TITLE: 05/12 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 1mph Gusts, 0mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.17 μm/s
QUICK SUMMARY: Systems appear to be fully recovered after the h1susb123 crash and output arm turbopump shutoff this weekend. More vent work planned for today includes wrapping up HAM1 alignment and more wind fence work at EX.

I noticed that the pressure in the LVEA spiked up several hours ago, see attachment, typical behavior of a turbo pump turning off.  Drove to the site and found the output tube main turbo pump off, this system was isolated from the main volume first, then the turbo system was restored; scroll pump running, small turbo up to speed, and main turbo pump up to speed, only then the turbo system was valved in to the main volume.  Nothing out of the ordinary was found or noted.  As of now no power glitches have been reported.

At 15:36:55 Sun 11may2025 PDT all models on h1susb123 stopped due to an ADC/Timing error.

h1susb123 DMESG output:

[Sun May 11 15:36:49 2025] rts_cpu_isolator: LIGO code is done, calling regular shutdown code
[Sun May 11 15:36:49 2025] h1iopsusb123: ERROR - An ADC timeout error has been detected, waiting for an exit signal.
[Sun May 11 15:36:49 2025] h1susitmpi: ERROR - An ADC timeout error has been detected, waiting for an exit signal.
[Sun May 11 15:36:49 2025] h1susitmy: ERROR - An ADC timeout error has been detected, waiting for an exit signal.
[Sun May 11 15:36:49 2025] h1susbs: ERROR - An ADC timeout error has been detected, waiting for an exit signal.
[Sun May 11 15:36:49 2025] h1susitmx: ERROR - An ADC timeout error has been detected, waiting for an exit signal.
(diskless)controls@h1susb123:~$ 
 

Sun May 11 10:11:51 2025 INFO: Fill completed in 11min 47secs

Sat May 10 10:10:22 2025 INFO: Fill completed in 10min 18secs

After GV7 was closed, the HAM3 table optical lever transceiver components were removed, with the exception of the viewport guard assembly.  The items were on port VP7 of MCA1 module.

All items removed were stored in the optical lever cabinet, the cabinet is located at the south bay of the LVEA.

TITLE: 05/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
Bees:
There is a box potentially full of bees sat right next to a spool of wire and a chair at EX as the Bee keeper is trying to remove the beehive from the wire spool.
There is still a bee swarm near the gate as well.
 

HAM1 work:
The IST1 table has been moved back into place.
GV7 has been soft closed.
Rahul took some SUS transfer functions to check for rubbing.
Laser power was turned up at the Request of Camilla & Sheila to aid in finding the IR beam spot alignment on to the ISCT1 table.

Wind fence:
Wind fence team got another set of cables strung up for the WindX work down at End X 

GRB-Short E570982 @ 22:34:04 UTC
GRB-Short 570981 @ 22:35:15 UTC

Oli & Camilla took the Laser power back down to 2W for trhe night at 23:39 UTC. 

LVEA is still LASER hazard.

LOG:

Betsy, Camilla, Keita

I've written an EPICS IOC which reads the smart Geist rack power strips and records their current draw in Amps.

CDS racks in the MSR and end stations have two verically mounted, full height, power strips. Most MSR racks have a UPS power strip and a facilities power strip. Rack mount servers with dual redundant power supplies are connect to each power strip for fault tolerance. The MSR exceptions are racks 01 (fiber rack, has a single APC power strip) and the front end racks 03, 04 which have 3-phase power strips with no network connection. Front end computers are not UPS powered because their IO Chassis are also not UPS powered.

The end station racks have two power strips, but they are both on technical power, there are no FE UPS units in the outbuidings.

I have created an MEDM called H1CDS_PWR_STRIP.adl, it can be opened from the CDS pulldown on the SITEMAP.

The IOC calculates the total rack current draw, which is displayed in the circle. UPS power strips are denoted by their orange background.

Attached photograph shows a typical power strip configuration at the rear of a CDS rack, with the UPS strip using keyed outlets to prevent accidental connection to non-UPS outlets.

The MSR atomic clock has drifted sufficiently in the past 6 months to reach the edge of its 1uS tolerance, causing 1PPS Timing errors.

Note this is a gradual drift as opposed to the major jumps we had seen in 2023/2024. Those jumps were large fractions of a second each, requiring rsyncing the atomic clock back to the timing master. Daniel says this is not needed in this case of a gradual few microseconds per year.

I have adjusted the nominal time difference for the atomic clock from 0ns to 1000ns, keeping the tolerance at 1000ns.

