at 00:29 Fri 30 Aug 2024 PDT there was a short vacuum glitch in HAM6 detected by PT110_MOD1.

The pressure increased from 1.90e-07 to 2.06e-07 Torr.

Yesterday in the instrument air trend there was a brief period of pressure loss which was caused by the air dryer being turned off for several minutes while a line voltage switch was added to the unit. The bypass on the dryer was not opened, so additional air was not fed into the system. Once power was restored the dryer functioned correctly and allowed air back in. 

Fri Aug 30 08:11:24 2024 INFO: Fill completed in 11min 20secs

TITLE: 08/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 7mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s
QUICK SUMMARY:

IFO was locked and Observing for 8 Hours before I walked in to the Control room.
Looks like the IFO locked it's self last night with out calling Oli after losing lock at LASER_NOISE_Suppression.

H1's Current Status is LOCK at NOMINAL_LOW_NOISE and OBSERVING for 8 Hours and 27 Min.

H1EDC is reporting a NUC33 error :

       Total Channels : 56980
   Connected Channels : 56968
Disconnected Channels :    12

H1:CDS-MONITOR_NUC33_CPU_LOAD_PERCENT
H1:CDS-MONITOR_NUC33_CPU_COUNT
H1:CDS-MONITOR_NUC33_MEMORY_AVAIL_PERCENT
H1:CDS-MONITOR_NUC33_MEMORY_AVAIL_MB
H1:CDS-MONITOR_NUC33_PROCESSES
H1:CDS-MONITOR_NUC33_INET_CONNECTIONS
H1:CDS-MONITOR_NUC33_NET_TX_TOTAL_MBIT
H1:CDS-MONITOR_NUC33_NET_RX_TOTAL_MBIT
H1:CDS-MONITOR_NUC33_NET_TX_LO_MBIT
H1:CDS-MONITOR_NUC33_NET_RX_LO_MBIT
H1:CDS-MONITOR_NUC33_NET_RX_ENO1_MBIT
H1:CDS-MONITOR_NUC33_NET_TX_ENO1_MBIT

TITLE: 08/29 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 141Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

H1 had a late-shift lockloss, and was pretty much automated (need INCREASE FLASHES & PRMI), but near the end there was a lockloss at LASER NOISE SUPPRESSION...most likely due to an EQ from Russia.  H1's already giving it a go.
LOG:

• 2322-2327 Out of OBSERVING
  • 2322 SEI PROC change test to see if it takes us out of Observe--it did (Jim).
  • 2323-2327 Elenna working on PRCL FF
    • saw these channels ring up on nuc29: CHARD_P, CSOFT_P, CSOFT_Y.  Told Elenna so she could turn off her excitation.  This also caused a glitch on DARM (nothing on verbal)
  • 2327Back to Observing
• 2258-2331Back from MY for measurements (janos)
• 2343-2357 Ion Pump power supply on/off test; said should not affect vacuum or H1 (janos, robert)
• 0040-0107 MY & MX measurements (janos)
• 0347 LOCKLOSS (10hr10min lock)
  • 0443 lockloss at LASER NOISE SUPPRESSION
  • It almost made it to NLN!  But.......  After a few minutes it looks like it's related to a M6.0 EQ fairly close from Russia.  Saw earthquake signals on picket fence starting up around 0340.
  • R-waves just passing through toward end of the shift and see on the picket fence....so it's now making it tough for Green Arms locking (post-INCREASE FLASHES).

Here is an investigation that might give us insight into the PRCL/CHARD/DARM coherences.

Today, we ran a PRCL injection for the feedforward where we injected directly into the PRCL loop. I took this injection time and looked at how the CHARD P and Y error signals changed, as well as their respective coherences to PRCL and DARM (figure). When injecting about 15x above ambient in PRCL from 10-100 Hz, there is a 2x increase in the CHARD P error signal and 4x increase in the CHARD Y error signal. The coherences of CHARD P and Y to PRCL increase as well, and the coherences of CHARD P and Y to DARM also increase. This injection allows us to measure a well-defined CHARD/PRCL transfer function. In the attached screenshot of this measurement, all the reference traces are from the injection time, and all the live traces are during a quiet time.

Meanwhile, I looked back at the last time we injected into CHARD P and Y for the noise budget, on June 20. In both cases, injecting close to 100x above ambient in CHARD P and Y did not change either the CHARD/PRCL coherence or PRCL/DARM coherence. There is some change in the PRCL error signal, but it is small. Again, in the attachments, reference traces are injection time and live traces are quiet time. CHARD P figure and CHARD Y figure.

I think that this is enough to say that the PRCL/DARM coupling is likely mostly through CHARD P and Y. This would also make sense with the failure of the PRCL feedforward today (79806). However, we may want to repeat the CHARD injections since there have been many IFO changes since June 20.

TITLE: 08/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 142Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 19:03 UTC (with some small drop-outs to reload ISC lock and test some filters)

We only had one lockloss today and it was during our 9-12 PST comissioning. Lock acquisition was fully automatic.

Other than this, comissioning went well. Some highlights:

• Thermalized Calibration Sweep - alog 79786
• New HAM1 FF for CHARD P and INP1 P - Improvement - alog 79799
• Jitter Cleaning Coefficients Update - alog 79797
• A2L Scripts for all QUADs - alog 79796

LOG:

TITLE: 08/29 Eve Shift: 2300-0500 UTC (1600-2200 PST), all times posted in UTC
STATE of H1: Observing at 141Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 5mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY:

H1 has been locked 5.5+hrs, with range hovering under 150Mpc.  Environmentally we are really quiet.

There has been mention of taking H1 down briefly for a PRCL FF test/change (ElennaC).

