Sun May 25 10:12:57 2025 INFO: Fill completed in 12min 53secs

Sat May 24 10:16:47 2025 INFO: Fill completed in 16min 43secs

TITLE: 05/24 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

IFO is in ENGINEERING and DRMI has Locked! IFO is in DOWN until Tues.

The relock acquisition today was a success! While the expectation was to get through ALS before facing issues, we managed to lock DRMI and get all the way to CARM_TO_REFL (state 409).

Of note is that the BS is slightly off in that when we do lock DRMI, the AS camera shakes for a bit and the POP90 trace gets very noisy emulating the jitter almost. I can see as this is happening, F2 and F3 OSEMs are saturating indicating something off in the MICH length loop. Elenna lowered the gain slightly and while this allowed us to get past the DRMI state, it came back upon passing that state 409. As the PR_GAIN is ramping up, the trace either jitters before losing lock or it just loses lock very instantly. The current hypothesis is that this is something to do with the BS particularly in the MICH Length Loop.

For some reason, in our most recent lock attempt, the issue did not happen with the only configuration difference being that the WFs centering was turned on and correct. However, we still had that sudden lockloss at CARM_TO_REFL so the issues may not be related.

See Elenna's alog 84569 for details on tonight's recovery and lock reacquisition.

Other:

DC centering loops on the input matrix for the REFL WFs were flipped and oddly saturating RM2. Elenna discovered this after some troubleshooting and unflipped it - they were SDF accepted s well.

LOG:

None

Ibrahim, Elenna

In summary, we can make it to CARM to REFL!

Here are some notes about recovering lock. I am bolding the ones that I think are urgent/should be read by anybody who next attempts to lock this IFO.

• Before we even started this process, I set all DRMI and PRMI ASC to false except MICH ASC.
• Locking green arms is a very "smooth" process (read: ALSY sucks a normal amount)
• Locking ALS proceeded without any hitch, as well as the find and check IR states.
• I first had problems with acquiring DRMI, even though at first glance the POPAIR flashes looked good. I tried PRMI, with good flashes, still no luck. I eventually had to go through MICH fringes, even though we had just run a successful initial alignment.
• Any state where the power needs to change requires manualing in one or more guardians- the laser power guardian stalls because it gets stuck in some "10W idle" state.
  • This is likely due to miscalibration in the rotation stage. If you get stuck, just manual to the power you need!
• After MICH fringes I went back to PRMI, and moved the PRM endlessly with no luck until I nudged the beamsplitter and everything immediately locked. Puzzling, because we had run at least two different MICH alignments at this point.
• Even with PRC1 disabled in PRMI ASC, the guardian still runs WFS centering on ALL WFS, which means it will error because the WFS centering isn't working well on the REFL WFS right now. I again had to manual around the WFS centering stage so it could offload MICH alignment.
  • this ended up being an SDF error which I fixed, see further notes
• Manualing around in ISC_DRMI seemed to stall things out, and since I was playing fast and loose with the guardian, caused a lockloss when I clicked "init" (I was trying to remanage guardians).
• Next lock went fine and I went straight to DRMI lock. (no need for PRMI or MICH fringes)
• when DRMI caught lock, the AS AIR camera started shaking. Ibrahim saw that it was the beamsplitter, specifically F2 and F3 osems seemed to briefly saturate. I averted this problem by turning the LSC MICH gain down by 10% (MICH2 gain from 1 to 0.9).
• Guardian got stuck in acquire DRMI 1f because the WFS centering on REFL failed again. I manualed over again to avoid it.
• Everything proceeded very well, the alignment looked great, I ran all the way to "CARM to REFL" and something started shaking.
  • At lockloss, there was a beamsplitter saturation warning, so I think something is funky in either the MICH LSC or ASC loop.
• Next two lock attempts still required reduction of MICH LSC gain to get through DRMI.
• However, through the CARM offset reduction, Ibrahim and I could see a small oscillation in POP90. It seemed to go away when I put the LSC MICH gain back up to nominal. However, still a lockloss at CARM to REFL, but much faster this time.
• The FSS got stuck in an oscillation again and I toggled the autolock to get out of it.
• The WFS centering keeps saturating the RMs and I am not sure why. I tried to move the RMs to center on REFL A and B but got saturation warnings as I got the beam closer to center on the diodes.
  • This turned out to be because the input matrix values were flipped! Keita had changed the DC1 and DC2 input matrix values about two weeks ago, since REFL A and REFL B had been flipped in the electronics.
  • However, it appears this was never SDFed, and got reverted. Once I re-flipped the matrix, the WFS centering worked perfectly. SDF screenshot attached
• When relocking DRMI after I fixed the WFS centering problem, there was no more MICH LSC oscillation. The reason for this is not immediately obvious to me, since the WFS centering only effects the REFL WFS (not in loop at this time)
• One more time, I tried going through CARM to REFL. I stepped through the state by hand and found that the lockloss occurs at the last step, where the input matrix is loaded
  • # Transition between TRXY and REFLAIR

