TITLE: 02/18 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: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.44 μm/s 
QUICK SUMMARY:

More HAM1 work today

TITLE: 02/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: N/A
SHIFT SUMMARY: Busy day today! The HAM1 EOM was moved to it's final position this morning, JM3 was placed in position downstream of the JAC, and recovery of beam alignment into the IMC is ongoing. Cranes were worked on in the LVEA as well today.
LOG:

This morning we have pushed the JAC EOM by about 0.6mm (using ~25 thou thick washers) in -Y direction, following the finding of last Friday (alog 89158). 

After that the beam was good on the input side plate (the beam is offset in +Y direction by 0.1mm) and was OK on the output side plate (0.5mm offset in -Y direction).

The beam position on the crystal itself should be ~0.13mm in +Y direction on the input face and ~0.36mm in +Y direction on the output face. The angle between the nominal path and the actual path outside of the crystal is about 0.6 degrees. See pictures and cartoon.

Calculation depends on the refractive index, I assumed n~1+deflection/wedge=1+2.35/2.85~1.85, but using 1.85+-0.5 instead won't change anything in a meaningful manner.

This is acceptable, the beam is more than 1.5mm away from the side face of the crystal, cannot remember the beam radius but it should be smaller than 600um if FDR is still valid, so it might be 2.5 beam radius or maybe more.

FAMIS 39953

Starting about two weeks ago, the pressure at the EX station started getting more "noisy" for some reason. Not sure why this would happen or how significant it is, but noting it here just in case.

Jennie W, Ryan S, Keita K

Summary: MC suspensions back to good time from 10th of Feb, we should only lock the IMC length loop manually during this installation period to avoid the WFS engaging.

Today Ryan and I had the task of figuring out why the IMC suspensions seemed to be badly aligned on Friday.

We found a good reference time 16:48:29 UTC on Tuesday 10th Feb at the end of the period where Olli, Jenne and I set the IMC axis back to its nominal state before the vent using ASC loops for DOF 1 and 2 of the IMC plus manual moves of the JM3 mirror in chamber as this cannot be moved by an ASC loop as it is not a tip-tilt currently. See photo of the WFS and MC mirror top mass OSEMS here. Note it is important to choose a time when IMC is in the locked state as the MC2 mirror gets mis-aligned when the IMC guardian is offline.

We figured out that the alignment was changed about 19:33:17 UTC on 13th Feb probably by the IMC guardian as Elenna used it to lock the IMC for phase check measurements. See photo, where the vertical cursors are set at the good reference time and today.

After some investigation of the guardian we reminded ourselves that DOFs 3-5 are turned off in the IMC WFS MASTER filter banks. DOF4 and 5 are normally off and DOF3 is intentionally left off because of the replacement of PSL PZT actuator by JM3.

When the IMC guardian is used to lock it automatically triggers the WFS through some logic from the simulink model, and so when Elenna used the guardian to lock it turned on the feedback to DOFs 1 and 2.

Until we install the JM3 tip-tilt and are finsihed most commissioning of the HAM1 hardware we should only lock the IMC manually by engaging the MC-L servo using the common mode servo board controls.

Keita and I zeroed the M1 LOCK fiters for all 3 MC mirrors and I changed the alignment sliders so the M1 osems were back to their values from the reference time on the 10th. See photo of ndscope.

Closes FAMIS#28228, last checked 88988

TCSX: 30.5 - Did not add water

TCSY: 10.4 - Did not add water

Flow and filters looked good, but had to remove a notification about preventative maintenance for the filter for both chillers (TCSX, TCSY) in order to see the flow rates. 

No leak in water cup

Workstations were updated and rebooted.  This was an OS packages update.  Conda packages were not updated.

Tue Feb 17 10:13:47 2026 INFO: Fill completed in 13min 43secs

FAMIS 31125

Since the FSS and ISS were re-enabled last week, things have generally been stable in the PSL. The RefCav could probably use some alignment touchup, but it's not too bad for now.

FAMIS 39751

Laser Status:
    NPRO output power is 1.834W
    AMP1 output power is 70.51W
    AMP2 output power is 138.8W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 3 days, 19 hr 53 minutes
    Reflected power = 26.72W
    Transmitted power = 103.9W
    PowerSum = 130.6W

FSS:
    It has been locked for 3 days 15 hr and 53 min
    TPD[V] = 0.4774V

ISS:
    The diffracted power is around 4.0%
    Last saturation event was 3 days 19 hours and 53 minutes ago

Possible Issues:
    PMC reflected power is high

TITLE: 02/17 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: 8mph Gusts, 5mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.39 μm/s 
QUICK SUMMARY: The HAM1 JAC EOM will have some slight alignment adjustments made today before placing the JM1/3 suspensions in their proper positions. HAM7 continues to pump down.

Mon Feb 16 10:13:39 2026 INFO: Fill completed in 13min 36secs

Sun Feb 15 10:13:40 2026 INFO: Fill completed in 13min 36secs

Sat Feb 14 10:14:53 2026 INFO: Fill completed in 14min 49secs

Dave, Oli, Marc, Fil, Rahul

This morning I switched PM1 (Tip Tilt suspension) in HAM1 chamber from safe state to damped state and immediately the DAC output was saturating. I suspected purge air (which Travis turned it down twice during the day) and later Masayuki also covered PM1 with foil. However, nothing stopped the suspension from saturating.

Then Oli, Dave and I did a model restart and later I power cycled the Satamps for PM1 in the LVEA - nothing helped.

Next, Marc, Fil and I went to the LVEA (checked the satsamp, which was fine) and CER and found the Coil Drivers to be faulty.

New Coil driver - E2400048 s/n 22001180

Old Coil Driver - E2100430 s/n S1106046

SUS PM1 is now not saturating. I will perform the heath checks later on.