Follow up to the previous SRM M1 boost test, I tested the new boost yesterday, druing commissioning with the IFO in NLN. Seems like it works pretty good, I have added it to the ISC_DRMI guardian. Attached asds were taken yesterday, the refs are with the boost on, the live traces are with the boost off. Top plot are SRCL and SRM M3 drives, they are both reduced up to almost 10x around 50mhz, with very little gain peaking around .25 hz. I think the extra high frequency SRCL noise is from a measurement RobertS was doing. Bottom plot are the OAF SRCL length using the ISI gs13 suspoint motions, showing the table motions were very similar between the two measurements.  Hopefully this will help with staying locked during earthquakes and other low frequency motion.

Tue Jul 02 10:09:09 2024 INFO: Fill completed in 9min 6secs

Gerardo confirmed a good fill curbside.

WP 11948

Symmetra batteries on the MSR UPS unit were replaced. All batteries installed are now the V66 version. The 16 batteries on bank 1 were replaced today. Bank 2 batteries were replaced on 2022. Verified unit showed all 32 batteries installed across both banks. Dave confirmed emails were being sent out from unit.

D. Barker, F. Clara. M. Pirello, R. McCarthy

WP 11942
alog 78641

The spare Laser Locking Beat Note Chassis installed on SQTZ0 was removed. Unit was swapped last week but left on the table, alog 78641. Part of ongoing search for glitches seen by SQZ.

Chassis S2300259 stored in EE lab as spare.

F. Clara, M. Pirello

Looked at the wind fences this morning. No new damage. EY has a yoke (from an old repair) that broke a couple months back on the one panel we didn't replace, first attached image. This hasn't gotten any worse. EX still looks okay, second image.

Last week I did a major rewite of the CDS HW reporting EPICS IOC to catch any future DAC FIFO errors which are currently not being shown in the models' STATE_WORD. Part of that rewrite was to obtain all the front end data from the running DAQ configuration hash.

Today I released a new version which:

• Shows the DAQ hash (truncated to last 8 chars) and time it was read
• Checks hourly if the running hash has changed, and if so, rereads the front end data
• Added an EX Timing check to verify the "X" timing error continues to be just the new firmware running on h1susex's timing card

cds_status_ioc.py

WP11955

We installed 8 additional channels to the LD32 DAC for testing in SUS-EX.  While there we cleaned up cable routing for this test, also we swaped the 8x BNC to DB25 adapter to troubleshoot the disconnect on channel 5.

The initial install is located here ALOG78642

M. Pirello, F. Clara

TITLE: 07/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 6mph Gusts, 4mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.06 μm/s
QUICK SUMMARY:
As I was arriving the IFO was just getting back into Nominial_Low_Noise at 14:26 UTC>
Took Observatory mode to Calibration to the Inlock charge measurements.

Everything seems to be currently functioning just fine.


 

Workstations were updated and rebooted.  These were OS package updates.  Conda packages were not updated.

TITLE: 07/02 Eve Shift: 2300-0500 UTC (1600-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Oli
SHIFT SUMMARY: High winds this evening have kept H1 down for the past 4 hours; gusts peaked around 45mph. Since they've calmed down a bit, I've started locking H1 and it's just reached ENGAGE_ASC_FOR_FULL_IFO.

• 00:59 - Lockloss (78790)
  • Holding H1 in DOWN to wait for winds to calm
• 03:44 - Trying to lock since winds have calmed slightly

LOG:

These are the times for the continuation of the project discussed in 78734. Unfortunately, we again lost lock before I finished.

Lockloss @ 00:59 UTC - link to lockloss tool

Ends lock at 4h45m. I suspect the cause was wind; gusts have recently hit up to 45mph and there have been lots of glitches in the past hour or two.

A continuation on the previous measurements where we seen a drop in green power at 34 Celcius in both SHG 1 and 2 in a cavity setup.

To exclude the effect of optical cavity, we took off the front mirror of the cavity and took the double pass measurements under slightly different beam alignment. Then the single pass measurement is done by removing the rear mirror. The single pass measurement result fits the model, but not the double pass (not sure why).

