TITLE: 10/08 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.21 μm/s
QUICK SUMMARY:

IFO is LOCKING and in MAX_POWER

PSL is glitchy, and comissioners are unsure of what it is, even after troubleshooting today. It's still causing FSS Lockloss issues.

TITLE: 10/08 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY:  Currently relocking and at MAX_POWER . We took a few extra hours after the normal maintenance period to continue troubleshooting the PSL issues, but it didn't come up with much.
When I took SEI_ENV to MAINTENANCE we lost lock (most likely due to increased ground motion from septic tank truck + MAINTENANCE mode switch)

LOG:

14:30 Locked for 3 hours and running magnetic injections
14:40 Injections done, back to Observing
14:45 Out of Observing, starting In-Lock SUS Charge measurements
15:10 Took SEI_ENV to MAINTENANCE
15:10 Lockloss due to ground motion while in MAINTENANCE

15:28 ISC_LOCK to IDLE

21:46 Sensor correction turned back on
21:52 Started manual initial alignment
22:29 Started relocking                                                                                                                                 

A new MKS pressure gauge was installed today on the FC-C3 tube section, on cross C7. 

FC gate valves, FCV7 & FCV8 were closed to isolate the C7 cross. The +x port angle valve remained closed, and a tee, gauge, and pump out port were installed. CF flange joints were helium leak checked, no signal found above detector background ~8E-10 Torr-l/s.

Volume was pumped to medium vacuum and volume remains isolated. Will need additional pumping and power/signal cables landed before joining with main FC volume.

WP12122 HEPI HAM2 model change

Jim, Erik, Dave:

Installed Jim's new h1hpiham2 model, has new top level signal connections. No DAQ restart was required.

WP12123 Alarm system use Twilio for cell texting

Dave:

Because of recent issues with bepex being unable to send text messages to verizon.com for several hours at at time, I created a test alarm system which uses both bepex and our 3rd party texting service Twilio. I will run the old and new alarms side-by-side for testing.

WP12125 CP1 Fill Time Change.

Dave, Janos, Gerardo:

CP1 fills happen at 8am during the summer before the dewar gets full sun and the head pressure increases. This is not needed during the winter, so I've reverted the fill time to 10:00.

Note that after the CP1 vaporizer disconnect work this morning, we did not need a second overfill run.

EX CNS-II independent GPS receiver failure

Dave, Daniel, Erik, Fil

(see Erik's alog for details). At 03:54 PDT this morning the EX CNS-II GPS receiver stopped running correctly:

The 1PPS became a noisy signal with an 8 second repeat.

The IRIG-B signal became a flat noise signal with a 1 Hz spike

The GPS MEDM froze at the last good values.

After its 12V DC wall-wart was replaced it is working agains.

The H1:CAL-PCALX_IRIGB_DQ channel was down between the times

Timing Master port 7 activation

Dave, Daniel, Erik, Fernando

The MSR Timing Master port7 is temporarily connected to a timing card in the spare Beckhoff computer. Normally this computer is powered off.

This morning Fernando powered the computer up for updates. The MFO went into an error, correctly reporting a spurious signal on port 7. To green up the master, I activated port7. When Fernando powered the computer back down I returned the port to its deactivated state.

Last checked in alog80348

Nothing really of note, for the OUTs MY_FAN2_270_1 is a little noisy, along with MR_FAN5_170_1 at the CS.

Still down for maintenance and it will be up to two more hours before we can start relocking - some investigations/experiments will be done to try and narrow down the cause of the FSS issues.

The independent GPS receiver at EX has failed. It 1PPs signal into the comparator starting oscillating at 03:53 this morning. Its MEDM screen is frozen from that time.

Erik is on his way out to EX to investigate

Before this morning's lockloss until 15:20UTC, we left CO2X and CO2Y on at their nominal annular powers (1.7W into vac) so that we could measure the IFO beams absorption on the ITMs using the HWS data.

B. Weaver, J. Kissel
WP 12109

Betsy, myself, and several others are looking to propose redlines to the WHAM3 flange cable layout (D1002874) in prep for O5 (see T2400150 for DCN and discussion there-of). 

However, in doing so, we discovered that the flange layout may have double-counted the shared cable for the MC2/PR2 M1 (top) RTSD / T1T2 OSEMs. Other drawings (e.g. the Cable Routing D1101463 and the wiring diagrams D1000599) indicate "yes, there's an extra 'SUS-TRIPLE' entry somewhere between the D6 and D3 allocation," but we wanted to be sure.

