Tue Jan 13 10:09:38 2026 INFO: Fill completed in 9min 34secs

TITLE: 01/14 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Another busy day of upgrades; JAC installation and HAM7 beam alignment continued while the move/upgrade of BS DACs began today and should wrap up tomorrow morning. Jim also discovered a failed power supply at EX which looks to be the reason the chamber can't be recovered, so he and Marc are starting to take action there.
LOG:                                                                                                                                           

Sheila, Kar Meng, Elenna, Jim

Yesterday Jim and I went to the chamber in the morning to work on cables. We got a solution for the cables after some work, but one peek zip tie luanched itself across the chamber.  We spent a few hours searching for this; I climbed into the chamber on the -X side and could them see it on the bottom of the +Y door where Jim was able to reach through the port and retreive it.  

In the afternoon Kar Meng and I went back to the chamber and found that the beam was blocked on the cable clamp that Jim and I had added earlier.  The previous cable routing is shown here, the peek cable clamp is on the bottom of the pillar so that it doesn't block the beam.  We removed the new alumium clamp and I tried to move it lower, the second from the top bolt hole is not the right size so we need to place this in the 3rd from the top hole.  I found that difficult to reach and eventually decided to leave it for another day or ask for help from someone with longer reach.  

After this we saw that our beam did arrive on AS_C in HAM6 but wasn't aligned onto AS_A or AS_B.  

This morning Elenna, Kar Meng and I went to the chamber to see if we could improve the alignment.  We walked B:M3 to align onto the second iris on SQZT7, and B:M4 to align onto the iris in front of ZM4, which seems degenerate with the iris at the bottom of the SQZT7 periscope.  This worked well and we could see light on AS_B and AS_C although nothing on AS_A.  We then went to the control room and moved ZM6 to center on AS_C better, then we could engage the AS centering loops.  

This afternoon Kar Meng and I had another look at alignment from the control room.  We have set the OMs back to their alignments during the run, and we still have the beams on AS_C, AS_A and AS_B although we are using a lot of the range on ZM6.  

Still to do before finishing in HAM7:

• adjust alignment to relieve range on ZM6
• add cable clamp on bottom of OPOsus pillar near B:M4, without blocking beam
• Photos of cables as we are leaving them
• unlock VIP
• photos of iris locations and beams on them
• power budget measurements:  with power meter at various points on VIP, seed reflected power and seed power to homodyne path
• realign beam onto FC QPDs 
• check alignment onto other photodiodes in chamber
• remove irises
• unlock ISI, SUS and ISI checks

Masayuki, Jennie, Rahul

Given below are the list of lenses and mirrors I have placed on the ISI table and roughly positioned (without the beam for now) them as per following drawings  - D2500344 and D0901821.

Lenses - L1, L2 and L3: Masayuki confirmed from the vendor that the arrow mark on the lens point towards the convex side. For lens L1, arrow is pointing against the PEEK ring (in the lens holder). For Lens L2 and L3 the arrow is pointing towards the PEEK ring. The PEEK ring for all three lens are facing towards the HAM2 chamber. In other words, curved surface of L1 is facing towards the PSL and for L2-3 towards HAM2.

I re-cleaned L1 lens after finding some dust particles on the curved surface, post cleaning the lens looked better.

Reflecting mirrors - JAC-RM1, JAC-RM2, JM2 and M3.

Masayuki and I also added a temporary Siskyou mount acting as JM3 (for Tip Tilt, just like JM1). We will replace both of them with the Tip Tilt next week.

Next, we proceed with aligning/pointing the above optics with the beam. L1 and JM2 are already decently pointing (although without a locked JAC) towards JM3.

J. Kissel
ECR E2500296, E2400409
WP 12962

D2300401 (for susb13) and D2300383 (for susb2h34)

We begin the major upgrade of the H1SUSB123 and H1SUSH34 SUS and SEI Systems converting them to SUSB13 and SUSH34 a la G2301306 today. We're focusing on upgrading the DACs in the IO chassis () and all the downstream surrounding impact of that  analog electronics This will take down the following computers, and they will be resurrected with new names as follows:
    FORMER NAME           FORMER SUS              NEW NAME           NEW SUS
    h1susb123             ITMX, ITMY, BS          h1susb13           ITMX, ITMY
    h1sush34              MC2, PR2, SR2           h1susb2h34         BS, MC2, PR2, SR2, LO1, LO2
    h1susauxb123          ITMX, ITMY, BS          h1susauxb13        ITMX, ITMY
    h1susauxh34           MC2, PR2, SR2           h1susauxb2h34      BS, MC2, PR2, SR2, LO1, LO2

