Jim, Shoshana, Alexandra, Arnaud

Today we continued setting up the H2-PSL lab to start the testing the HOQIs.

* Received and moved the laser system (RIO+Laser Driver+TEC), and readout (HOQI TIA) in the H2-PSL (see picture 1) 
* Gathered needed electronics from the EE shop (See list below) and plugged them in the lab
* Bagged and tagged the peek HOQI components from VPW (waveplate holders, photodiode holders, in-vac cables)
* Visually inspected the new batch of 10 flexures after c&b (see picture 2), and brought them to the H2-PSL (no issues found so far)
* Started setting up the Panasonic optical readout for CRS balancing. We will need some basic components from the optics lab to hold this readout.

Items borrowed from the EE shop :

x2 GWINSTEK power supply
x1 Hewlett P power supply
x1 multimeter with probes
x1 Techtonik oscilloscope 
x1 Bnc banana plug
x4 bnc to clips
x4 bnc cables
x1 db9 cable
x3 power cables
x3 breakout boards (x2 db9 and x1 db25)
x3 db9 gender changers

As per WP 13286 I tested the copy of the fmcs epics ioc that I had extracted from fmcs-epics-cds.  Unfortunately the IOC would crash each time I ran it.  There was not time to debug and see if it could be fixed today.  So the mac mini is still running the ioc.

Sheila, Camilla, Disha

After Jim locked the ISI, Marc bypassed the high voltage interlock, and Camilla restored the psams, we reset the alignment sliders following 90483 which was in air.   The dither locking worked without any issue, and we saw that the beam was low on both the irises in the homodyne path on SQZT7.  Camilla adjusted the alignments of ZM4+ZM5 to center the beam on the irses, screenshot attached shows the alignment that she found.  

We placed an iris in front of ZM4 for this alignment, we were able to look from the +X side of the chamber to check the centering.  We also took photos of the IR/green co-alignment, it looks good coming right off the VIP, but looking right after ZM3 you can see that there is a small misalignment in yaw.  We will continue with placing irses tomorow.  

Betsy, Anamaria

With the helpful kits Mitchell had prepared, we assembled the cage baffle brackets and panels on a table by BSC1; this includes CP and HR cage baffles. We chose SN 3's for ITMY and SN 4's for ITMX for both panels and brackets. We also checked that we have the various tools we need chamber side. Still need to make one more set of brackets for ITMX CP baffle, but that can wait. We found and staged two ACB long lockers but only one wedge. 

TITLE: 06/01 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Very busy day with lots of visitors on site! Essentially everything was recovered following the weekend power outage, doors on HAM7 were removed and SQZ work in the chamber started after the ISI was locked, QOSEM work continued on the BBSS, the ISI was balanced on the test stand, prep began for the ITM cage baffle installation, GV7 was cycled and left closed for venting of the X-manifold, more beam alignment went on in HAMs 2 and 3, turbopumps at EY and MY were tested, FARO surveying began in HAM3, CRS building continued, and SPI work in the optics lab is ongoing. The EDC is still showing several disconnected channels, some of which relate to EY dust monitors.
LOG:

[Jonathon, Ollie, Erik v., Tom]

h1susbs front end model was shut down and h1suslo12 was rebuilt and restarted, moving control of mc2 form h1susbs to h1suslo12.

This required DAQ and EDCU restarts.  The DAQ restart ran into problems because some channes were renamed (temporarily, hopefully) from BS to BBSS that were part of the GDS broadcast.  These channels have been renamed in the broadcaster lists for h1daqgds0 and g1daqgds1.

JAC PZT HV was off -> Mark reset the interlock.

JAC heater chassis was off -> I switched it on at the rack.

JAC error signal was not crossing zero -> I updated the dark offset H1:JAC-REFL_A_RF43_I_OFFSET to a new number 2.4.

Beckhoff was reporting "invalid value" error for JAC PZT whitening -> Patrick did something to clear that.

Rahul restored slider numbers for JM1/3, IMC1/2/3, IM1/2/3/4 and PRM to Friday evening numbers as he reported in alog 90419.

JAC guardian didn't want to lock because H1:JAC-TRANS_A_DC_NORMALIZED kept getting below the threshold of 0.5. -> I temporarily changed it to 0.1.