Attached trend shows that the timing master itself is not the cause of the drift, as verified by the end station CNS-II GPS independent clocks.

Following the soft close of GV7 at 12:46 PDT I reconfigured the alarms system to expect this GV to be soft-closed.

We ended up using pico in HAM3 to bring down green ALS beam as well as IR POP rather than raising the top periscope mirror after confirming that it was safe to do so.

We first confirmed that the X arm and corner alignment were still the same as yesterday. X arm was still locked to 00 green, and when I misaligned PRM the IR flash in H1:LSC-TR_X_IN1 was reaching 0.8 or more.

We convinced ourselves that the alignmernt was reasonable and probably similar to the alignment before the vent, that the ALS beams were pretty high but was still hitting the top periscope mirror before just like ALSX beam is as of now. We discussed the use of the pico in HAM3 (instead of moving the top periscope mirror up) and decided that it's OK to do so as far as the IR beam is far from clipping somewhere in HAM2.

We moved the HAM3 pico for PIT in "Down" direction by 700 counts and the IR beam position looked about right. We moved the pico further down by 1000 counts (that's the total of 1700 counts down from the initial state) and the IR beam missed the bottom of the top periscope mirror but no sign of clipping in HAM2, so we were comfortable to go 1000 counts "UP" and search for an optimum positision. In the end we ended up going back to 700 counts "Down" relative to where we started.

Sheila and Camilla adjusted top and bottom periscope mirror. M10 (dichroich) was also touched up. Steering mirrors for in-air beams were also roughly adjusted, These are M7 (for REFL air), M11 (for green ALS), M13 (for IR ALS beam from the PSL) and M16 (for POP air).

Now we're ready to move ISCT1L in position to confirm that all beams hit the periscope mirrors on the table.

Gerardo, Jordan, Janos

GV7 (X-arm manifold) was opened today, to make possible HAM1 optical alignment.
13:06 - all the turbos were valved out
13:12 - the gate valve started to move up

After ~4 hrs, PT-144 (vacuum gauge next to CP2 on the beamtube side) is at 3.7E-8 Torr, the pressure in the corner is <1E-7 Torr.

GV7 stays open overnight, then tomorrow there will be some more alignment work (following aLog 84323), and then GV7 will be closed again.
The turbo pumps are still running, and after GV7 is closed, they will be valved back to the corner.

The RGA (p-t) scans of the main peaks will be posted - in particular during the closure and the opening of GV7

Oli, Keita, Elenna, Jennie, Sheila, Ryan S, Rahul, Betsy, Camilla

Day 1: 84193, Day 2: 84228, Day 3: 84230 and 84239, Day 4: 84274, Day 5: 84292

• To work on REFL beam: need PRM aligned and ITMX or ITMY misaligned 
• To work on POP flashes: need PRM aligned and ITMX aligned
• To work on POP single bounce (low power ~30uW into HAM1 POP path for 20W from PSL): need PRM and ITMY misaligned 

In the morning Keita and Jennie aligned the POP flashes on the periscope mirrors and M10 dichroic. The height of this beam is 3.75" on these mirrors to account for the ALS green beam being 13mm above the POP beam. Keita was a little concerned about the height of the top periscope mirror so we'll need to check the green ALS beam carefully on this and if it 's near clipping we may need some in-vac pico-ing.

Rahul then moved PM1 to it's final position. Elenna and Rahul checked that the signed of the PIT and YAW sliders were correct. 

Shiela, Rahul and I then worked on centering the beam on PM1 and L2 without the 90/10 M12 in place, so that we could later have enough power to beam profile the POP single bounce beam. To get the beam height back up to 4" at PM1, Rahul needed to pitch PM1 mechanically. 

Oli then increased PSL input power to 20W, we aligned to POP single bounce and Sheila and I took beam profile measurements before PM1 and after L2, details in 84307.

Elenna, Rahul and I then replaced the 90/10 M12 and recentered the beam on PM1 and L2. We started aligning the POP air path but aren't happy with it, dumped the beam and will continue to work on. 

Betsy let in the PSL ALS beam into HAM1 by opening the light pipe and I dumped it straight away. See 84312.

Today we plan to: align the POP, REFL and PSL ALS beams out of the chamber, open the X-arm check the green ALS beam alignment on the shared optics and off the table, including rolling up ISCT1 and adding the VP simulator. The POP LSC/ASC diodes and all beam dumps still need to be aligned and checked.