events and noticed that the events correlated to the IFO losing lock.  I contacted Dave, and together we contacted the operator, Corey, who made others aware of our findings.

The pressure "spikes" were noted by different components integral to the vacuum envelope.  Gauges noted the sudden rise on pressure, and almost at the same time ion pumps reacted to the rise on pressure.  The outgassing was noted on all stations, very noticeable a the mid stations, and with less effect at both end stations, and for both with a delay.

The largest spike for all 3 events is noted at HAM6 gauge, we do not have a gauge at HAM5 or HAM4.  The one near HAM6 is the one on the relay tube that joins HAM5/7 (PT152), with the restriction of the relay tube, then the next gauge is at BSC2 (PT120), however the spike is not as "high" as the one noted on HAM6 gauge.

A list of aLOGs made by others related to the pressure anomalies and their findings:
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78308
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78320
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78323
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=78343

Note: the oscillation visible on the plot of the outer stations (Mids and Ends) is the diurnal cycle, nominal behavior.

Andrei, Sheila, Naoki

We've tried to link the observable whistles with working VCOs. We've manually checked the correlation between channel H1:SQZ-FC_LSC_DOF2_OUT_DQ and channels that record the frequency of squeezer related VCOs: H1:SQZ-CLF_VCXO_FREQUENCY, H1:SQZ-FC_VCO_FREQUENCY, and H1:SQZ-LASER_VCO_FREQUENCY.

Upon quick inspection Figure 1, we observed visible dependance of H1:SQZ-FC_LSC_DOF2_OUT_DQ channel excess noise with frequency noise of H1:SQZ-FC_VCO_FREQUENCY. However, the H1:SQZ-FC_VCO_FREQUENCY frequency deviates on far less scale than whistles of the channel H1:SQZ-FC_LSC_DOF2_OUT_DQ, therefore we believe it is safe to conclude that this frequency noise is the consequence of these whistels rather its cause.

Figure_2 shows the step-like frequency drift of the whistle-signal.

UPD: We've also disabled this VCO and checked whether its noise is the cause of our problems. However, since in the observation was only for a few hours, it was hard to say whether that solved the problem (see Figure 3). We will continue to make observation with turned off VCO.

UPD2: We've added channel H1:TCS-ITMX_CO2_ISS_CTRL2_OUT_DQ for analysis (Figure 1 and  Figure 3). It didn't show any dependance on whistles. 

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
 

LLO noted a 10 Hz comb that was attributed to the IRIG B monitor channel at the end station connected to the PEM chassis. (https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=71217)

LHO has agreed to remove this signal for a week to see how it impacts our DARM signal.

EX and EY cables have been disconnected.