Oli, Ibrahim

As a follow-up to yesterday's alog (80689), attached are plots showing length and pitch M1 transfer functions for the four measurements between LHO and LLO taken between August 30th and October 11th, with different M1 blade positions, compared to their matching models (different d1 values).

The d1 values given in the legend for each model are the physical d1 values (based on the model), aka in the same set of d1 values as the ones originally given in the FDR document. Note that these d1 values differ from the d1 values given next to the measurements in Ibrahim's allbbss TFs from yesterday, since those d1 values are based on the actual blade locations and theoretical center of mass. So since these d1 values don't line up between the model d1's and the d1's we get based on where we put the blades, there is something more going on. The models don't correspond to where we would expect to see a bp of -4mm (avg), so this is something we will be discussing.

Wed Oct 16 10:15:38 2024 INFO: Fill completed in 15min 34secs

Closes FAMIS 26012. Last checked in alog 80608. 

No significant changes from last week.

Overnight the ITMX coil driver states were wrong, causing the ASC controls to satuate the PUM durring acquisition.  (This become aparent when the DHARD gains are increased at the end of DHARD WFS, which happens right before PARK_ALS_VCO 80699)

This used to be reset in ISC_LOCK PREP_FOR_LOCKING state, this has been commented out (line 618), with a note that SDF will take care of this, this has been commented out in the guardian for over a year.  Indeed. we found that the coil driver state was incorrectly set to 3

The attached screenshot shows the error was introduced to the safe.snap sometime between 2:30 and 5 pm yesterday, as it was correctly reset in the first two locking attempts of the day, but wasn't correctly reset after the lockloss at 5 local time last night. 

TITLE: 10/16 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.27 μm/s
QUICK SUMMARY:
TJ was up all night damping Violin modes!
When I walked in IFO was Unlocked and struggling to lock green arms.
Relocking:
I've Requested Inintial Alignment.
 

Been trying to get the violins down for the past 2 hours and made barely any progress. Many of the problem modes on ITMX just didn't seem to respond positively to any gains that have worked in the past. We just lost lock, so I'll try some damping on RF and see if that can somehow help.

TITLE: 10/16 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

IFO is LOCKING at CHECK_VIOLINS_BEFORE_POWERUP.

Violins:

We lost lock at 00:09 UTC (lockloss alog 80697) and have not been able to get to NLN since. A local earthquake rung violins up violently such that some are in the 8/9 zone. While the alignment is great, (DRMI locked without PRMI 5 times), we have IX saturations starting at PARK_ALS_VCO. I initially thought this was an ALS or maintenance Tuesday issue, but that doesn't seem to be the case. After chatting to Jenne, we realized that it was indeed the violins. So I started damping.

Setting all violins to their nominal damping states successfully prevented IX from saturating at ENGAGE_ASC_FOR_FULL_IFO, where it was saturating consistently. Moving to CHECK_VIOLINS_BEFORE_POWERUP results in 1 saturation/second, losing lock eventually (after 30 mins or so). Any form of powerup also loses lock immediately. I  talked to Rahul, and he recommended staying at a steady state to damp for a few hours since sometimes it just takes that long. Spoke to the incoming operator, TJ and he's been informed of the unsteady state of the IFO.

I'm already past this state but my recommendation (from speaking to Rahul) would be to stay at PREP_ASC_FOR_FULL_IFO at nominal damping for a few hours.

FAMIS 27800 TCS Chiller Water Level Top-Off_Weekly

TCS CO2X Level before : 29
added 250 ml
TCS CO2X Level after : 30

TCS CO2Y Level before : 9
added 200 ml
TCS CO2Y Level after : 10
 

Nothing seemed out of place, I saw no leaks.
Noted in the following TCS Chiller spreadsheet:
https://docs.google.com/spreadsheets/d/1Mu7-pmjWiRQxU3rX3lI0LB4UXI9asC-efkCnS9sT58k/edit?gid=0#gid=0

Lockloss due to an EQ from Mexico. EQ mode activated but ground motion was too high and we lost lock 3 mins after EQ mode.

Ibrahim, Oli

Below are updates and promising findings concerning the most recent BBSS LHO Top Mass -4mm BP Adjustments to tackle the F1 Drift issue summarized in alog 80577.

