TITLE: 10/16 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 7mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.36 μm/s 
QUICK SUMMARY:

• MIcroseism is starting to hit the 90th percentile, wind is low
• CDS, dust, and temperatures look good
• IFO beens in GREEN_ARMS_MANUAL with XARM struggling to lock overnight

TITLE: 10/16 Eve Shift: 2330-0300 UTC (1630-2000 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: None
SHIFT SUMMARY: I've been picking up where commissioners left off this afternoon trying to engage more full IFO ASC loops.

When we reached PREP_ASC for the first time on my shift, I updated the green alignment references (SDF screenshots attached). My intention tonight was to get the references updated again once more ASC was on, but this proved slow-going as there have been many locklosses in PREP_ASC between 2 and 30 minutes spent in the state. By hand, I was enabling CHARD, INP1, and PRC2 (all P&Y) without any adjustment needed, then I moved PRM in pitch to bring the ADS PIT3 error signal to zero and close it as well. At 01:55 UTC (GPS 1476150918) is when I had all of these loops closed and close to converged. My plan after that was to start moving PRM in yaw to close YAW3, but we lost lock and haven't spent enough time in PREP_ASC on subsequent relocks since then for me to finish that process.

Relocking up to PREP_ASC continues to be smooth, and Sheila is taking over commissioning for the evening.

Sheila, Louis, Elenna

We have been repeatedly locking fairly well to prep_asc_for_full_ifo. We have set some green references to a decent alignment. However, we have not been able to set the green references to the alignment that we think is best, which we got to after we walked dofs and closed some loops. However, the attached green references get us close enough.

We have successfully closed CHARD, INP1 and PRC2 P and Y. We tried closing MICH P without problems, but closing MICH Y seems to cause problems either by itself or with MICH P. We also starting walking the PRM to bring ADS3 to zero, but only got about a third of the way before a lockloss.

When we did successfully close MICH P, we did so with half gain, this gives about a 0.5 Hz UGF, based on this somewhat sketchy OLG. The design is for 2 Hz, but we think this is ok for now.

I disengaged PRC1 loop in DRMI ASC for now until we know what PRM alignment we will be happy with in full lock. The PRC1 error signal is set by arbitrary offsets on POP A, and we may prefer a different PRM alignment in full lock.

Sheila, Oli, and I took a look at some of our locklosses. We continue to lose lock while sitting in prep_asc, some we can attribute to alignment engagement going haywire, and others we have no reason for. The lockloss tool seems to be tagging many of these locklosses as "IMC" meaning that the IMC is dropping out within 50 ms of the power drop on AS_C. However, Oli notes that the L2 signals of all four test masses seem to be diverging even before the IMC drops out, so maybe this tag is misleading. The behavior of the coil drives suggests that maybe something is going wrong in DHARD P.

Sheila and I found that there are two DARM boosts we could be engaging, that are usually engaged around DARM offset or PREP DC readout. This might help suppress some low frequency DARM motion that DHARD could also be seeing. I moved both of these boosts to DRMI_TO_POP.

As a side note, we successfully used Stefan's "wfsreliefpast.py" script to revert to some good alignment we had when walking full IFO alignment!

TITLE: 10/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: Commissioners worked on ASC loops and CARM, the IFO can relock up to DRMI pretty quickly with its current alignment.
LOG:

• We had some trouble in the morning, after the first lockloss DRMI and PRMI both had trouble relocking. Initial Alignment gave us trouble as the IMC couldn't/wouldn't stay locked for INPUT_ALIGN, the FSS kept unlocking. The FSS ended up getting stuck in a loop of 4-3 and then state 2-3, Sheila reverted the alignment to an earlier one with better IR flashes and we skipped input align. PRC went well, MICH_DARK I did by hand, then SR2 was fine but we struggled to lock SRY, adjusting SRM in P helped. Once we got to PRMI the alignment still didn't look great, Elenna adjusted IM4, PR2, BS, and PRM to improve it and then SRM in DRMI as usual.
• All of the CARM_TO_TR locklosses we've had in the past two days (4) appear to be IMC locklosses.
• More ASC loop and CARM measurements at PREP_ASC_FOR_FULL_IFO
  • 22:21 UTC An IMC lockloss took us down while commissioners were walking alignments
• Most of locklosses seem to be IMC locklosses this afternoon, from PREP_ASC, and START_TR_CARM

TITLE: 10/15 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 18mph Gusts, 11mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.25 μm/s 
QUICK SUMMARY: Commissioning continuing, currently in PREP_ASC and setting green alignment references.

