Bubba, Richard, Patrick, Dave:

The reverse osmosis system in the woodshop has been in alarm for over 24 hours, which has caused cell phone alarms to be sent.

While this issue is being worked, Bubba has requested the cell alarms to be bypassed.

Bypass will expire:
Sun 20 Aug 2023 11:32:36 AM PDT
For channel(s):
    H0:FMC-CS_WS_RO_ALARM
 

Thu Aug 10 10:25:32 2023 INFO: Fill completed in 25min 27secs

Note that TC-A was hovering close to the -130C trip point, and this fill was close to being timed-out at 30mins.

Follow up on previous tests (72106)

First I injected noise on SR2_M1_DAMP_P and SR2_M1_DAMP_L to measure the transfer function to SRCL. The result shows that the shape is different and the ratio is not constant in frequency. Therefore we probably can't cancel the coupling of SR2_DAMP_P to SRCL by rebalancing the driving matrix. Although I haven't thought carefully if there is some loop correction I need to do for those transfer functions. I measured and plotted the DAMP_*_OUT to SRCL_OUT. transfer functions. It might still be worth trying to change the P driving matrix while monitoring a P line to minimize the coupling to SRCL.

Then I reduced the damping gains for SR2 and SR3 even further. We are now running with SR2_M1_DAMP_*_GAIN = -0.1 (was -0.5 for all but P that was -0.2 since I reduced it yesterday). Also SR3_M1_DAMP_*_GAIN = -0.2 (was -1). This has improved a lot the SRCL motion and also improved DARM RMS. It looks like it also improved the range.

Tony has accepted this new configuration in SDF.

Detailed log below for future reference.

Time with SR2 P gain at -0.2 (but before that too)
from    PDT: 2023-08-10 08:52:40.466492 PDT
        UTC: 2023-08-10 15:52:40.466492 UTC
        GPS: 1375717978.466492
to      PDT: 2023-08-10 09:00:06.986101 PDT
        UTC: 2023-08-10 16:00:06.986101 UTC
        GPS: 1375718424.986101

H1:SUS-SR2_M1_DAMP_P_EXC  butter("BandPass",4,1,10) ampl 2
from    PDT: 2023-08-10 09:07:18.701326 PDT
        UTC: 2023-08-10 16:07:18.701326 UTC
        GPS: 1375718856.701326
to      PDT: 2023-08-10 09:10:48.310499 PDT
        UTC: 2023-08-10 16:10:48.310499 UTC
        GPS: 1375719066.310499

H1:SUS-SR2_M1_DAMP_L_EXC  butter("BandPass",4,1,10) ampl 0.2
from    PDT: 2023-08-10 09:13:48.039178 PDT
        UTC: 2023-08-10 16:13:48.039178 UTC
        GPS: 1375719246.039178
to      PDT: 2023-08-10 09:17:08.657970 PDT
        UTC: 2023-08-10 16:17:08.657970 UTC
        GPS: 1375719446.657970

All SR2 damping at -0.2, all SR3 damping at -0.5
start   PDT: 2023-08-10 09:31:47.701973 PDT
        UTC: 2023-08-10 16:31:47.701973 UTC
        GPS: 1375720325.701973
to      PDT: 2023-08-10 09:37:34.801318 PDT
        UTC: 2023-08-10 16:37:34.801318 UTC
        GPS: 1375720672.801318

All SR2 damping at -0.2, all SR3 damping at -0.2
start   PDT: 2023-08-10 09:38:42.830657 PDT
        UTC: 2023-08-10 16:38:42.830657 UTC
        GPS: 1375720740.830657
to      PDT: 2023-08-10 09:43:58.578103 PDT
        UTC: 2023-08-10 16:43:58.578103 UTC
        GPS: 1375721056.578103

All SR2 damping at -0.1, all SR3 damping at -0.2
start   PDT: 2023-08-10 09:45:38.009515 PDT
        UTC: 2023-08-10 16:45:38.009515 UTC
        GPS: 1375721156.009515

Spoke to Gabriele about these SDF Diffs and we are accepting them now.

Current IFO Status: 
Since Livingston is down for Logging, H1 Has intentionally dropped into commissioning.

 

TITLE: 08/10 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 145Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.08 μm/s 
QUICK SUMMARY:
 IFO H1 is locked in NOMINAL_LOW_NOISE and OBSERVING 

Following up on 71969, here are two examples of times where the bumps at multiples of 10 Hz were very visible. This seems to be the largest source of non-stationary noise and glitches at low frequency.

H1 had a lockloss at 7:05utc (1205amPT)---which was fairly close to lockloss with L1 which had all the earmarks of an earthquake, but did not see any signs on the SEI FOM.

Automation tried to bring H1 back, but unfortunately, it did not look good, so an Initial Alignment was automatically run from 733-759.  From 800-850 H1 worked on getting to NLN (received operator alert at 851utc)---because H1 was waiting for the CAMERA SERVO to get to OBSERVING.  At 910utc the CAMERA SERVO completed and H1 automatically taken to OBSERVING with little fanfare.