On Friday 10/11, Oli P and I moved the blade positions (mm BP Units) to:

Front Left: Side: 0.02, Top: -4.03 Back Left: Side: -0.03, Top -3.90 Front Right: Side: 0.02, -3.91 Back Right: Side: -0.05, -3.95 Avg: Side: -0.01 Height: -3.95

Find:

• LHO Transfer Functions PDF
• LHO and LLO different Blade Positions Comparison PDF (essentially the plot from alog 80589 but with the newest 10/11 results).
• LHO BOSEM (Top Mass and PUM) Counts

The good news is that with these 4.5 days of Data, we see no sign of F1 Drift.

We will post another alog with TF to model comparisons as we find which model d1 parameter fits these -4mm BP positions best.

J. Kissel
WP 12140

I've completed 6 SUS + 4 ISI = 10 of 12 total DOF excitations that I wanted to drive before I ran out of time this morning. Each drive was "successful" in that I was able to get plenty of coherence between the 4 DOFs of ISI drive and SUS response, and some coherence between 6 SUS drive DOFs and ISI response. As expected, the bulk of the time was spent tuning the ISI excitations. I might have time to "finish" the data set and get the last two missing DOFs, but I was at least able to get both directions of LPY to LPY transfer functions, which are definitely juicy enough to get the analysis team started.

Measurement environmental/configuration differences of the HAM2 ISI from how they are nominally in observing:
    - PR3 M1 DAMP local damping loop gains are at -0.2, where they are nominally at -1.0. (The point of the test.)
    - CPS DIFF is OFF. (needed to do so for maintenance day)
    - Coil Driver z:p = 1:10 Hz analog low-pass (and digital compensation for it) is OFF. (need to do so to get good SNR on SUS M1 drive without saturating the SUS DACs)

Interesting things to call out that are the same as observing:
    - The PR3 alignment sliders were ON. P = -122 [urad]; Y = 100 [urad]. (Don't *expect* dynamics to change with ON vs. OFF, but we have seen diagonal response change if close an EQ stop. Haven't ever looked, but I wouldn't be surprised of off-diagonal responses change. Also DAC range gets consumed by DC alignment request, which is important for driving transfer functions.)
    - Corner station sensor correction, informed by the Bier Garten "ITMY" T240 on the ground. (the h1oaf0 computer got booted this morning, so we had to re-request the SEI_CS configuration guardian to be in WINDY. The SEI_ENV guardian had been set to LIGHT_MAINTENANCE.)
    - PR3 is NOT under any type of ISC global control; neither L, P, or Y. (global ISC feedback for the PRC's LPY DOFs goes to PRM and PR2.)

There are too many interesting transfer functions to attach, or even to export in the limited amount of time I have. 
So -- I leave it to the LSC team that inspired this test to look at the data, and use as needed.

The data have been committed to the SVN here:
    /ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/PR3/SAGM1/Data/
        2024-10-15_1627_H1SUSPR3_M1_WhiteNoise_L_0p02to50Hz.xml
        2024-10-15_1627_H1SUSPR3_M1_WhiteNoise_T_0p02to50Hz.xml
        2024-10-15_1627_H1SUSPR3_M1_WhiteNoise_V_0p02to50Hz.xml
        2024-10-15_1627_H1SUSPR3_M1_WhiteNoise_R_0p02to50Hz.xml
        2024-10-15_1627_H1SUSPR3_M1_WhiteNoise_P_0p02to50Hz.xml
        2024-10-15_1627_H1SUSPR3_M1_WhiteNoise_Y_0p02to50Hz.xml

    /ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/PR3/Common/Data
        2024-10-15_1627_H1ISIHAM2_ST1_WhiteNoise_PR3SusPoint_L_0p02to50Hz.xml
        2024-10-15_1627_H1ISIHAM2_ST1_WhiteNoise_PR3SusPoint_T_0p02to50Hz.xml
            [ran out of time for V]
            [ran out of time for R]
        2024-10-15_1627_H1ISIHAM2_ST1_WhiteNoise_PR3SusPoint_P_0p02to50Hz.xml
        2024-10-15_1627_H1ISIHAM2_ST1_WhiteNoise_PR3SusPoint_Y_0p02to50Hz.xml


