Dew point measurement done this morning, read at -43.4 ^oC.  There was some demand already on the system from HAM5, since both soft covers were off.  No demand from HAM6 or HAM7.  Flow was opened later to HAM6, since more personnel started working in-chamber.  HAM7 remains valved out.

I took the OPLEV charge measurement for the both the ETMs this morning as they were free. As I started I noted that ETMX had an FPU error (floating point unit), and during the measurement ETMY had lots of overflows, all stemming from H1:FEC-98_DAC_OUTPUT_3_3 (ETMX did not have any overflows).

To center the OPLEVs I had to do the following slider moves

ETMX sliders: P -42.7 to -57.8, Y -147.7 to -131.3

ETMX's charge appears to be increasing and high, its at or above 50V on all quads/DOF.

ETMY sliders: P 140.1 to 170.8, Y -162.8 to -149.0

ETMY's charge seems stable and low, hovering around 0-50 V on all the quads.

After I was finished I restored the sliders and re-misaligned the ETMs as they were when I found them.

Closes FAMIS#26001, last checked 79209

** This was run during the vent with HAM5 and HAM6 in ISI_DAMPED_HEPI_OFFLINE, and ITMX, ITMY, BS, HAM2, HAM3, HAM7, and HAM8 in DAMPED **

Things of note:
- Everything looking good and what we see lines up with the state that the chambers are in

Tue Jul 23 08:06:58 2024 INFO: Fill completed in 6min 54secs

Jordan confirmed a good fill curbside.

TITLE: 07/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 8mph Gusts, 4mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.06 μm/s
QUICK SUMMARY:

Planned for today:

- Continue aligning the AUX laser

- KTP swap

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

We aligned the AUX laser in HAM5 so that it is roughly centered on OM1 AND is retroreflected by SRM. We haven't checked anything else.

Retroreflection was measured/evaluated using an iris right in front of the AUX laser launcher telescope. First the iris was well centered relative to the input light (1st attachment shows the scattering around the iris when it was closed down a bit), and we used a steering mirror and a beam splitter installed between the AUX laser and the SRM to get the SRM reflection coming back to the iris AND SRM transmission hitting the center of OM1 without touching SRM. It was easy. 2nd attachment shows the return beam on the iris after REALLY closing down the iris so the return beam clips on it. Centering on OM1 was based on just eyeballing using a sensor card.

We don't know where on the SRM or OFI the beam was (no easy reference). It seems that the beam was seen by ASC-AS_C but not centered on it.

The above was done before we were informed about a large ISI/HEPI rotation in YAW (alog 79272) so probably we'll do it again after moving SRM to compensate to get closer to the right alignment quickly (rather than walking the beam from where we are now slowly, checking the OM1 centering and SRM retroreflection many, many times).

In the end, we should make the SRM transmission hit the center of AS_C, make the beam retro reflected by SRM, and make the SRM reflection hit the center of SR2, all at the same time. For that, probably we'll have to make a minor adjustment to SRM.

TITLE: 07/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Corey
SHIFT SUMMARY:
Many PSL and LAB Dust monitor alerts.
HAM5 & HAM7 ISI tripped due to activity in the chambers multiple times today.

IFO status update:
The OFI crew has been aligning the AUX Lasers on both sides of the OFI to get the lasers to line up. This may make the OFI replacement slightly easier.



LOG:

Jennie, Jim, Jenne

Sheila asked me to check the alignment of the SRM as it is with HAM5 ISI and HEPI lcoked vs. what it was when we were locking before the OFI damage.

I chose a state after DRMI_ASC_OFFLOADED so the SRM would be aligned (state 120 in ISC_LOCK which is CHECK_AS_SHUTTERS).

Between the first cursor (10th July) and now, SRM moved up by 67.7 uradians on the yaw slider, 70605 nradians on the HAM5 ISI RZ CPS, 900 nradians on the HAM5 HEPI RZ IPS. This resulted in an overall alignment change of +6.18 uradians on the osems.

This means that to move the SRM into this position again we would have to move up by 139.3 (67.7 + 70605e-3 + 900e-3) uradians on the sliders in yaw.

I checked with Jim about the channels to use on HEPI and ISI on HAM5 and we think the SRM yaw should have the same sign as the HEPI IPS and the ISI CPS as they both increased as the osem yaw values increased over this period.

Edit: Jenne pointed out since the osems are relative to the table, the change on the yaw sliders to get us back to our old SRM alignment should be

(6.18 + 70605e-3 + 900e-3) = + 77.7 uradians in yaw

So you should undo this with -77.7 uradians in yaw on sliders.

FAMIS tasks 24925 and 24949, WP 11975

Procedure checklist for both stations completed.  No issues were identified at this time.

MY: Scroll pump hours: 82.1

       Turbo pump hours: 218

       Crash bearings: 100%

EY: Scroll pump hours: 80.5

       Turbo pump hours: 1286

       Crash bearings: 100%

If you need to reach the Control Room, please use TeamSpeak or MatterMost as the VOIP phone system is currently down at least in the OSB.
 

The HWUT picket has been down for a couple of days following some malfunctioning (Reported in [LHO aLog 79076]). We also saw the spurious signals at Stanford. This station's malfunctioning means the picket fence is not giving the intended forewarning for events originating in South/Central America.

We'll find a replacement picket soon and upload a revised code during the week.

Please post any additional requests in here, or feel free to message me directly.

This morning I took a dew point measurement of the corner station purge air, same setup like here.  After measurement purge air was restored to all chambers.

Dew point measurement is -43.6 ^oC.

Closes FAMIS26274, last checked in alog79075

Laser Status:
    NPRO output power is 1.825W (nominal ~2W)
    AMP1 output power is 65.08W (nominal ~70W)
    AMP2 output power is 138.7W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 12 days, 22 hr 28 minutes
    Reflected power = 18.92W
    Transmitted power = 108.0W
    PowerSum = 127.0W

FSS:
    It has been locked for 4 days 19 hr and 1 min
    TPD[V] = 0.7416V

ISS:
    The diffracted power is around 2.0%
    Last saturation event was 5 days 20 hours and 13 minutes ago

Possible Issues:
    PMC reflected power is high, its been drifting up since 07/09 (2 tuesdays ago).

Daniel resynced the MSR atomic clock to the timing system 16:27 Friday 19th July 2024 PDT.

I have removed my large tolerance of 0.9999 seconds which I had used to 'green up' the corner station timing system.

Tony mentioned that the Verbal alarm had requested a check of the PSL chiller.  When I went in there, the water level was close-ish to the Min value. I added 125 mL of water.

Rick Savage, Dan Chen, Shingo Hido, Emmanuel Makelele and Dripta.

We went down to EY on Thursday, July 18th, 2024 to do a Pcal measurement, mostly to show the measurement procedure to our visitors. We used the procedure outlined in T1500062-V17 as a guide. A scanned copy of the filled out measurement procedures and log is attached.

Before we began the measurement, a picture of the beam spot position was taken. It shows that the beams were centered on the Rx sensor apreture (BeamSpotBefore photo attached).  

As noted in the scanned copy, after the first background measurement while WS was placed in the Tx module, the shutter stopped working. We could not open the shutter locally or remotely. The shutter has now been removed from the EY Tx module for troubleshooting. Pictures attached.

We continued with the measurement manually shuttering and unshuttering the laser. After taking all the measurements, a beam position picture was taken. It shows that the bemas remained centered and the Pcal beam spots did not drift significantly during the measurements (BeamSpotsAfter photo attached). 

Analysis and results/plots to follow.