While investigating the signal on the Y Manifold Cryo Acclerometer, we found that the power conditioner module was not functioning.  We moved the signal to a spare channel and verified that the rest of the signal chain is working.

Robert wants to get the LigoCam software working before we make any other changes to the PEM system, so we are holding off on replacing the channel.

The Y Manifold Cryo Accelerometer signal input and output was moved from S2300063 Channel 15 to S2300065 Channel 15 (one chassis down)

I placed a rubber BNC cover on the bad channel to mark it for repair once we get the green are sure the LigoCam software is working correclty.

The LVEA was swept by Camilla, she will add notes.

Relocking has started.

Jennie, Jenne, Keita, Camilla 

Following 76883, we repeated by moving IM1 Pitch and Yaw then IM2 Pitch and Yaw in turn and recentering the beam on the IM4 TRANS QPD using IM3. Went in both directions until we either saturated the suspension or starting clipping on the Faraday. 

Results: We are not close to clipping FI so reverted the alignment to the original (though TJ said these IMs can have hysteresis).

Steps taken:

• Misaligned PR3, aligned PRM (so we can see REFL beam). 
• We tried using DC centering loops but this wasn't easy to implement so we didn't use them: Jennie copied filters from DC centering loops into DC7 FM2 as 2304_Test, we edited ASC matrices for IM4 Trans > DC7 > IM3. Turned on DC7 gain, IM4 trans didn't really converge, tried + / - gains. Not worth our time.
• Plots from the QR code in G2201230 show the beam radius is around 2mm though IM1 to IM4. Keita points out there is other apertures in this path that may be tighter than the FI. 
• For IM1 Pitch and IM2 Pitch and Yaw, we saturated suspensions (IM2 or IM3, details in pdf)  before clipping the Faraday.
• For IM1 Yaw we stared clipping the Faraday just before IM3 saturated.
  • When we went to the middle position between the two clipping edges (and recentered with IM3) the IM4 TRANS NSUM power was the same as the nominal IM1 Yaw position to within 0.1% so we reverted to nominal. 
  • Nominal IM1 Yaw: -384. Clipping edges: -884 and +416. Center or clipping edges: -243.
  • <0.1% change in IM4 TRANS NSUM power between -384 and -243 alignment,  so we reverted to nominal. 

Minhyo, Sheila

Changed the gain values of the RANGE BLRMS's filters (RLP_1 ~ 7) at 17:48:44 (UTC).
I referenced the accumulated BNS range in Apr.-11 and Apr.-17, to reverse calculated the additional factors for the filter gains (1/BNS = scope * factor).
The New gain values are defined as (Prev. gain) * (Avg. Factor).

Attached three screenshots are; 1) Accumulated BNS range plot, 2) Factor calculation, 3) H1OAF.diff after made all changes.

Tue Apr 23 10:11:09 2024 INFO: Fill completed in 11min 5secs

Karmeng, Camilla. H1:SQZ-SHG_FIBR_REJECTED_DC_POWERMON power was high. Adjusted the 1/2 and 1/4 waveplate to reduce rejected power from 0.3 to 0.03. Instruction

WP11816 Add CAL GDS_HASH channel to DAQ and GDS Broadcaster

Jamie, Erik, Jonathan, Dave

A new channel, H1:CAL-CALIB_REPORT_GDS_HASH_INT, as added to the cal_hash_ioc EPICS IOC. It was added to the DAQ via EDC, and also added to the DAQ GDS-Broadcaster for transission to GDS.

The new channel is being monitored by the CDS SDF.

WP11821 New h1asc model

Jeff, Dave:

We installed Jeff's new h1asc model. DAQ restart was required for the addtion of 4 slow chanels.

WP11822 FMCS STAT upgrade

Erik, Dave:

Erik installed new FMCS STAT code. This also added new channels to the DAQ, requiring a DAQ+EDC restart.

DAQ Restart

Jonathan, Dave:

Jonathan made the recent GDS Broadcast channel additions permanent in puppet and regenerated the GDS channel lists.

We restarted the DAQ and EDC for the above changes. No issues with this restart.

TITLE: 04/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Idle
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENNANCE
    Wind: 5mph Gusts, 3mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY: IFO lost lock a few hours ago and has been losing lock around transition to ETMX even though it isn't windy. I've put it into IDLE since maintance activities have already began.

Workstations were updated and rebooted.  This was an OS package update.  Conda packages were to affected.

TITLE: 04/23 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

Lots of EQs from Taiwan today, only 1 lockloss from them. The range has been lower today, the high frequency squeezing doesn't look as good as usual.

Lock#1

• 21:18 UTC Observinghttps://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1397866956
• 00:22 UTC lockloss

Lock#2

3 more EQs from Taiwan (4.5, 5.8, 5.2) came through while I was trying to relock.

LOG:                                                                                                                                                                                                         

Right click on an MEDM window, select Execute -> Search Model.

Then click on a channel.  A browser will pop up showing the design of the model that generates the channel.

Thanks to Takahiro Yamamoto for the code.

You might have to log out and log back in to see it.

We've been locked and observing for 1:40 following the lockloss at 00:22 UTC, range is lower this lock (High frequency SQZing doesn't look the best).

No obvious cause, https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1397866956

Closes FAMIS 26296

No big items to note.

The noisiest fan for the OUT buildings was MY_FAN2_270_1

The noisiest fan for the CS buildings were MR_FAN5_170_1

TITLE: 04/22 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: Was able to relock this afternoon during a lull in earthquakes from Taiwan just in time for a candidate event to come in. BNS range is on the lower side; Camilla comments that SQZ doesn't seem to be tuned well.

• 20:00 - Taking over from Corey
• 20:22 - Seismic back to CALM, starting lock acquisition
• 21:15 - Reached NLN
• 21:18 - Started observing
• 21:35 - S240422ed
• 21:53 - EQ mode activated

LOG:

TITLE: 04/22 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 158Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 5mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY:

• Lots of earthquakes today
• We've been Observing for almost 2 hours, since 21:18 UTC

Minutes before noon and before H1 would hit 22hrs, H1 lost lock most likely due to an earthquake(s) (M.6.1 to 6.6) from Taiwan although it's R-Waves are still inbound.  Taiwan has had multiple M5+ earthquakes since 2am (local) this morning!