    ISC_library.intrix['REFLBIAS', 'TR_REFL9'] = 2.0 #put back from 3.0 to 2.0 on 09/10/2018

    ISC_library.intrix['REFLBIAS', 'TR_CARM'] = 0.0

    ezca['LSC-PD_DOF_MTRX_TRAMP'] = 0.2

    time.sleep(0.1)

    ISC_library.intrix.load()

Sheila, Camilla, Elenna, TJ

• Picking up where we left off in 84554, we started by checking our alignment:
  • ran TMS + ITM baffle PD scripts
  • both ETMs were off in yaw, adjusted, locked green and ran ETM + TMS green WFS. ALS-C_TRX is at 1.2, TRY is at 1
  • Camilla realigned IMs, to where they were according to top mass osems at our last DRMI lock before the vent.  She adjusted IM3 to bring the position on IM4 trans QPD back to where it was at that time, and we had flashes of 0.6 in the LSC_TR_X channel (normal value is 1, this should be good enough to lock).
• Pop45 has no error signal.  Turned on sidebands (!), reset POP 45 dark offsets, which are hardcoded in ALIGN_IFO for this state, adjusted POP45 demod phase by 90 degrees, realized this was the wrong sign and finally adjusted it to -78 degrees which is accepted in SDF, then xarm locked. 
• TJ and I went to the table in the meantime, and aligned the PSL beam through the ALS SHG. TJ aligned the COMM beatnote easily, +3dBm, took a break for a big EQ.
• The SHG green power monitor PD doesn't seem to be working, we tried to follow the cable but got confused, the digital channel doesn't respond to room lights or phone. 
• Locked PRX, Elenna aligned PRM by hand, Sheila and TJ realinged REFL air path (for the first time).
• After  lunch we aligned DIFF beatnote getting to -11dBm, easiest to start by co-aligning the ghost beams off the PD.  Camilla found this new technique for this normally difficult alignment that seems much easier than our usual approarch. 
• The POP and RELF air beams were only ~1.5" or so apart on the top periscope mirrors. We are unsure why this changed and checked the alignments from when they were we aligned to the top periscope mirrors 84344.
• Camilla and I couldn't bring the mirrors close enough to have one mirror on each beam so we moved the periscope ~1" in +X and 1" in -Y to ge them both on the +X top periscope mirror. They are on their separate lower periscope mirrors.
• We aligned the REFL path and checked all stray beams were dumped
• We aligned the POP path onto, the beam was hard to see but we got some signal on POP A,  we expect enough to lock with, we can optimize alignment later.