For the SUS drives templates, I gathered:
     Typical:
     - The top mass, M1, OSEM sensors, in the LTVRPY Euler Basis, calibrated into microns or microradians, [um] or [urad].
         H1:SUS-PR3_M1_DAMP_?_IN1_DQ             [Filtered with the 64x filter, then downsampled to to fs = 256 Hz]
     - The top mass, M1, OSEM sensors, in the T1T2T3LFRTSDD OSEM Sensor/Coil Basis, calibrated into microns, [um].
         H1:SUS-PR3_M1_OSEMINF_??_OUT_DQ         [Filtered with the 64x filter, then downsampled to to fs = 256 Hz]
     - The top mass, M1, OSEM coils' requested drive, in the T1T2T3LFRTSD OSEM Sensor/Coil Basis, in raw (18 bit) DAC counts, [ct_M1SUS18bitDAC].
         H1:SUS-PR3_M1_MASTER_OUT_??_DQ          [Filtered with the 32x filter, then downsampled to to fs = 512 Hz]

     For this set of templates:
     - The bottom mass i.e. optic, M3, OSEM sensors, in the LPY Euler Basis, calibrated into microns or microradians, [um] or [urad].
         H1:SUS-PR3_M3_WIT_?_DQ                  [Filtered with the 64x filter, then downsampled to to fs = 256 Hz]
     - The bottom mass i.e. optic, M3, optical lever, in PIT YAW Euler Basis, calibrated into mircoradians, [urad].
         H1:SUS-PR3_M3_OPLEV_???_OUT_DQ          [Filtered with the 64x filter, then downsampled to to fs = 256 Hz]
     - The ISI's Stage 1 GS13 inertial sensors, projected to the PR3 suspension point LTVRPY Euler basis, calibrated into nanometers or nanoradians, [nm] or [nrad]
         H1:ISI-HAM2_SUSPOINT_PR3_EUL_?_DQ       [Filtered with the 4x filter, then downsampled to to fs = 1024 Hz]
     - The ISI's Stage 1 super sensors, in the ISI's Cartesian XYZRXRYRZ basis, calibrated into nanometers or nanoradians, [nm] or [nrad]
         H1:ISI-HAM2_ISO_*_IN1_DQ                [Filtered with the 2x filter, then downsampled to to fs = 2048 Hz]

Note: The six M1 OSEM sensors in the Euler Basis are set to be the "A" channels, such that you can reconstruct the transfer function between the M1 Euler Basis to all the other response channels in the physical units stated above. As usual the excitation channel for the given drive DOF (in each template, that's H1:SUS-MC3_M1_TEST_?_EXC) is automatically stored, but these channels are in goofy "Euler Basis (18-bit) DAC counts," so tough to turn into physical units.

For the brand new ISI drive templates, I gathered:
     - The ISI's Stage 1 super sensors, in the ISI's Cartesian XYZRXRYRZ basis, calibrated into nanometers or nanoradians, [nm] or [nrad]
         H1:ISI-HAM2_ISO_*_IN1_DQ                [Filtered with the 2x filter, then downsampled to to fs = 2048 Hz]
     - The ISI's Stage 1 GS13 inertial sensors, projected to the PR3 suspension point LTVRPY Euler basis, calibrated into nanometers or nanoradians, [nm] or [nrad]
         H1:ISI-HAM2_SUSPOINT_PR3_EUL_?_DQ       [Filtered with the 4x filter, then downsampled to to fs = 1024 Hz]

     - The top mass, M1, OSEM sensors, in the LTVRPY Euler Basis, calibrated into microns or microradians, [um] or [urad].
         H1:SUS-PR3_M1_DAMP_?_IN1_DQ             [Filtered with the 64x filter, then downsampled to to fs = 256 Hz]
     - The bottom mass i.e. optic, M3, OSEM sensors, in the LPY Euler Basis, calibrated into microns or microradians, [um] or [urad].
         H1:SUS-PR3_M3_WIT_?_DQ                  [Filtered with the 64x filter, then downsampled to to fs = 256 Hz]
     - The bottom mass i.e. optic, M3, optical lever, in PIT YAW Euler Basis, calibrated into mircoradians, [urad].
         H1:SUS-PR3_M3_OPLEV_???_OUT_DQ          [Filtered with the 64x filter, then downsampled to to fs = 256 Hz]
     - The ISI's Stage 1 actuators' requested drive, in the H1H2H3V1V2V3 ISI actuator basis, in raw (16-bit) DAC counts, [ct_ISIST116bitDAC].
         H1:ISI-HAM2_OUTF_??_OUT                 [Didn't realize in time that there are DQ channels H1:ISI-HAM2_MASTER_??_DRIVE_DQ stored at fs = 2048 Hz, or I would have used those.]

Note: Here, I set the number of "A" channels to twelve, such that both the ISI's Cartesian basis and the PR3 Suspoint basis versions of the GS13s can be used as the transfer function reference channel.