As such, I've 
    - brought the ITMX, ITMY, BS, HAM3, and HAM4 SEI systems to ISI_DAMPED_HEPI_OFFLINE (so we don't risk any "hard" trips of HEPI during all this).
    - brought all impacted SUS gaurdians to AUTO mode, then to the SAFE state
    - Increased the bypass time on all impacted software watchdogs to bypass time to a large number (90000000 secs), and hit BYPASS

TITLE: 01/13 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.49 μm/s 
QUICK SUMMARY: CDS upgrades this morning; moving SUS in BSC2 over into the sush34 model and upgrading to LIGO DACs. JAC installation and HAM7 beam alignment will continue as well today.

Workstations were updated and rebooted.  OS packages were updated.  Conda packages were not updated.

Daniel, Ryan S, Erik, Jonathan, Dave

In preparation to tomorrow's work on h1susauxb123 we decided to move the EDC from here to h1susauxh56. We did this at the same time the DAQ was being restarted for:

1 Daniel's new h1lsc model

2 Adding Ryan's JAC_LOCK guardian node to EDC

The EDC move had a few configuration issues which were quickly resolved. There were no issues with the h1lsc restart.

TITLE: 01/13 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Laser safe in the LVEA this morning for some craning and cabling, both in-chamber and out, but now back to laser HAZARD for more JAC installation and SQZ beam alignment this afternoon.
LOG:

(Travis, Dave, Gerardo)

Dave noted and reported a rise on vacuum pressure at X-End.  Since, Travis and I were in the control room, we quickly determined that the controller for X2-8 ion pump was not working.  I drove down and found the high voltage disabled/off at the controller, and on on the screen the following note:"An excessive arcing condition has been detected (Error10)".  No guidance found on manual, snapped a photo to submit later to vendor.  I restarted the system and the HV started, controller hummed and crackled and was only able to get up to 600 Volts, all while making noise, and one point some funny smell came out of the inside of the controller, HV was disabled, time to replace the unit.

Closes FAMIS#27662, previous check in alog84918. No new issues with any dust monitors.

**PSL Anteroom and Laser Room will be done at a later date when going in there is required for other tasks by Ryan Short.**

For the CS dust monitors.

LVEA: 

HAM1 / LVEA5: On the +Y side of the HAM1 CR. Passed the zero count on the first round, and the flow was 2.8. PASS

HAM1: An additional spare DM on the -Y side of the HAM1 CR. Passed the zero count on the first round, the flow was a bit high at 3.0 so I adjusted it down to 2.8. PASS

HAM7 / LVEA6: Passed the zero count on the first round, and the flow was 2.8. PASS

Biergarten / LVEA10: Passed the zero count on the first round, and the flow was 2.8. PASS

DR: This DM was frozen when I got to it. Passed the zero count on the second round (first round had 2 cts of 0.3 um), and the flow was 2.8. PASS

Optics Lab: Passed the zero count on the first round, and the flow was 2.8. PASS

VPW: Passed the zero count on the second round (first round had 1 ct of 0.3 um), and the flow was 2.8. PASS

CER:

All the old grey HHPC handheld dust monitors in various states of degradation, none of them can take a full sample on power or battery without dying. I've removed the last one of this model I found in the CER and added it to collection of the other broken ones.

I tested the last spare GT521s left in the CER as well which I had borrowed from the FCES (s/n R16420). It passed the zero count test on the 2nd round (first round had 1 ct of 0.3 um) and the flow is 2.8. PASS

For the OUT building dust monitors.

EY: Passed the zero count on the second round (first round had 1 cts of 0.3 um), and the flow was 2.8. PASS

EX: Passed the zero count on the second round (first round had 1 cts of 0.3 um), the flow was a little low 2.65 so I went to adjust the pump in the mechanical room. These new vacuum pumps' adjustment knob seem touchier than the old one. It was at 19.5 inHg, I adjusted it up to 20 but it would stay at 20, it kept slowing increasing in pressure. I watched it slowly build up to almost 22 after I adjusted it up slightly to 20. I ended up bringing it back down to as close as I could get to where it was. I ended up around 19.8 inHg which brought the DM flow back to a little over 2.7, within the 5% margin of error. PASS

Mon Jan 12 10:05:34 2026 INFO: Fill completed in 5min 30secs

TITLE: 01/12 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 8mph Gusts, 4mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.59 μm/s 
QUICK SUMMARY: JAC install and HAM7 alignment will continue today after craning finishes in the LVEA and it's transitioned back to laser hazard.

