TITLE: 07/24 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: 4mph Gusts, 2mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

Close to getting the AUX laser aligned (79291)!

TITLE: 07/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: None
SHIFT SUMMARY: Work today was just a continuation of work on aligning the AUX laser
LOG:                                                                                                                                                                                                                                                                                                          

Site wide power glitch at 13:43:30 PDT (20:43:30 UTC) Tue 23rd July 2024. Lights in corner station flickered. Both end station HEPI Pump Controller VFDs tripped.

Jim untripped the EX VFD, but the HEPI pump controller does not seem to have control. Jim and Patrick are investigating.

The ISI watchdogs for both ST1 and ST2 on the ETMs tripped seemingly randomly this afternoon at 20:43UTC. From the CPS sensors on ST2 and the T240s on ST1.

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.

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.