[Paco, Yuta]

We checked the polarity of suspension damping loops if they follow the conventions we agreed in 40m/16898.
Suspensions are nicely homogenized nicely , with some exceptions (see Attachment #1).

• ​PRM SDSEN_GAIN is 0.2, but it should be 1.
• LO1, LO2, AS1, AS SDCOIL_GAIN is +/-13, but it should be +/- 1. (Unless there are reasons for these 13)
• Let's make coil dewhitening to be off (in Acq mode) for all by default to homogenize (40m/17875). MC1 and MC3 might require 28Hz ELP for 60Hz noise.
• INMAT should be normalized nicely so that SUSPOS/SIDE_IN will be um and SUSPIT/YAW_IN will be urad. (Are cnts2um in *SEN filters correct?)
• Gain offsets in *COIL filters (e.g. V2A, x0.414) can be adjusted later to have the same actuation efficiencies between suspensions.

Note that *COIL_GAIN are now +--++ or flipped one in the order of UL/LL/UR/LR/SD.

Next:
  - Address the points raised above
  - Make a script to show current EPICs values for all suspensions to check the damping configurations.

PRM/SRM OSEM input calibration

- I realized I had not yet updated the input OSEM cts2um calibration. For PRM and SRM, I changed each cts2um filter gain from 0.36 ---> 0.0417 (factor of 8.64).

- The coil output filters (V2A) had already been updated according to new actuation calibration.

PRM damping/alignment

- As noted in the previous ELOG, PRM SDSEN gain was 0.2 instead of 1. I turned on damping filters for PRM and noticed SD motion was underdamped. I changed PRM SDSEN GAIN from 0.2 ---> 1. Final PRM damping test in Attachment 1.

- With PRM alignment restored (no PIT offset in output matrix), the PRM oplev is aligned and is recording light.

- I left PRM with a misalignment offset (damping loops on; oplev loops off).

SRM damping/alignment

- I performed a damping test of SRM with the optic alignment restored (no PIT offset in output matrix). This way the OSEMs were not saturated. In this configuration, SRM passed a damping test [Attachment 2].

- However in this configuration, no light was hitting the oplev. I tried to manually align but gave up after I saw no improvement. Which raises the question, was the SRM oplev ever (recently) aligned?

- I left SRM with a misalignment offset, but in this state the OSEMs saturate and the damping loops drive unstable motion. So SRM damping loops are off.

To further homogenize the suspensions, we did the following changes.

 - Turned on DECIMATION in PR2 URCOIL
 - Changed +/- 13 in SDCOIL_GAIN of SR2,LO1,LO2,AS1,AS4 to +/-1 and increased SUSSIDE_GAIN accordingly
 - PRM SDSEN_GAIN was changed from +0.2 to +1 (see 40m/17877)
 - Moved FM6 "gain_offset" of gain(0.48) to FM1 in ETMY *COIL to align with other suspensions. Also added x0.48 to SDCOIL as well, and adjusted SUSSIDE_GAIN accordingly.
 - "Half shorted" binary inputs to coil drivers for PR2,PR3,SR2,LO1,LO2,AS1,AS4 so that they are always in "Acq" mode. FM9 SimDW filters were turned on accordingly.

Before work today:

2023-09-28 17:10:19 UTC (GPS: 1379956237)
channel\optic   MC1     MC2     MC3     BS      ITMX    ITMY    PRM     SRM     ETMX    ETMY    PR2     PR3     SR2     LO1     LO2     AS1     AS4     
ULSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
LLSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
URSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
LRSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
SDSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +0.20   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
ULSEN_SWSTAT      37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923 
LLSEN_SWSTAT      37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923 
URSEN_SWSTAT      37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923 
LRSEN_SWSTAT      37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923 
SDSEN_SWSTAT      37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923 
SUSPOS_GAIN     +120.00 +150.00 +100.00 +100.00 +150.00  +50.00  +28.00  +25.00 +150.00  +41.00   +8.00  +10.00  +27.00  +10.00  +10.00  +14.00  +15.00 
SUSPIT_GAIN      +60.00  +10.00  +24.00  +10.00  +14.00   +7.00   +5.00   +1.20  +15.00   +6.00   +2.00   +5.00   +6.00   +4.00   +3.00   +2.50   +3.10 
SUSYAW_GAIN      +60.00  +10.00   +8.00   +3.00  +10.00   +8.00   +4.00   +1.50  +10.00   +6.00   +2.00   +5.00   +6.00   +3.00   +3.00   +3.00   +3.00 
SUSSIDE_GAIN    +100.00 +150.00 +125.00  +10.00  +60.00  +50.00  +50.00   +7.50 +150.00 +300.00  +11.54  +20.00  +10.77   +3.08   +3.85   +6.54   +3.15 
OL_PIT_GAIN       +1.00   +1.00   +1.00   -0.05   +5.00   +3.50   +6.00  +12.68   +1.00   -1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
OL_YAW_GAIN       +1.00   +1.00   +1.00   +0.10   +5.00   -4.00   -8.00  -15.85   +1.00   -1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
ULCOIL_GAIN       +1.01   +1.07   +0.94   +1.06   -1.10   +1.06   +0.97   +1.09   -1.01   -1.00   -1.00   -1.00   -1.00   -0.94   -1.05   -0.94   -0.98 
LLCOIL_GAIN       -0.95   -0.98   -0.94   -0.98   +0.90   -1.01   -1.04   -1.00   +0.97   +0.81   +1.00   +1.00   +1.00   +0.98   +0.63   +0.99   +0.97 
URCOIL_GAIN       -0.98   -0.98   -1.04   -1.04   +0.93   -0.99   -1.04   -0.92   +1.03   +0.74   +1.00   +1.00   +1.00   +1.00   +1.34   +1.04   +0.98 
LRCOIL_GAIN       +1.06   +0.97   +1.08   +0.92   -1.07   +0.94   +0.90   +0.99   -0.99   -1.05   -1.00   -1.00   -1.00   -1.07   -0.98   -1.03   -1.07 
SDCOIL_GAIN       +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   -1.00   -1.00   -1.00   -1.00  -13.00  -13.00  -13.00  +13.00  -13.00 
ULCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   55041   38688   38400   38400   38400   38400   38400   38400   38400 
LLCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   38657   38688   38400   38400   38400   38400   38400   38400   38400 
URCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   38657   38688    5632   38400   38400   38400   38400   38400   38400 
LRCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   38657   38688   38400   38400   38400   38400   38400   38400   38400 
SDCOIL_SWSTAT     37889   38657   37889   38145   38145   38145   38145   38145   38657   38656   38144   38144   38144   38144   38144   38144   38144 