Closes FAMIS85193, last checked in alog92229

For the OUT building fans, EX_FAN2_570_2 (yellow) looks a bit noisier, on MY_FAN2_270_1 (pink), the noise seems more periodic than previously. They're all under 0.7.

For the CS building fans, everything looks fine.

Closes FAMIS85193, last checked in alog92117
Laser Status:
    NPRO output power is 1.842W
    AMP1 output power is 70.67W
    AMP2 output power is 139.8W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 23 days, 5 hr 24 minutes
    Reflected power = 29.77W
    Transmitted power = 104.9W
    PowerSum = 134.7W

FSS:
    It has been locked for 0 days 0 hr and 8 min
    TPD[V] = 0.5066V

ISS:
    The diffracted power is around 2.8%
    Last saturation event was 0 days 0 hours and 9 minutes ago

Possible Issues:
    PMC reflected power is high

Over the years, we've changed the order of guardian states, but choose not to renumber them during O4 so that trending would not be confusing.  I've now renumbered several guardain states in ISC_LOCK, so that they now appear on the medm screen in the order that they happen.  I also moved their locations in the ISC_LOCK file, so that file is more closely ordered in the way things happen. 

I've deleted 4 states that were in use when we were changing our DARM loop but are no longer used. 

Camilla, Miriam, Travis, Sophie

First attempt measuring the beam after a long propagation distance using the FLIR camera. Here are the measurement distances, laser power settings and corresponding images. Using the Fintrace model the beamsize at each point was modelled. 

note: Nominal distane to ITM is 36.735m but will be subject to exact table placement

Here is a drive with the pictures: https://drive.google.com/drive/folders/153uQSwYIMZdKYFz6KgaSdyBdOywcY-T0?usp=drive_link

A comment will be added with the procedure :)

Last night, at 2W, we adjusted gains on the common mode board to achieve a carm UGF of about 15 kHz with 56 deg of phase margin, which we thought was close enough to our target (92306). I searched back in the alog and found a time when Sheila and Matt measured the CARM OLG at 2 W during O4 (May 2025), 84644. Matt reported a ugf of 11 kHz with 41 deg of phase margin.

Below is a table comparison of the common mode board gains between last night and this time in May 2025.

This means that we have overall increased the common mode board gain by 4 dB, and maybe held on to more phase by not engaging the common comp boost. Perhaps we could drop the gain by 4 dB and have more room to turn on the comcomp.

Last night, we were worried that we might have lost some optical gain in CARM. However, this comparison indicates that actually we probably are the same as before.

TITLE: 10/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 3mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.22 μm/s 
QUICK SUMMARY:

• Low wind, dust and temps look good, a little chilly out this morning
• It looks like the IFO has spend most of the night in PRMI_ASC, till 3 hours ago and it has not been able to lock ALSY
  • A few taps of TMSY_P then ETMY_P got it to lock
• H0:VAC-MR_IPFCB2_CSB2_STATUS has been going in and out of alarm for the past two days (since 10/13 13:28 UTC)

Elenna, Sheila, Louis, Ryan Crouch, Tony

Summary- The IFO seems stable with ANALOG_CARM, and several ASC loops have been engaged.

• The recycling gain is fairly good (usually around 48-49 when we get to resonance). 
•  There was one lock last night where we were in PREP_ASC for long enough to see what the ADS signals were, they were at about the level of the limiters for pitch, so we would move the spot positions if we were to engage these loops (or walk them).  (screenshot)
• Several of the locklosses were caused by a 90 Hz ring up, although none of the LSC OLGs that Ryan measured last night seem unstable there. (screenshot)  This was probably caused by the gain of MCL being too high in the state resonance, this morning we moved the gain reduction for MCL from CARM_TO_ANALOG to resonance so that we can sit more stably in this state. (MCL OLG screenshot)
• PRCL UGF seemed a bit low at 30Hz, we increased the gain from 8 to 14 to get the ugf at 50 Hz (screenshot).  We’ve now added this gain to the input matrix used in DRMI_TO_POP. 
• Elenna noticed that SRC align doesn’t check if the AS WFS are centered, only refl. REFL used to be used for src align but now AS45 is used. Updated align_ifo guardian
• We can close MICH P and Y, and CHARD, PRC2, INP1 P and Y. REFL loop signs have flipped, this is updated in LSCparams. Probably flipped due to rephasing, refl45 phases changed by ~90 deg
• Louis updated CARM_TO_ANALOG to skip multiple gain redistribution stages & added some gain adjustments to bring the CARM UGF to ~16kHz (plot). We must have lost some optical gain or something because the CARM gains from O4 would leave the CARM UGF at closer to 8kHz. We can come back to revisit the gain distribution from a noise perspective down the road.
• The IFO has now been sitting at CARM_TO_ANALOG for 40 minutes, I've had to touch PRM and SRM to keep the build ups good since there isn't much ASC engaged right now.  Lost lock because I think I clicked the wrong place with my no machine lagging.  
• I looked at ASC_C while sitting in ANALOG_CARM, although the vioiln modes look huge on the RF DARM spectrum, they aren't big enough to be a problem on AS_C.  