Here is a comparison of DRMI and CHARD control signal spectra from July 11th to this afternoon, after Elenna's new HAM1FF. 

The control room FOM seems to indicate that there is some huge excess noise in our DRMI signals, but this comparison shows that isn't the case.  Also, the CHARD control signals are largely similar, with an improvement in pitch which is likely from the HAM1 FF tuning.

Robert, Sheila

Robert and I went to ISCT1 before the beam diverters closed in this morning's lock acquisition.  We saw that there was a beam from a POP path beam splitter that was dumped on a razor blade dump that was hitting the top of the dump, so that a small part of the beam was visible on the ALSX camera.  We adjusted the beam dump to fully catch the beam.  Once the beam divereters are closed this beam isn't there, so this shouldn't have been a noise issue in nominal low noise. 

Robert has seen coherence between an accelerometer on this table and DARM in observing, we tried closing the ALS light pipe and Robert saw that didn't change the coherence, so he opened the light pipe again.

We did a 10 minute on/off HAM1 FF test today. I determined from that test that improvement could be made to the feedforward to CHARD P and INP1 P, so I used that off time to train new filters (time here: 79792).

I took a screenshot of the DTT results. The golden traces represent the various loop spectra with the feedforward OFF. Blue represents the previous feedforward, and red represents the new feedforward I fit today. First, look at the top and bottom plots on the left, showing CHARD P and INP1 P. You can see that the old feedforward was having minimal benefit (gold to blue), and the new feedforward is performing much better (gold to red).

Next, look at the middle plot on the left showing CHARD Y. This plot shows that the feedforward is making CHARD Y WORSE (blue worse than gold). Therefore, I just turned it off. I am not yet happy with the fitting results for CHARD Y, so I will continue to work on them.

You can also see in the middle right plot, PRC2 P current feedforward is performing well (gold to blue), so I made no change, red still matches blue.

Note! This means the significant change here must be related to RF45- PRC2 is only sensed on RF9, while INP1 and CHARD use RF45.

Finally, DARM on the right hand side shows improvement from blue to red. It looks like HAM1 FF off is better below 15 Hz, maybe due to CHARD Y.

The new CHARD P and INP1 P filters are all saved in FM9 of their respective banks. I SDFed the new filters, and the CHARD Y gains to zero, second screenshot.

I made one mistake which is that I did not SDF these changes in SAFE, only in OBSERVE, which means that needs to be done before an SDF revert, since they are not guardian controlled!

Naoki, Sheila

We changed SRCL offset to see if it can improve the bucket sensitivity. Every time we changed the SRCL offset, we ran SCAN_SQZANG. We modified the SCAN_SQZANG to optimize the BLRMS6 at 2 kHz instead of BLRMS3 at 350 Hz. We reverted it after the measurement.

The attachment shows the DARM with different SRCL offset. The nominal SRCL offset is -175. The SRCL offset of -100 is worse than nominal in the bucket, but others are similar. So we left the SRCL offset at nominal value. Compared to O4b start, squeezing is good above 1kHz, but worse below 1kHz.

I ran the a2l_min_multi.py script, again not with a thermalized IFO though (Monday same story alog79714). This time there were some changes to ISC_library.py that made it so I was running into an import error with cdslib. I temporarily removed the dependence on cdslib by commenting it out, and I'll figure out how to get around this later. I did all quads and both dofs at the same time, ETMX P having the largest change of -0.14 but the rest were similar. I ended up unmonitoring all of these gains since they are saved in guardianl I updated lscparams.py with these new values, but I have no loaded ISC_LOCK yet.

RESULTS
*************************************************
         ETMX P
Initial:  3.13
Final:    2.99
Diff:     -0.14

         ETMX Y
Initial:  4.87
Final:    4.9
Diff:     0.03

         ETMY P
Initial:  4.48
Final:    4.48
Diff:     0.0

         ETMY Y
Initial:  1.13
Final:    1.13
Diff:     0.0

         ITMX P
Initial:  -0.98
Final:    -1.0
Diff:     -0.02

         ITMX Y
Initial:  2.87
Final:    2.87
Diff:     0.0

         ITMY P
Initial:  -0.37
Final:    -0.39
Diff:     -0.02

         ITMY Y
Initial:  -2.48
Final:    -2.45
Diff:     0.03
 

I was able to new SRCL and MICH feedforward using the iterative method. Measurements were taken in alog 79693.

The current MICH FF is performing well except for below 30 Hz, so that's where I targeted in my fit. SRCL needed some improvement everywhere.

The new MICH filter is saved and loaded in FM8 and the new SRCL filter is saved and loaded in FM5. They are both labeled with the date '8-27-24'.

To compare how these filters are performing, I would use the templates Oli saved in the above alog, but first save the live trace as a reference to compare against.

I have not yet done the PRCL fit because I want to see how SRCL performs, and maybe redo the PRCL injections before trying the fit.

I ran A2L while we were still thermalizing, might run again later. No change for ETMY but the ITMs had large changes. I've accepted these in SDF, I reverted the tramps that the picture shows I accepted. I didn't notice much of a change in DARM or on the DARM blrms.

         ETMX P
Initial:  3.12
Final:    3.13
Diff:     0.01

         ETMX Y
Initial:  4.79
Final:    4.87
Diff:     0.08

         ETMY P
Initial:  4.48
Final:    4.48
Diff:     0.0

         ETMY Y
Initial:  1.13
Final:    1.13
Diff:     0.0

         ITMX P
Initial:  -1.07
Final:    -0.98
Diff:     0.09

         ITMX Y
Initial:  2.72
Final:    2.87
Diff:     0.15

         ITMY P
Initial:  -0.47
Final:    -0.37
Diff:     0.1

         ITMY Y
Initial:  -2.3
Final:    -2.48
Diff:     -0.18