After work today:

2023-09-28 18:26:55 UTC (GPS: 1379960833)
channel\optic   MC1     MC2     MC3     BS      ITMX    ITMY    PRM     SRM     ETMX    ETMY    PR2     PR3     SR2     LO1     LO2     AS1     AS4     
ULSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
LLSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
URSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
LRSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
SDSEN_GAIN        +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00 
**SEN_SWSTAT      37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923   37923 
(...snip...) 
SUSSIDE_GAIN    +100.00 +150.00 +125.00  +10.00  +60.00  +50.00  +50.00   +7.50 +150.00 +625.00  +11.54  +20.00 +140.00  +40.00  +50.00  +85.00  +40.00 
(...snip...)
SDCOIL_GAIN       +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   +1.00   -1.00   -1.00   -1.00   -1.00   -1.00   -1.00   -1.00   +1.00   -1.00 
ULCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   55041   38657   38656   38656   38656   38656   38656   38656   38656 
LLCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   38657   38657   38656   38656   38656   38656   38656   38656   38656 
URCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   38657   38657   38656   38656   38656   38656   38656   38656   38656 
LRCOIL_SWSTAT     37889   38657   37889   38657   38657   38657   38657   38657   38657   38657   38656   38656   38656   38656   38656   38656   38656 
SDCOIL_SWSTAT     37889   38657   37889   38145   38145   38145   38145   38145   38657   38657   38144   38144   38144   38144   38144   38144   38144 

ULCOIL_STAT of ETMY being 55041 is OK. 38657+2**14 = 55041.
Script to produce these tables live in /opt/rtcds/caltech/c1/Git/40m/scripts/SUS/suspension_epics_check.py

Current coil dewhitening filter situations:

Next:
 - Investigate 60 Hz noise in laser frequency and check 28 Hz ELP situation for MC1,MC2,MC3
 - Fix ETMX acromag

While aligning today I realized the cavAlign step sizes and step factors had not been updated after the upgrade.

Here are the new MEDM command arguments to launch cavAlign. Only factors not equal to 1 are listed. The updates made by me are in red

Interesting notes:

[Rana, Radhika, Murtaza]

WFS Loop Debugging

- We turned on the WFS loops with very small gain (0.01) to see how the error signals behave. There is an existing template to look at the error signals in ndscope (users->Templates->ndscope->IOO->WFS->WFS-overview.yml). We observed C1:IOO-WFS2_IY_DQ stay at a constant offset as we increased the gain to 1.

- The output matrix for WFS (C1IOO_WFS_INMATRIX) was restored to the original value using burtgooey to mitigate the WFSoutMatBalancing.py change 17874.

- (TODO) WFS1 and WFS2 are slightly misaligned as seen on the C1IOO_LOCKMC screen. These need to be aligned when the IFO is unlocked so that the beam is centered on them.

- (TODO) With the PSL shutter turned off, WFS heads should show 0 reading which is not the case. This needs to be corrected for to mitigate the offset readings.

- The electronics upgrade should ideally only affect the suspensions (everything upstream should not need any changes).

- Note: The MC_TRANS error signals look very small in PIT and YAW.

[Rana, Vittoria]

At 3 pm, we did some PMC alignment, and the transmission value went from 665 to 680.

Also, we aligned the reflected beam.

Now the unlocked value the reflected photodiode sees is ~440 mV, and when it's locked, it sees ~21 mV. Before doing the alignment, the unlocked value was ~400 mV.

I pulled out the YEND acromag chassis to check how a connection is made. I unplugged it and then opened it without removing any front panel connections, and then I proceeded to wire the XEND acromag chassis at the electronics bench. After the work was done, I pushed it back but I couldn't restart modbusIOC, even after running daemon-reload on c1auxey1. The ETMY watchdogs are down for now, as are the vertex and XEND ones. I tried restarting c1auxey1 but this didn't help, so maybe something was wrong when mounting the NFS? I will continue this restoration tomorrow and then replicate this at the XEND.