JAC PZT voltage was drifting quickly for 30 minutes or so and JAC kept unlocking (probably because JAC was heating up) -> waited for a while.

JAC still didn't want to keep lock for a long time. -> I put it to DOWN state, followed the resonance manually using the PZT voltage for a minute or so, changed the state to LOCKED and the guardian liked that.

Jenne refined the JAC alignment using PZT and JM1. H1:JAC-TRANS_A_LF_OUT_DQ momentarily went up to 620 and the best number in the past month before today was like 580. It's trending down in the past two hours, now it's ~580 and that's still a very good number.

Temperature drift is still going on, the symptom is that the PZT voltage drifts down to -10 Volts and at that point JAC unlocks, but the guardian relocks to higher voltage fringe position right away, and the drift is slow enough it's bearable. Last lock lasted for an hour.

Now we can set H1:JAC-TRANS_A_DC_NORMALIZED back to 0.5 if we want to.

Aligning beams onto QPDs while the IMC is flashing (eg, during a vent) is very challenging.  We want to know what the pit and yaw values are, but can only trust the values at a moment when there is a flash.

The jupyter notebook that has just been placed into git can (with lots of patient help from Jamie Rollins) read data that has been exported from an ndscope (so, can be data that is not DQ'd), and then will calculate the pitch and yaw values at the time of the largest flash in that time window.  

This is a direct link to the notebook right now for a snapshot of this first iteration, and you can see the plots at the very end and a printout of the pit/yaw values of all of the QPDs that I have collected data for.

Hopefully this will help make things a bit quicker as we work to center on our various ASC PDs and close out this vent.

I have restored the SUS alignment slider values (P/Y) for all the suspensions in HAM1, 2 and 3 chambers (i.e JM1, JM3, MC1, MC2,, IM1, IM2, IM3, IM4) which had changed after the Saturday site power outage. I trended the pitch and yaw slider values for all of the suspensions in these three chambers and restored the ones which I found have changed. I selected Friday evening (29 May 2026, 6.30 PM when Keita et al were done with moving the suspensions).

Marc and I turned on the HAM7 Hi Voltage Bypass in the Mech Rm Mezzanine. We first turned the PSAMS down to zero, they hadn't been zero'ed before Hi-voltage was turned off. WP13282

Belated alog from Friday.

Summary:

After realigning IMC and IM2 on Thursday, we continued aligning IM3 to put the beam in front of the PRM to the nominal position, IM4 to set the beam position in front of PR2, and PRM so the beam retroreflects. IM1 was left untouched, so the only change in IM1-IM2 line is from the change in the IMC alignment.

Clipping on IM4 baffle (HA12) disappeared completely. Beam position on IFI output baffle looked OK. Beam position on IFI input baffle didn't change (as expected) and still looked OK. There are some mystery 

We saw flashes on ASC REFL sensors but they were weak. We tried to center them using RMs but RM2 seems to rail in YAW.

What to do:

Scan PRM to make sure that we're NOT looking at some kind of ghost beam on ASC REFL sensors.

Assuming that we're looking at the real beam on REFL sensors, we can do either (or some of) these:

• Relieve RM2 by rotating RH9 (the fixed IFO refl pick off mirror in HAM2) by positive 500urad or so in YAW. This is the equivalent of the combination of negative 0.53 mrad for RM1 and negative 2mrad for RM2 in YAW. After doing this we can add 530urad to RM1 and 2000urad and continue centering from there. See attached cartoon (doesn't scale but the sign of things is correct) and the script.
• IM1 is almost degenerate as RH9 as far as relieving RM1 and RM2 is concerned, so we can rotate IM1 by negative 500urad or so in YAW. This requires that we tweak IM3, IM4 and PRM again but has an added benefit of moving the beam spot on the IFI input baffle closer to the center. See IM1rotation.png.
  • If you aren't sure how IM1 rotation is translated to the IFO refl beam,  IM1rotation_straightened.png is a simplified and unfolded version. The beam going out of IM1 goes through CWP at the IFI input (deflected but it's not written in the cartoon for simplicity), is retroreflected and comes back to CWP and defflected, the deflection for the REFL beam is depicted here. Without IM1 rotation the beam goes along the black path. With IM1 rotation (red path), the red refl beam converges with the black refl beam where the distance from the conversion point to the CWP is equal to that from the IM1 to CWP. The angle change of REFL is the same with the input and the lateral displacement of red refl relative to black is ~(distance(IM1_CWP)-distance(RH9_CWP))*angle_change.
• Make the OSEM coil driver output impedance smaller for RMs to gain more range. 1.2k to 500 Ohm should be safe. 