TITLE: 10/15 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: None
SHIFT SUMMARY:

NUC 30 never got re-imaged tonight as people were still actively using it.
 
Locking Notes:
Got up to PREP_ASC_FOR_FULL_IFO[429] @ 00:45 UTC for the first time tonight.
Duration: Stayed there for 14 minutes 48 seconds.  
Violin Damping: Damping On RF actually started 11 minutes into Prep-ASC_4_F-IFO and Damping Lasted 3 minutes. 
Delta PR_GAIN increased by ~0.6 once the damping started. 
Initial mean:46.823
Final mean : 47.59
PopAIR_B_RF18:  changed by -4.4 in the 14 minutes but it was a gradual change and the variabliliy in the signal may exceed this.
Initial: 101.9
Final: 97.51
PopAir_B_RF90 changed by +4.2 in the 14 minutes also gradually with variability in the signal. 
Initial:15.3
Final: 19.4
Lockloss at 00:59 UTC

Next attempt reached Prep ASC @ 1:15 UTC & lasted 5 minutes.
Damping started but lost lock before VIOLIN_DAMPING guardian got out of DAMPING_SETTINGS[3]. 
PR_GAIN: mean increased by ~0.18 in that duration.
Initial Mean: 47.32
Final Mean: 47.53

PopAir_B_RF18: No change 
PopAir_B_RF90 delta : 1.48 
Initial: 19.15
Final: 20.64 
Lockloss @ 1:20 UTC


Next attempt reached Prep ASC @ 1:40 UTC & lasted 6 minutes.
Damping started but lost lock before VIOLIN_DAMPING guardian got out of CLEAR_MONITORS[4]. 
delta PR_GAIN: mean increased by ~0.14 in that duration
Initial:47.25
Final:47.4

Delta PopAir_B_RF18: -3.2
Initial:101.27
Final:97.5

Delta PopAir_B_RF90: +2.1 
Initial: ~15.91  
final: ~18.08

Lockloss @ 1:46 UTC


Next Prep_ASC_For_FULL_IFO @ 158 UTC
Duration: 3 minutes.
No Violin damping.
PR_GAIN DELTA: 0.2
Initial:47.3
Final:47.5

PopAir_B_RF18 delta: no change
PopAir_B_RF90 delta: no change

Lockloss from Prep ASC @ 2:02 UTC

Lockloss from Start_TR_CARM @ 2:25 UTC

Arrived at Prep_ASC_For_FULL_IFO @2:51 UTC
Lockloss from Prep_ASC_For_FULL_IFO @ 2:52 UTC 
 

LOG:

TITLE: 10/14 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Commissioning
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 5mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.20 μm/s 
QUICK SUMMARY:
H1 is currently Aquiring_DRMI_1F. 
The commissioning team is back at it again sittign in RESONANCE [410] coming up with a game plan to get to CARM_to_Analog [420] without a lockloss.
  
VAC team went to investigate CP3 fill line.

NUC 30 will be down for a while so I can swap it's hard drive and re-image it.
 

Caroline C and I went down to EX... again.... (Sorry EY, I know it was your turn, but next time I promise I'll measure you... )
We took the PS4 Working Standard (WS) integrating sphere down to EX.
We found EX's PCAL system is covered in caution tape, like it was in the center of a foreboding crime scene!  

Unfortunately the red Current Limit LED was Lit again, and I trended the channel H1:CAL-PCALX_LASERDIODECURRENT back to find it has been lit up since last Tuesday. Supisiously close to the beckhoff restart time. I'm not sure which channel is best to check for beckhoff restarts yet.  I was able to just move the voltage down a little and back up to rectify this issue before starting the measurement.

We took some pictures of the beam spots before we started to prove our innocence.
Followed instructions on T1500062 and followed it without any deviations from our part. The SEI system was put in ISI Damped HEPI offline for this measurement for other work though. 
Everything went as smooth as it can while dodging lifts, scaffolding, and caution tape.
Took some After measurement beam spot pics to prove our innocence again. 