As such, Betsy went out to HAM3 today and confirmed that YES the MC2/PR2 M1 (top) RTSD / T1T2 cable, labeled "SUS_HAM3_002" in the wiring diagram or "SUS-HAM3-2" in real life, does come out of D3-1C1 and *not* out of any D6 port, and thus we validate that D6's list of 4x DB25s to support the 'SUS-TRIPLE' (i.e. MC2) in D1002874 is incorrect.

Pictures attached show the D3 flange, and highlight the SUS-HAM3-2 cable at the flange going to D3-1C1, and then the other end of that cable, clearly going into the MC2-TOP/PR2-TOP satamp box in the SUS-R2 field rack (S1301887).

Oli, Camilla

Oli found there was 3 sdf diffs after the in-lock charge measurements this morning. One was from lscparams.ETMX_GND_MIN_DriveAlign_gain being changed and th SU_CHARGE guardian not reloaded, the others it seems from an out of date filter and the original tramp ot being reverted correctly. The tramp wasn't explicitly changed but was ramped using a different than nominal value ezca.get_LIGOFilter( ... ramp_time=60).

Code changes attached and all sus charge guardians reloaded.

H1 called cause ITMX ISI watchdoog trip.

Our range has increased back to around 160 Mpc on the CALIB CLEAN channel the past few days. I ran the DARM integral compare plots using an observing time on Sept 28 (before OPO crystal and PRCL FF changes) and Oct 5 (after those changes). It appears the largest improvement has occured at low frequency. Some of that can be attributed to the PRCL feedforward, but not all. Based on the previous noise budget measurements, and the change in the coherence of PRCL from Sept 28 to Oct 5, I think the improvement in DARM from 10-30 Hz is likely due to the PRCL improvement. Above 30 Hz, I am not sure what could have caused that improvement. It doesn't appear there is much improvement above 100 Hz, which is where I would expect to see changes from the squeezing, if it improved from the OPO changes.

Sheila, Camilla.

New SQZ ASC using AS42 signals with feedback to ZM4 and ZM6 tested and implemented.  We still need to watch that this can keep a good SQZ alignment during thermalization. In O4a we used a SQZ ASC with  ZM5/6, we have not had a SQZ ASC for the majority of O4b.

Prep to improve SQZ:

• No squeezing from 15:31:30 to 15:41:30UTC.
• Adjusted OPO temperature following no observing instructions in 80461. Measured NLG to be 12.8. (0.1165/0.0091) following 76542.
• This improved the squeezing from 2.5dB above 300Hz to 3dB at 300Hz and 4.2bD above 1kHz.

Testing ASC from 80373:

• Ran the "reset as42 nosqz" offsets script while in no sqz. SDF accepted.
• Put the input matrices form 80373 into SQZ ASC and checked they were diagonalized correctly by moving ZM4/6 in turn and watching ASC_POZ/ANG input signals. ZM4 pitch wasn't completely diagonalized but that others looked good.
• Reduced ASC_WFS gain from 0.1 to 0.05, cleared histories, set all ASC_POS/ANG gains to 1 and one at a time turned on the inputs. We had some troubleshooting with POS_Y but there was a minus sign inside one of the filter banks we hadn't seen. In this troubleshooting we found the matrix was mostly diagonal so removed the cross-coupling terms for the YAW input matrix.
• Found WFS gain is better with lower WFS gain to 0.01 so we took a factor of 100 for the input matrix and left H1:SQZ-ASC_WFS_GAIN at 0.5. Accepted all in sdf. And edited sqzparams and reloaded SQZ_MANAGERT to turn on SQZ ASC.
• To test, we tried the "offload AS42 ASC" script with the plan to compare the AS42 alignment with the alignment from the guardians scan SQZ alignment. The script didn't work as expected, it's hard-coded to offload ZM45/6 rather than ZM4/6 that we are now using, we should fix this or go back to using ther guardian states. After turning off the ASC and running again to clear histories, this caused a lockloss, probably as ZM6 P moved 60urad in 0.3s. See attached lockloss plot.

starting at 16:48 UTC, we have the IMC locked with the NPRO temperature at 0.3, compared to -0.18 for the last 1.5 years (the medm screen says this is in units of K).  This was a suggestion from the PSL team to see if our problem is that the laser is near mode hopping. 

Pictures of feed throughs on the HAM6 chamber. These reflect the current layout as per D1002877 V14. In order there are three pictures of each D3, D4, D5, D6 and the -Y door.