Both CO2X and CO2Y Chillers turned back on with no issue. Interestingly as the laser is off they are currently heating the water. 

All CDS systems have been recovered with the exception of EY dust monitor. The EY Comtrol serial-to-ethernet is not working, Erik is replacing its power supply.

Erik started the HWS code. At EX he powered up the h1cdsrfm expansion chassis and power cycled the BRS_EX. At EY he powered the expansion chassis.

We started h1cdsrfm which has cleared all the long-range-dolphin IPC errors. EY WAP just needed powering up via the Pulizzi.

Patrick started the code on the Beckhoff systems for CHILLER_CS, CHILLER_EX, BRS_EX, BRS_EY, NCALX and  MAINS_EX.

EDC is currently down to 16 disconnected channels, all EY_DUST.

J. Kissel"
As is all over the aLOG this morning, LHO had back-to-back site-wide power-outages this past Saturday 2025-05-30 -- LHO:90395. Here's the quick, pain-free record of recovering the SPI pathfinder's function to the levels we left it on Friday 2026-05-29 (LHO:90382). 

LASER
State of laser as I found it (entering the lab with laser safety googles ON):
    - Yellow chain and signage across the entry warning of "laser running unattended" still blocking entry. 
    - Magnetic lock of "outer" curtain released, manually hook-locked "inner" curtain still closed.
    - Laser hazard sign OFF
    - Laser STOP Button still "OUT" (in the ON position)
    - Laser Hazard sign still keyed "ON"
    - NPRO shuttered, still keyed ON, but not powered.

In short -- everything worked as expected in the event of a power outage if it happened while a laser system was running unattended.

    RECOVERY (all with laser safety glasses ON; obviously but just saying it "out loud"):
    - Unchained and stored "unattended laser" sign.
    - Pushed in ("OFF") laser stop button.
    - Keyed OFF laser hazard sign.
    - Pulled out ("ON") laser stop button to allow for re-energizing of interlock.
    - Keyed ON laser hazard sign.
    - Closed magnetic "outer" curtain and swiped in, laser hazard sign lit up as expected.
    - Confirmed NPRO laser output is shuttered. 
    - Looked at NPRO controller, red light ON under the OFF button (as expected because it was already/still keyed ON).
    - Plugged in and turned on PD100D interface for on-board S304C power monitor PD (installed within the laser conditioning/fiber collimating bread-board), confirming 1064 [nm] wavelength readout settings.
    - Waited ~2 minutes for the diodes' controllers to settle, then hit the green ON button
    - No issues with diode temp transients, laser worked just fine.
    - Unshuttered laser, and on-board S304C power monitor PD happily confirmed the expect ~198 [mW].

ELECTRONICS
State of electronics as I found it: 
    - Electronics +/-18 V and +/-24.0 V power supplies were ON, with their outputs producing voltage at their nominal settings.
    - Laser prep chassis and PD TIA chassis all showed happy green lights.
    - Keysight 33600A RF source had reset, with outputs off and all the wrong settings.

    RECOVERY (all with laser safety glasses ON; obviously but just saying it "out loud"):
    - Ran through T2600039 to restore all frequency settings
    - Exported March 2026 notes to LHO:90409 and restored CH1 (REF) and CH2 (MEAS) amplitude settings to -1.7 and -1.4 [dBm], respectively
    - Turned CH1 and CH2 output ON.
    
    Laser Prep Chassis SM05PD01A monitor PD ADC voltage: 7.83 [V].
    Laser Prep Chassis RF monitors M2 (REF) and M3 (MEAS) ADC voltage: ~750 and ~750 [mV]
    FBR_PWRIN_REF On-board power monitor PD ADC voltage: 4.68 [V].
    In short :: All these monitor ADC voltages are at normal values.