[Tagging SEI] The ETMX CPS glitched over the weekend, tripping both stages of the ISI, and I am unable to reset it without it tripping again immediately. Since ETMX isn't crucial for planned work today, I'll wait until Jim gets in and consult with him.

Regularly scheduled fill at 10:00 did not run because both thermocouples were above the +30C nominal max limit [31C, 34C] presumably due to icing around the TC and/or Ref Junction.

Sun Jan 11 10:00:00 2026 ALARM: Abort run, Both Thermocouples BAD

I made a temporary change to the configuration to increase the nonimal TC-MAX to +40C and scheduled at 10:50 run.

Sun Jan 11 10:58:34 2026 INFO: Fill completed in 8min 30secs

This appears to be a good fill. The settings will be restored to nominal for tomorrow's fill.

[Jason, Jennie, Betsy, Keita, Sophie, Masayuki]

Initial alignment (1/8)

• For the initial JAC alignment, we need to scan with laser frequency since we didn't have JAC PZT actuation. The laser frequency was swept by changing the laser crystal temperature from −0.13 K to −0.05 K with a period of 30 seconds.

• The alignment was adjusted to suppress higher-order modes resonance. The actuators used were the PSL PZT and the fixed Siskiyou-mounted mirror that replaced the JM1 tip-tilt suspension. I worked inside the chamber while Jason controlled the PSL PZT via MEDM. Beam walking was performed by moving the PSL PZT first and optimizing alignment with the other mirror in the chamber. Note that due to the HAM1 periscope rotating the beam axis by 90 degrees, the pitch and yaw of the PSL PZT are effectively swapped in the JAC coordinate basis.

• As a result, moving the PSL PZT by approximately 1000 counts in pitch (corresponding to yaw in the JAC basis) achieved an alignment good enough to observe the TEM_{00} mode. Further alignment will be performed using the transmission PD signal.

JAC wiring (1/8)

• After discussion, we decided to delay installation of the reflection path. Since PDH locking using the reflection RF PD was therefore unavailable, we proceeded to align the TRANS DC PD and aim for shoulder locking using this signal.

• In the nominal design, the TRANS PD receives light from the JAC leak port (~0.3% of the input power), picked off by a laser window with 0.7% reflectivity. However, with the current PSL power of ~100 mW, the available light was insufficient. Therefore, the TRANS PD was configured to directly receive light from the leak port without a laser window.

• Due to a mistake, a post that was 0.5″ too short was prepared for the DC PD mount, and no suitable replacement was readily available. As a temporary configuration, the PD was mounted in a base–dog clamp–post–dog clamp–PD stack, using a 0.25″-thick dog clamp as a spacer.

• In-vacuum cables were also wired. From the feedthrough (D4F10), a DB25 cable (D2500336) splits into three branches: TRANS PD, PZT & thermistor, and heater & thermistor. Since the ALS beam runs adjacent to the JAC, cable routing clamps were used to avoid interference with the ALS beam (see attached photos).

Wiring confirmation (1/9)

• To enable locking using the TRANS PD, we confirmed that the corresponding signal path exists in the CDS infrastructure added by Daniel. In the H1LSC model, ADC2 channel 10 is assigned to the DC PD and routed through the dither locking module to the JAC PZT output.

• In the analog path, the DCPD output from the JAC interface chassis is connected to the auxiliary PD concentrator, and its monitor port is routed to the DAC via the D-sub patch panel. Both the fast and slow channels were confirmed to be correctly connected using the actual PD signal.

• The polarity of the PZT wiring was verified. For this test, the DB9 connector of the PZT & thermistor cable (D2500336) on the JAC side was disconnected, and gold pins were inserted into pins 5 and 9 of the feedthrough-side female connector (the PZT inputs). A 100-count offset was applied to the JAC_SERVO filter bank output driving the PZT, and the voltage between pins 5 and 9 was measured with a multimeter. To avoid high voltage during this test, the HV amplifier was powered by an 18 V supply instead of the nominal HV source.

