WP13034

Fil, Dave, Daniel, Jonathan, Patrick, Sophie, Camilla,

Last week Fil and Daniel powered up the Cheta slow controls Beckhoff chassis in the MSR. It was sitting on a cart behind MSR02, connected to the MSR Chassis AUX-1 ethernet port with a short cat6 cable. Daniel added the AWS system to the SYS ECAT TCS CS PLC.

Today we moved the Cheta chassis into the Vacuum Prep Lab. It ethernt connection to the MSR chassis is now quite convoluted, a drawing can be found in D2600049

From the Cheta chassis the path is: cat6 cable to the wall RJ45 jack, building wiring connects this to the RJ45 patch panel in Room 163. Fil ran a cat6 cable from the patch, under the 163 floor, through a wall penetration to the CUR underfloor, then up to the wall mounted CUR CDS switch. This switch is connected to the MSR core switch, which in turn is connected to the FE switch in MSR04. A cat6 cable from this switch over to the Beckhoff chassis completes the link.

The link was tested in two stages. After Jonathan configured the core switch and the two edge switches to create a private VLAN connecting the switches, Fil moved the chassis into the CUR and connected it to the sw-cur-aux-stk port 1/1/7. I ran the above rack cat6 in the MSR from sw-msr-h1fe-stk 2/1/2 to the MSR chassis.

When powered down in the MSR DEV0 system went into a bad state. The H1:SYS_ETHERCAT_DEVICE_0_LOSTQUEUEDFRAMES channel (normally zero) accrued thousands of frames. The LOSTFRAMES (normally zero) became 13, the SLAVECOUNTACTUAL (normally 19) became zero.

When powered back up in the CUR, DEV0 status went green, the slave count went back to 19. The frame countered latched at their non-zero values. After Patrick reset them they stayed at zero.

Next Fil moved the chassis into the Vacuum Prep Lab, everything went green again and the frame counters stayed zero after reset.

FAMIS 31126

Not much to report this week. FSS has been on and off due to JAC installation and commissioning.

Picket Fence earthquake early warning system can't connect to station "UO_TOOM:HHZ", so we're only monitoring on four out of five stations.

Mon Feb 23 10:12:14 2026 INFO: Fill completed in 12min 10secs

TITLE: 02/23 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 16mph Gusts, 12mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.45 μm/s 
QUICK SUMMARY: HAM1 work continues today after the purge air issue this weekend.

Sun Feb 22 10:10:32 2026 INFO: Fill completed in 10min 28secs

Sat Feb 21 10:11:00 2026 INFO: Fill completed in 10min 56secs

When checking the Kobelco unit this afternoon, I found there was a standing puddle of water (~1/4in deep) on the right side (looking at control screen) of the enclosure. Moving to the back side it was found to be a leak in the aftercooler auto drain line, right at the isolation ball valve. There was a continuous spray of water coming from the threads on the upstream side of the ball valve.

The dewpoint at the drying towers was still -81C, same value as this morning, so it did not cause any issues downstream of the compressed air line. The drained water was simply collecting in the bottom of the enclosure instead of flowing out of the drain line.

There was no in-chamber work happening at HAM1 at the time of discovery so after a phone call with Gerardo, I shut down the compressor unit and isolated the air line between the compressor and the receiving tank. I then closed the purge air inlet valve at the HAM1 chamber.

There is currently no purge air going to the LVEA.

Jennie W, Keita K, Rahul K, Ryan S,

This morning Keita turned the power up to 1 W and the purge air down in order to scan the OMC and measure the modulation index.

We had some work to do to lock the JAC, the cavity wouldn't scan properly when managed by the guardian code.

Ryan and I have looked back at it and think there may be something wrong with the feedback to the PZT. It can't be the PZT itself though, because Keita and I were able to lock on the TRANS PD signal with the dither locking done manually by tuning the PZT offset to find the resonance and then turning on the feedback.

I have enclosed a picture to aid problem solving next week.

We then had problems keeping the IMC locked so Keita had to change the threshold used to check if the cavity is locked down to 2. This was changed at line 133 in ISC_library.py at userapps/h1/isc/guardian/.

trans_pd_lock_threshold = 2

We then managed to do three scans,

one with 45 MHz off, one with both on, and one with 9 MHz off. Detailed analysis in progress.

After turning the power back down Keita and Rahul swapped the mirror we currently have in front of the TRANS PD, with the uncoated laser window that is meant to be there (JACT_BS1).

They had to top gun and swab it to remove two dust particles first.

This replacement means the power to the PD is lower and so we needed to power up to 1W to check this alignment.

I have left the mirror we took out on the table on the -Y side labelled as 'HR mirror taken out of JACT-BS1'. Need to check which exact mirror this is with Masayuki on Monday.

Keita locked the cavity manually with the REFL PD and optimised the amount of light falling onto the TRANS PD.

I powered down to 100mW and de-energised the rotation stage and closed the light pipe at the end of the day. We also had the rotation stage de-energised and locked out when we were working in chamber.

Modulation index measurement for 45M and 9M, they're healthy.

1W into JAC, no WFS for IMC, ITMY single bounce. Scanned OMC with both 45MHz minimal power (~4dBm) and 9MHz full (~27dBm), then both in full power, then only 45MHz in full (see screen shot).

Jennie will post the modulation index later, but the peaks look healthy to me.

The alignment into IMC was rather off in PIT and the guardian had a hard time locking IMC (I changed the lock threshold in the guardian). We didn't move MC, didn't bother to do any thorough investigation, but either JAC or MC mirrors moved. Maybe we have to lock IMC, use WFS for MC, and steer JM3 and see if the MC mirrors will be driven far from where they are. If they are we might have to touch up in-chamber alignment again.

JAC TRANS BS was swapped with the real one (laser window with AR only on one surface).

We replaced the JAC TRANS BS (which was a temporary high reflector until today) with the real one that is just a bare glass (the reflectivity is 7% or so depending on AOI). 

We locked JAC with RF, was able to see the beam coming to the TRANS PD but wasn't able to see the reflection of PD, so we raised the power to 1W.

Initially the beam was missing the PD because the new optic is thinner than the temporary one. We realigned the optic to steer the beam back to PD. Since we could not directly see the PD surface, we just steered the beam up and down, left and right until the PD output starts to drop, and put the beam roughly in the middle.

We were able to see the PD reflection using an IR card and an IR viewer. There were two reflection blobs (which was the case before, too),  and I moved the JAC TRANS BD in +X direction by 1/4~3/8" to catch both.

TITLE: 02/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in IDLE for PLANNED MAINTENANCE

Calm day. HAM1 work continued.

LOG:

Famis 39976 Inspect quarterly trends of HWWD bits for indication of negative function. 

All traces have had some motion on it in the last 91 days.

Yesterday afternoon I glued prisms to the LO2 optic for HRTS - see pictures attached.

This optic (D2100495-V5-LO2-M1-0002) will be shipped to LLO.