Rebuild SHG 2, and measure the phase matching condition with lower pump at 10mW (in comparison all previous measurement were done with 60mW), and the same drop in power is seen in 34 Celcius.

Conclusion: the sinc curve phase matching measurement is only reliable when done in single pass setup. The measurement done in cavity setup is not definitive in diagnosing crystal condition.

FAMIS 20704

The NPRO has had a couple of sudden power jumps in the past week, seen also by output of AMP1 and less so from AMP2. The AMP LD powers didn't move at the same time as these jumps.

PMC transmitted power continues to fall while reflected power increases; when we swap the PMC tomorrow morning this should finally be put to rest.

Jason's brief incursion last Tuesday shows up clearly in environment trends.

TITLE: 07/01 Eve Shift: 2300-0500 UTC (1600-2200 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: SEISMON_ALERT
    Wind: 16mph Gusts, 11mph 5min avg
    Primary useism: 0.07 μm/s
    Secondary useism: 0.07 μm/s
QUICK SUMMARY: H1 has been locked and observing for just over 3 hours. ITM bias change tests while observing have resumed for the afternoon.

• Wind is slightly elevated, microseism is low
• All other systems nominal

TITLE: 07/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 20:17 UTC (3 hr xx min lock)

Very calm rest-of-shift after a speedy <1 hr 30 min lock acquisition.

Other:

1. Accepted SDF Diff is screenshotted (SUS SRM)
2. ITMY L3 Bias is UNMONITORED until Robert is done working on it (to not affect observing). Also screenshotted
3. Expecting 5.3 EQ from Japan

LOG:

FAMIS 21042

pH of PSL chiller water was measured to be just above 10.0 according to the color of the test strip.

Naoki, Camilla

We continued the ZM4 PSAMS scan with hot OM2 in 78636. We changed ZM4 PSAMS strain voltage from 7.5V to 5.5V and saw the squeezing and range improvement as shown in the first attachment. The second attachment shows the squeezing imrovement. The squeezing level is 5.2dB around 2 kHz.

We also tried 4.5V ZM4 PSAMS, but it is worse than 5.5V. So we set the ZM4 PSAMS at 5.5V. The ZM5 PSAMS strain voltage is -0.78V.

Everytime we changed ZM4 PSAMS, we compensated the ZM4 pitch alignment with slider and ran SCAN_ALIGNMENT_FDS and SCAN_SQZANG.

A few weeks back Oli put in an alog about IMC and SRM M3 saturations during earthquake lock losses. In April of 2023 Gabriele had redesigned the M1-M3 offload, reducing the gain of the offload somewhat to get rid of 3-ish hz instabilities in the corner cavities. This may have contributed to the SRM saturations that Oli found, so we want to try adding some low frequency gain back into the SRM offloading.

Sheila wrote out the math for me for the stability of both the SRCL loop and the stability of the M1-M3 crossover, so I have been looking at ways to increase the low frequency gain without affecting the stability above 1hz. The open look gain for SRCL looks like :

SRCL_OLG =  SRCL_sens * SRCL_FIlter * (SRM_M3_PLANT+SRM_M1_LOCK_FILTER * SRM_M1_PLANT);

The SRM M1-M3 offloading looks like:

SRM_OFFLOAD_OLG = SRM_M1_LOCK_FILTER * SRM_M1_PLANT * SRCL_sens * SRCL_Filter / (1-SRM_M3_PLANT * SRCL_sens * SRCL_FILTER);

Both of these are (or behave like) open loop gains (g), so the suppression/gain peaking can be show by looking at the 1/(1-g) for each.

I made a 50mhz boost filter for this and tried it during the commissioning window this morning. Bode plots for the boost (red), boost *m1 lock filters(blue) and the nominal M1 lock filter(green) are shown in the first image).  The affect on M3 drives and SRCL are shown in the second image asds, live traces are with the new boost, refs are without. There is good reduction below 100mhz, but there is gain peaking from the M1-M3 offloading at .2-.4hz. which might bleed into the secondary microseism during the winter. I'm working on a filter with similar gain, but less gain peaking in a region that won't affect the overall rms of the m3 drive as much. I will try installing and testing during maintenance tomorrow.