• Toggling the 100-count offset resulted in −10 V (off) and +9 V (on). The same behavior was observed when measuring the PZT driver output directly, confirming correct cable connections and no risk of reverse loading the PZT.

• These voltage levels were not considered reasonable for normal operation, so Daniel was consulted. The likely explanation was operation with the 18 V supply instead of the HV source. After reconnecting the HV supply, injecting the laser into the JAC, and applying a ramp signal to the PZT, motion of the PZT was clearly observed in the transmission signal.

• The TRANS PD was re-aligned, and the signal observed on MEDM was maximized.

• The thermistor connection was also verified, yielding a reasonable reading of approximately 22 °C. Heater testing has not yet been performed, but functionality of the PZT, thermistor, and PD has now been confirmed.

Optics preparation (1/9)

• In parallel with wiring checks, preparation of the optics on the JAC output side was carried out.

• An issue was found with a newly fabricated ISC post (8-32 variant) intended for the lens mounts; it was confirmed that the standard D1000968 post works without issue. Keita and Sheila located suitable posts in the staging building, and three lens mounts were assembled using these posts.

• Attempts to peel the First Contact from the lenses were unsuccessful, as the FC layer was extremely difficult to remove, and we gave up. Applying FC to spare optics is considered the fastest path forward, and for the stuck FC, reapplying FC to soften it may be necessary.

• HR mirror preparation was also performed.

• Further details of the optics preparation will be posted shortly by Keita.

[Jason, Rahul, Jennie, Betsy, Masayuki]

Summary

JM1 was swapped from a tip-tilt suspension to a fixed Siskiyou mount to improve beam stability for alignment, profiling, and JAC control. Mode matching to the JAC was measured using a beam profiler, yielding <1.5% mismatch in both axes, well within the current requirement. The JAC pedestal and body were installed in HAM1, and initial beam injection showed clear HoM resonances at the transmission port. One discrepancy in body mode damper mounting holes was identified and will be tracked via FRS.

Details

• After discussion, we decided to replace the JM1 tip-tilt suspension with a fixed Siskiyou mirror mount. This provides easier alignment, beam profiling, and more stable JAC control compared to using a suspended mirror. As reported in the previous alog, JM1 had already been aligned to the target irises with a good angle, so the position of the JM1 suspension was marked with dog clamps to allow easy recovery of the alignment after installation work. The Siskiyou mount was aligned using the same target irises.

• After switching the mirror mount, a beam profiler was set up in the reflected beam path from the fixed JM1 to measure mode matching to the JAC, as shown in the attached picture. The z-origin was defined at the position where the beam profiler cart reading was set at 16 cm along the rail. Due to cable length limitations, beam size measurements near the waist were not possible, but this was not considered a significant issue.

• The measurement results are shown in the attached plot. The target and measured beam parameters are:

  • w0_target = 548.00 µm, z0_target = −4.318e−01 m

  • w0_x = 572.01 µm, z0_x = −5.277649e−01 m

  • w0_y = 603.50 µm, z0_y = −3.736913e−01 m

• The resulting mode mismatch was 1.363% (x) and 1.455% (y). Our current target for mode mismatch is 10%, which is sufficient for achieving a reasonable JAC lock. Therefore, this result is excellent and no further adjustment is required at this stage. Fine tuning may be performed later after JAC lock, possibly after HAM1 pump-down.

• The JAC pedestal was installed and secured to the table, and the shim was placed on the pedestal.

• The JAC body was then brought into the chamber. The procedure was recorded on video. A handle (not Class-B cleaned) was temporarily attached to the JAC; it was wiped down, and aluminum foil was inserted between the handle and the JAC body. During installation, Jason and Rahul supported the body from the sides while I handled the lift into HAM1. The end caps protecting the mirrors remained installed throughout this process.

• During installation of the body mode dampers, we found that one of the screw holes specified in the drawings was missing. The location of the missing hole is shown in the attached picture. As a result, one body mode damper was shifted by one column of screw holes (a 2″ offset). We discussed this with Stephen and believe it should not cause an issue, although it will be monitored. An FRS ticket will be submitted to track this discrepancy.

• After removing the end caps, the beam was injected into the JAC for a quick alignment check. A higher-order mode (HoM) resonance was immediately observed at the transmission port, confirming successful initial alignment. The next steps are fine alignment of the input and reflected beams, followed by in-vacuum wiring.