The chiller systems at the mid stations were started this morning for the season. 

Tue May 27 10:09:04 2025 INFO: Fill completed in 9min 0secs

Attached is the analysis of the TDR and delay measurements for the REFL and POP RF sensors.

The 2 columns labeled "phase TDR" and "correction phase" are the calculated phase shifts from the TDR and phase measurements, respectively. A longer cable between the RF sensor and the demodulator will make this phase shift more negative (modulo 360°).

If I got the signs correct, this number needs to be subtracted from the current phase shift values. This is indicate in the highlighted column labeled "new Phase". If not, one can try the column "wrong Phase".

Matt, Camilla, Sheila

Once the X and Y green arms were locked, Matt and I measured their powers on ISCT1, straight after the prism.  Sheila took H1:ALS-{X,Y}_REFL_LOCK_TRANSPDNORMTHRESH from 0.8 to 0 so that we the arms would stay locked while we blocked the beams. Measured:

• 1.25mW on ALSX
• 1.75mW on ALSY

TITLE: 05/27 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Tony
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 6mph Gusts, 4mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY:
The goal is to start locking and follow the steps outlined in the commissioning document https://docs.google.com/document/d/1P6JXVV_bhdN2M5k2PLoa0tu-AmY-PiC98zZ0nzBIJ2I/edit?tab=t.0
H1 Is currently going through a manual Initial alignment " Without Green Cameras".

 

We are down to two temporary EPICS IOCs running on opslogin0 which need to be restarted following reboot of opslogin0:

digivideo_dummy_ioc: We moved some critical cameras to the new server, but found that they needed image masking so they were returned to h1digivideo2, but the DAQ is expecting the new server's channels. This IOC provides the missing channels.

vac_ham1_pressure_converter_ioc: The Beckhoff calibration for HAM1 pressure is off by two orders of magnitude, this IOC creates a H1 HAM1 Torr channel, calculating the pressure from the gauge's raw voltage reading.

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

Mon May 26 10:11:15 2025 INFO: Fill completed in 11min 11secs

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