TITLE: 05/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY:

Commissioners continued making progress with being to align more cavities/states of H1.  And the plan is to continue with more alignment work (Maybe locking tonight for Elenna & Ibrahim?).
LOG:

• Sheila sorting through H1 alignment enough to make ISCT1 alignment work better.
  • 1451 Issues with POP is making this H1 alignment work tough; Sheila is now taking H1's IMC to OFFLINE
  • 1511 Going on floor to see if sidebands are on.  (they were not, so Sheila turned them ON)
• 1433 EX Wind Fence (mitch.randy)
• 1533 LVEA cleaning (kim, nellie)
  • 1606 kim out, 1615 nellie out
• 1622 isct1 table alignment continued (sheila,tj)
  • Stop when EQ arrived
  • 1830 Return to alignment work (sheila, tj)
• 1706-1732 H2 room (kim,nellie)
• 1734 EQ trips several ISIs
• 1952 Setting up camera to monitor new HAM1 pump. After getting the go-ahead with Gerardo. (dave)
• 2010-2320 Continuing ISCT1 alignment (sheila, camilla)
• 2035 TCS Chassis being toggled on/off (tj)
• 2115-2147 Tour in Control Room (ibrahim)

TITLE: 05/23 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 4mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY:

IFO is in ENGINEERING and aligning

Now with all chambers vented, we are aligning cavities with the following done today and yesterday:

• ALS
• PRX
• Beatnotes
• Input
• Mich

Continuing to align cavities until we can make it through an initial alignment (and if the stars align too, potential full IFO locking)

Camilla, TJ

I went to turn on the CO2 lasers to prep for locking today. I found both power supplies on the mechanical room mezzanine needed to have their outputs turned on. For TCSX, I then was able to turn the controller on, turn the key, hit the gate button, then turn on the laser via medm as usual. For TCSY though, the controller complained of a Flow Alarm as soon as the unit was turned on, and turning the key or hitting the gate would not clear it. The flow was reading 2.45gpm according to the paddle wheel flow meter on the floor, and before the vent we were just above 2.5gpm on the floor and 3.4gpm at the chiller. We had reduced the flow of this chiller back in December with Robert (alog81246), so I tried bumping up the flow slightly to 2.6gpm on the floor in the hopes to clear the flow alarm. Now, the flow alarm wasn't present when turning the unit on, but then when I turned the key and hit the gate button, the flow alarm came back.

At this point Camilla and I checked cable connections, tried turning the chassis off and on while waiting a bit, patting our heads while rubbing our bellies, and some other non-fruitful things. Eventually we moved the flow back up to 3.8gpm at the chiller and 2.8gpm at the floor and the flow alarm never showed up. We tried to bring the flow down a bit, but the flow alarm would return. We have no idea why the controller isn't happy with us running the flow at levels that we have been for all of 2025. For now, sorry Crab Nebula.

Richard, Jonathan, Erik, Dave:

To help the vacuum team remotey monitor HAM1's ion pump controller over the weekend pump-down, I have set up a temporary web cam, attached to a ladder and positioned close to the Varian front panel. This is a fish-eye camera, originally in the MSR and called msrcam. The camera is connected via POE ethernet to the Mech Room VAC rack ethernet switch (port 13 of sw-mech-aux , 106 VLAN). The POE injector is on the top of the rack.

Erik created a virtual FOM on cdsws12 display 5, which captures a chromium browser viewing the camera. This image updates every minute.

For timestamping, I've borrowed a wall clock from the OSB.

FOM_image

This is for FAMIS #26416.
Laser Status:
    NPRO output power is 1.842W
    AMP1 output power is 70.19W
    AMP2 output power is 140.3W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 4 days, 6 hr 50 minutes
    Reflected power = 23.09W
    Transmitted power = 105.5W
    PowerSum = 128.6W

FSS:
    It has been locked for 0 days 0 hr and 14 min
    TPD[V] = 0.82V

ISS:
    The diffracted power is around 3.9%
    Last saturation event was 0 days 3 hours and 31 minutes ago

Possible Issues:
    PMC reflected power is high

On May 15, 2025, "close-out" photos were taken of everything on the new HAM1 SEI ISI Optics Table a few days before HAM1 was sealted up & pumped down.  Took almost 300 photos/videos (~66Gb)!  These photos/videos have been uploaded to this google drive location:

https://drive.google.com/drive/folders/1w4GwB5H2c7Dgw37FxRgLK0ganJ1nycxs?usp=sharing