TITLE: 08/10 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY:

Lock#1:

Relocking from the lockloss right before I arrived, couldn't get DRMI or PRMI (No good flashes), went through CHECK_MICH then back to PRMI which loss lock, we then ran an initial alignment which went very smoothly. Back up to NLN at 00:16.

We noticed there was a large line at 102.1Hz upon getting to NLN which seemed to be lowering our range by 5-15 Mpc. It's shrinking as time goes on and our range is increasing as it comes down. There's also something on the 100-450Hz BLRMs during the same time frame, also decreasing. After 2 hours it was back down around if not below the reference

We had a range of 159.15 Mpc for a minute!

We dropped out of Observing due to the squeezer losing lock at 03:47UTC, back into Observing 03:50UTC.

The ISS diffracted power is low, DIAG_MAIN flashes a message about it every few minutes

LOG:                                                                                                                                                               

Closes FAMIS 25078

The charge measurements were not run this past Tuesday the 8th due to a lockloss and ALS-X issue, alog72054.

STATE of H1: Observing at 144Mpc

Wind: 29mph Gusts, 23mph 5min avg

We've been locked for 2:45, we reached 159.15 Mpc for a minute! The wind and accompanying ground motion has been increasing the past 2 hours.

Today I took "unbiased" OLGs of MICH P and MICH Y (see 67187 for a discussion of unbiased measurements and methods). These loops have not been measured since Gabriele and I updated the loop design in May (69370).

The templates for the these measurements are saved in [userapps]/asc/h1/templates/MICH as 'MICH_{P,Y}_olg_broadband_shaped.xml'. I obtained 40 averages at a 0.015 Hz bandwidth, so it took about 20 minutes to run each measurement.

I have plotted the open loop gain with error shading in the attached plots. You can find the same measurement templates, exported data, and processing code in '/ligo/home/elenna.capote/DRMI_ASC/MICH'.

MICH P appears to have a UGF of 1 Hz with a phase margin of 46 deg. MICH Y appears to have a UGF of 0.55 Hz with a phase margin of 35 deg.

I believe Gabriele and I sought to reduce the UGF of MICH Y more than MICH P because at the time, MICH Y contributed more to the ASC subbudget from 10-30 Hz. However, we are now seeing significant upconversion of low frequency motion in DARM that limits the sensitivity from 20-40 Hz. I will revisit this loop design and prioritize more low frequency suppression to see if we can reduce the DARM RMS further.

The changes in environmental coupling with the change from 75W to 60W ( https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=70808 ) require that we re-measure some of the coupling functions that were measured in the pre-run set of PEM injections in May. Today I began those injections by injecting acoustically in the LVEA, as well as shaking HAM6 and the ITMY cryopump. I also set up for acoustic injections at EX.

In addition Sheila and I did some bias manipulation for ETMX. I injected currents onto the EX building ground and swept the ETMX bias as I had in January (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=67075). The figure shows that there has not been much change in the bias setting that minimizes grounding noise.

Reducing the SR2 M1 DAMP P gain from -0.5 to -0.2 and the SRM M1 DAMP L gain from -0.5 to -0.25 did reduce the noise in SRCL and DARM between 3 and 8 Hz.

The main improvement was obtained reducing SR2 damping gain, When reducing the SRM L gain, the 1.3 Hz line appears to get larger. It's worth taking a look at the SRM damping loop and its interaction with the ASC and LSC loops to ttry to track donw the 1.3 Hz peak.

So SRCL and DARM are limited by SR2 P damping noise between 3 and 8 Hz. This change reduced DARM RMS by 20%.

Taking advantage of the fact that we're not locked, I put the missing ETMX "HFPole" filter module (LHO:72030) back in the H1CAL-CS_DARM_ANALOG_ETMX_L3 filterbank. From inspecting the filter archive, it looks like the "HFpole" ETMX filter module was removed on 4/25/2023. This is around the time we were rolling out the cmd-dev infrastructure for the calibration group. 

The plan is to follow up with a Broadband measurement later tonight or at the earlier opportunity to establish whether or not to keep this filter in place. 


The zpk string I used is zpk([], [3226.75],1,"n"). The value 3226.75 was calculated by summing the poles for all four ESD quadrants from LHO:46773 as per LHO:27150.

I've attached screenshots of the ETMX filterbank and the GDS TP window.

GDS table diff

324c324
< # DESIGN   CS_DARM_ANALOG_ETMX_L3 2 zpk([],[3226.75],1,"n")
---
> # DESIGN   CS_DARM_ANALOG_ETMX_L3 2 zpk([],[],9.787382864894167e-13,"n")
343c343
< CS_DARM_ANALOG_ETMX_L3 2 21 1      0      0 HFPole     4.158812836234200838170239e-01  -0.1682374327531596   0.0000000000000000   1.0000000000000000   0.0000000000000000
---
> CS_DARM_ANALOG_ETMX_L3 2 21 1      0      0 TEST_Npct_50W 9.787382864894166725851836e-13   0.0000000000000000   0.0000000000000000   0.0000000000000000   0.0000000000000000