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.

Sat Jan 10 10:09:50 2026 INFO: Fill completed in 9min 47secs

[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.

TITLE: 01/10 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: More JAC installation and HAM7 beam alignment today. The LVEA is now Laser SAFE in preparation for craning on Monday morning.
LOG:

Kar Meng, Sheila

Today we shifted the beam in SFI2 to be more centered on the second polarizer, to hopefully get rid of our scattered light shelf, and aligned the beam coming off the VIP to an iris in front of ZM4 and two irises on SQZT7, by moving B:M3 and B:M4.  After this we let the beam through the viewport into HAM5.  We see some light on AS_C, AS_A and AS_B, but it is not well aligned onto those diodes and we had trouble engaging the AS centering loops.  

Since we shifted the beam in SFI2 we have misaligned it onto the FC QPDs, we can see this beam is now clipped on the lens D:L1.  We were able to realign onto this my moving B:M3, but this misaligned the beam in the main path irises. 

Daniel, Ryan S, Dave:

h1lsc: We installed Daniel's latest model, a DAQ restart was required.

Slow controls: Daniel's latest INI files were added to the DAQ, an EDC restart was required.

h1ascimc: Daniel found some ADC discrepancies, I fixed them at the top level of the h1ascimc model. No DAQ restart was required.

Following the restarts of the h1lsc and h1ascimc models, the DAQ+EDC were restarted in the order: 1-leg, EDC, 0-leg. There were no problems with these restarts.

FAMIS 38864

Looks like at the power outage on December 4th there was either a significant drop in pressure at pump station 1 or a setting was lost that changed the readout. A jump is also seen at that time in the output voltage. Otherwise, trends look steady.

FAMIS 27706

Laser Status:
    NPRO output power is 1.83W
    AMP1 output power is 70.47W
    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 0 days, 23 hr 31 minutes
    Reflected power = 26.88W
    Transmitted power = 104.5W
    PowerSum = 131.4W

FSS:
    It has been locked for 0 days 23 hr and 30 min
    TPD[V] = 0.4004V

ISS:
    The diffracted power is around 4.0%
    Last saturation event was 0 days 0 hours and 0 minutes ago

Possible Issues:
    PMC reflected power is high

Closes : Famis 27647 Using Vibration Sensors To Gauge Health Of HVAC Fans. 

Vibrometers look fine and don't seem to be abnormally performing yet. 
 

Fri Jan 09 10:07:59 2026 INFO: Fill completed in 7min 55secs

TITLE: 01/09 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: 3mph Gusts, 2mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.42 μm/s 
QUICK SUMMARY: JAC install and SQZ alignment work slated for today, although probably a quieter day ahead.

TITLE: 01/09 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
DAQ restart at 23:46 UTC

Mostly JAC & SQZer work was done today.
Fil did put hook up the HV for JAC use.
Light pipe is should and has been double checked to actually be shut.

LOG:

Daniel, Erik, Jonathan, Dave:

we installed Daniel's modifed h1lsc model. This required a DAQ restart.

DAQ 1leg was restarted at 15:47, followed by the 0leg at 15:52.

FAMIS 27733

pH of PSL chiller water was measured to be between 10.0 and 10.5 according to the color of the test strip.

Thu Jan 08 10:02:56 2026 INFO: Fill completed in 2min 54secs

[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.

[Jennie, Jason, Rahul, Betsy, Masayuki]

Betsy monitored the particle count throughout the work, and it remained below 20 at all times.

Summary:

The input periscope was installed and aligned. Minor First Contact issues on the top mirror required a mirror swap with the output periscope, after which installation proceeded smoothly. The periscope height and rotation were adjusted to center the beam on both mirrors and meet the 90° ± 5° rotation requirement with sufficient margin. JM1 was subsequently installed using target irises.

Work Details

• Aligned the beam to the HAM1 irises. The bottom mirror of the periscope was used to align the first iris, and the top mirror was used for the second iris. Initially, the beam was hitting the left edge of the iris; after several iterations of beam walking, both irises were well aligned.

• During removal of the first First Contact (FC) on the top mirror of the periscope, we found a small piece of FC residue remaining on the mirror surface. We attempted to remove it by scrubbing, but it could not be removed. Therefore, we decided to reapply FC to this mirror. The periscope was removed from the chamber and placed on a clean tray. Jennie and Betsy applied FC to the HR surface of the top mirror. The second FC attempt was also unsuccessful, so to continue the work without waiting for FC drying, we decided to swap this mirror with the top mirror from the output periscope, which will be installed later. The mirror taken from the output periscope was successfully cleaned, and the FC peeled off properly.

• At the time of the first FC attempt, the target irises for periscope alignment were placed. The first picture shows the two target irises. Each iris was aligned to the corresponding hole line. I measured the distance from the hole line as shown in the second and third pictures. The iris was placed approximately three-quarters of the way from the hole line. (In one of the pictures, the hole is difficult to see, but it is located beneath the 4-inch tick mark on the ruler.) Before placing these irises in the HAM1, the height was also adjsuted with rulere to 4".

• After positioning the periscope at its nominal designed location, we found that adjustment of the top mirror height was required. The periscope includes a vertical slot to accommodate different beam heights from the PSL at the two sites. The top mirror was moved to the highest position within the slot, which provided the best alignment for the beam to hit the center of both mirrors.

• The output beam from the periscope was aligned by translating and rotating the periscope body itself. The rotation angle needed to be 90 degrees within a tolerance of ±5 degrees. As discussed below, this requirement was satisfied with margin.

• The top mirror of the output periscope was also hung in the same manner as the input periscope, providing an appropriate output beam height.

• After completing the periscope installation, JM1 was installed. Target irises were again used for alignment, and JM1 was positioned using these references. Details of this installation will be reported separately by Rahul.

Rotation angle discussion

• The beam line from the PSL was projected onto the ISI table by measuring the iris positions that were placed at the beginning of this installation period (see earlier alog). The first iris (closer to the PSL) was positioned 1-3/8″ from the −Y hole line, while the second iris was 1-5/16″ from the same reference. The two irises are separated by approximately 48″, indicating that the beam has an angle toward the −Y direction of (1/16) / 48 = 0.0013 rad.

• The beam from the periscope was aligned using two irises separated by 20″. Assuming the irises are parallel to the hole line and that the alignment accuracy is limited by the iris aperture size (~1 mm), the beam is parallel to the hole line within 1mm / 20″ = 0.0019 rad

• Combining these effects, the total error of the rotation angle of the beam about the z-axis is less than 5 mrad even in the worst-case scenario. The requirement for this rotation angle is 90 degrees ± 5 degrees (±87 mrad), so the alignment meets the requirement with a safety margin of approximately a factor of 10.