Notes:

• Cameras Used:  Canon 60D & iPhone13
• Types Of Photos:  Took a variety of photos (various wide angles, and then close-up Top Views of most of the optical components).
• Photo Names/Info:  To help give information for each photo, renamed each photo with info of the image
  • For names of optical components I used a few documents:  
    • Layout drawing D1000313---specifically looking at the Added File of Camilla's Cartoon image which has all components labeled.
    • Also used Camilla's google document, G2501073.
  • Photos are numbered and sorted in a way which makes sense (i.e. all wide shots are listed fiirst, next are top views from the west side of HAM1, top views from the east side, and then masses.
• Orientation:  Top view photos are oriented so the west side on the "top" (similar to the layout drawings mentioned above).
• "Before" Photos:  For comparison, "before" photos from April 7th are in this photo folder (posted in alog #83790)

Fri May 23 10:19:34 2025 INFO: Fill completed in 19min 30secs

TITLE: 05/23 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 1mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY:

Sheila is sorting through the state of alignment which will then lead to continuing ISCT1 alignment work out on the floor.  Mitch and Randy are at EX starting on the wind fence.

Janos

Today morning the pressure in HAM1 rose quite quickly to ~1E-3 Torr. As I was driving to the site, Richard found out that the new Agilent leak checker, which backed the turbo, stopped. So he valved out the turbo via its main gate valve.
After arrival, I valved out the leak checker, valved in the Supersucker cart's Anest Iwata ISP500 pump, and restarted the turbo, then valved it back again. The pressure very quickly dropped to ~7E-6 Torr (roughly where it was before the incident). Since then, everything is nominal.

In the afternoon around 3 pm I valved in IP13 (500 l/s Starcell) to HAM1. The pressure nicely dropped to the low E-6s, however, it started growing. I checked the controller in the MER, and found that it is unable to hold the usual -7000 Volts, in fact, it was around -3000 Volts, and dropping (towards 0). Moreover, I found that the controller's comm cable is not wired properly to CDS, its channel reads IP1/B ion pump. So I valved out the Ion-pump.
With Dave, Fil, Richard, and Patrick we looked into the problem, and we quickly found that the Ion-pump's comm cable physically was not wired in at all.
I quickly plugged the valved out Ion-pump to an IPC mini, which obviously hardly could hold the pressure, but the voltage still slowly converged to -7000 V. After this, I located a spare controller (brand new, identical to the one we used), also attached a bypass connector to the comm outlet, and plugged the Ion pump to this one. It quickly reached the nominal -7000 Volts. (See the new (left) and old, broken down (right) controller on the IP-controller rack in the MER).
Early next week, after (hopefully) a successful leak check on HAM1, the Ion-pump will be valved in permanently. The comm cable wiring will also be finalized later.

TITLE: 05/22 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Another busy day! After some pumpdown troubleshooting this morning, ISCT1 was rolled back into place, its bellows were attached, and beam alignment on the table is ongoing. Cycled ISC_LOCK through DOWN and SDF_REVERT, but ran into an issue where ETM ESD chassis needed to be restarted after the power outage last night. I also ran a quick rotation stage calibration.

• Sensor correction is ON
• All chambers are back to their nominal configurations except HAM1, which still needs work done on the ISI's isolation loops
• IMC is LOCKED with 2.2W input (rotation stage still needs to be calibrated)
• ISC_LOCK in READY

LOG:

After ISCT1 alignment worked wrapped up for the day, I ran a calibration sweep of the PSL rotation stage following the steps outlined in alog79596.

The measurement file, new calibration fit, and screenshot of newly accepted SDFs are attached.

TITLE: 05/22 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: 11mph Gusts, 6mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY: HAM1 pumping continued overnight, but starting about 1.5 hours ago the pressure started rapidly climbing. No cause determined as of yet. VAC team has been contacted.

EDIT: Had the wrong channel trended, corrected in current attachment.