Overall I don't think the GV20 work had any real impact on PCAL pointing or performance. Shoutout to the GV20 team for doing such a great job! 


Wanna see the Absolute Calibration details of this specific measurement and the commands input and output? :

@cdsws25: python3 generate_measurement_data.py --WS PS4 --date 2026-10-13
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2026-10-13 corrected to ES temperature 299.8 K :
-4.700380443762894 -0.0002694340454223 0.0007505543347185126
Copying the scripts into tD directory...
Connected to h1daqnds1
martel run
reading data at start_time:  1475945650
reading data at start_time:  1475946100
reading data at start_time:  1475946460
reading data at start_time:  1475947100
reading data at start_time:  1475947444
reading data at start_time:  1475947820
reading data at start_time:  1475947998
reading data at start_time:  1475948640
reading data at start_time:  1475949030
Ratios: -0.45984106211593845 -0.46714267909102675
writing nds2 data to files
finishing writing
Background Values:
bg1 =        9.805339; Background of TX when WS is at TX
bg2 =        5.167711; Background of WS when WS is at TX
bg3 =        9.886270; Background of TX when WS is at RX
bg4 =        5.195956; Background of WS when WS is at RX
bg5 =        9.755134; Background of TX
bg6 =        0.367068; Background of RX

The uncertainty reported below are Relative Standard Deviation in percent 

Intermediate Ratios
RatioWS_TX_it      = -0.459841;
RatioWS_TX_ot      = -0.467143;
RatioWS_TX_ir      = -0.454541;
RatioWS_TX_or      = -0.462195;
RatioWS_TX_it_unc  = 0.068338;
RatioWS_TX_ot_unc  = 0.070460;
RatioWS_TX_ir_unc  = 0.074890;
RatioWS_TX_or_unc  = 0.065120;
Optical Efficiency
OE_Inner_beam                      = 0.988231;
OE_Outer_beam                      = 0.989349;
Weighted_Optical_Efficiency        = 0.988790;

OE_Inner_beam_unc                  = 0.046695;
OE_Outer_beam_unc                  = 0.045578;
Weighted_Optical_Efficiency_unc    = 0.065252;

Martel Voltage fit:
Gradient      = 1636.946737;
Intercept     = 0.081815;

 Power Imbalance = 0.984370;

Endstation Power sensors to WS ratios::
Ratio_WS_TX                        = -1.078768;
Ratio_WS_RX                        = -1.391922;

Ratio_WS_TX_unc                    = 0.042184;
Ratio_WS_RX_unc                    = 0.040097;

=============================================================
============= Values for Force Coefficients =================
=============================================================

Key Pcal Values :
GS           =      -5.135100; Gold Standard Value in (V/W)             
WS           =      -4.700380; Working Standard Value             

costheta     =      0.988362; Angle of incidence
c            =      299792458.000000; Speed of Light
             
End Station Values : 
TXWS         =        -1.078768; Tx to WS Rel responsivity (V/V)
sigma_TXWS   =        0.000455; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS         =        -1.391922; Rx to WS Rel responsivity (V/V)
sigma_RXWS   =        0.000558; Uncertainity of Rx to WS Rel responsivity (V/V)

e            =        0.988790; Optical Efficiency
sigma_e      =        0.000645; Uncertainity in Optical Efficiency

Martel Voltage fit : 
Martel_gradient         =        1636.946737; Martel to output channel (C/V)
Martel_intercept   =        0.081815; Intercept of fit of     Martel to output (C/V)

Power Loss Apportion : 
beta          =        0.998895; Ratio between input and output (Beta)  
E_T          =        0.993829; TX Optical efficiency 
sigma_E_T          =        0.000324; Uncertainity in TX Optical efficiency 
E_R          =        0.994929; RX Optical Efficiency 
sigma_E_R          =        0.000325; Uncertainity in RX Optical efficiency 

Force Coefficients : 
FC_TxPD          =        7.894807e-13; TxPD Force Coefficient 
FC_RxPD          =        6.188002e-13; RxPD Force Coefficient 
sigma_FC_TxPD          =        3.610367e-24; TxPD Force Coefficient 
sigma_FC_RxPD          =        2.777621e-24; RxPD Force Coefficient 

data written to CDS: /ligo/gitcommon/Calibration/pcal/O4/ES/measurements/LHO_EndX/tD20261013

That's cool and all but perhaps you wanna see that data with relation to the End X's history, I gotchu: 
You can see the trends here or go to the git page for this measurement.