SPI IFOs
    No actions required after turning on LASER and ELECTRONICS.
    REF IFO Efficiency -- 4.96 V / (2 * 2.69V) = 0.922
    MEAS IFO Efficiency -- 3.00 V / (2*3.95 V) = 0.38

Recovered! 
Hopping back into The Mystery Machine...

Gerardo, Jordan, Camilla. 

On Thursday we assembled VAC sealing part of the CHETA VPs, D1700340-type02. The thinnest part of the optics are at 12o'clock if the VP is oriented with the P/N of D1700338 writing also ~12o'clock. 

D1700338-v2-001 with D1700339-v2-001 and D1700338-v2-003 with D1700339-v2-003. Both have optics D1100439-type02, which are DAR coated for 1064nm and 10.6um. 

Next steps is VAC testing, then first contact the window surfaces and add secondary window.

TITLE: 06/01 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: 7mph Gusts, 5mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.16 μm/s 
QUICK SUMMARY: Will continue recovery of various sytems following power outages over the weekend and will work on discovering what still needs attention.

Thankfully no more power outages following the second (14:27) outage Sat 30may2026. Here are the systems we left offline which will be restarted tomorrow, Mon 01jun2026.

PSL Diode Room Beckhoff Controls

Long range dolphin end station Adnaco expansion chassis (h1cdsrfm)

NCAL EX

BRS EX, EY

HWS EX, EY

MAINSMON EX

CHILLERMON EX, EY

J. Freed

For the build of SPI, I measured the expected power output from a dual source Keysight 33600A through SPI's 2W amp D2500004. These measurements were taken with a E4418A EPM power meter using the HP 8484A 30dB attenuator attachment. After analyzing the data it is hard to say that the power meter power readings were accurate but the power the AOMs are receiving should be below the damage threshold of 33dBm.

I measured the power at 2 points in the chain from Keysight -> 2W  -> SPI prep, for both channels. (SPI_Build_RF_Diagram.png) The first point is just before the 2W amp, and the second point is just before the SPI prep for both channels. Then I compared that with what the output monitor voltage was showing on SPI prep for both channels.

Power_Before_2W_Amp.png Is the data collected from power measurements just before the 2W amplifier. The limit of 22dBm is the limit of the keysight. From this it can be seen that there is not a 1-1 measurement between what the keysight says it is outputting and what the HP 8484A sensor is measuring. This difference is also changing based on the input power itself. With lower power overestimating what the keysight says its outputting, and higher power underestimating what the keysight says its outputting. This is a problem with the probe as switching out the probe to an E-series gives a relatively consistent error of -0.2dB between what the keysight says its outputting and what is being measured. Unfortunately the HP 8484A sensor is the only probe that can measure up to the 32-32.5dBm needed for SPI. Interpolating the results of the HP 8484A sensor up to 32 dBm gives approximately a 0.4dB underestimation of the power.

Then I took a measurement of the power after the 2W amp at the end of the cable that would plug into SPI prep. Namely I adjusted the power from Keysight, such that the output measured on the probe was 32dBm which is what SPI prep is expecting accounting for any possible underestimation of the power. Note that power past the 2W amp decreases over time (by about 0.5dB total) as the device warms up so I had to wait a couple of hours after start-up to take this measurement. The results were:

AMP 1 (Which goes into the ref path) measured 32dBm when the keysight displayed: -1.7dBm

AMP 2 (Which goes into the Meas path) measured 32dBm when the keysight displayed: -0.3dBm

Be aware that that 32dBm has an error of +/- 0.5dB due to the factors listed above. 

Then using the fact above, I found that the whole AMP 1 chain has a gain of 33.7 dBm from what the keysight displays. And AMP 2 chain has a total gain of 32.3dBm from what the keysight displays. Using this fact I could find the voltage associated with each of the monitor channels of SPI prep.

Monitor_read_AMP1_REF.png and Monitor_read_AMP2_MEAS.png show the monitor reading voltage vs the approximate input RF power into SPI prep. for both channels. Interpolating the results gives a calibration equation between RF power and monitor voltage of: 

AMP 1 (REF):  [V] = -0.0249*[dBm] + 1.5480

AMP 2 (MEAS):  [V] = -0.0246*[dBm] + 1.5387

With both channels reaching 32dBm around 0.75V on the monitor channel this gives an easy target for controling the power.