J. Kissel, O. Patane, S. Dwyer, E. Capote

Given the assessment of from LHO:84585, and its comment LHO:84587, I've reduced the gain of the RM1 and RM2 damping loops by a factor of 1.4x and 1.7x, by multiplying the ''gain_[DOF]'' filters by 0.75x and 0.6x, respectively. We intend to remeasure the open loop gain TFs and loop-suppressed plant measurements as the opportunity arises between lock acquisitions.

Here's the diff of the filter file design string, which has been now committed to the userapps svn as of the following commit rev:
    /opt/rtcds/userapps/release/sus/h1/filterfiles$ svn diff H1SUSHTTS.txt | grep DESIGN | grep -B 1 +#
    -# DESIGN   RM1_M1_DAMP_L 3 gain(0.01)gain(70)
    +# DESIGN   RM1_M1_DAMP_L 3 gain(0.01)gain(70)gain(0.75)
    --
    -# DESIGN   RM1_M1_DAMP_P 3 gain(2e-05)gain(70)
    +# DESIGN   RM1_M1_DAMP_P 3 gain(2e-05)gain(70)gain(0.75)
    --
    -# DESIGN   RM1_M1_DAMP_Y 3 gain(5e-06)gain(70)
    +# DESIGN   RM1_M1_DAMP_Y 3 gain(5e-06)gain(70)gain(0.75)
    --
    -# DESIGN   RM2_M1_DAMP_L 3 gain(0.01)gain(70)
    +# DESIGN   RM2_M1_DAMP_L 3 gain(0.01)gain(70)gain(0.6)
    --
    -# DESIGN   RM2_M1_DAMP_P 3 gain(2e-05)gain(70)
    +# DESIGN   RM2_M1_DAMP_P 3 gain(2e-05)gain(70)gain(0.6)
    --
    -# DESIGN   RM2_M1_DAMP_Y 3 gain(5e-06)gain(70)
    +# DESIGN   RM2_M1_DAMP_Y 3 gain(5e-06)gain(70)gain(0.6)
    /opt/rtcds/userapps/release/sus/h1/filterfiles$ svn commit -m "Adjusted RM damping loop gain to account for increase in plant TF magnitude after Apr-Jun 2025 vent. See LHO aLOGs 84585, 84587, and 84590." H1SUSHTTS.txt 
    Sending        H1SUSHTTS.txt
    Transmitting file data .done
    Committing transaction...
    Committed revision 31533.

I then
- turned OFF the damping loops' output switch,
- loaded the coefficients
- turned ON the damping loops' output switch.
all while the DC centering loop alignment integrator's DAC request was still in place. That DAC request was in the 100s of Euler Basis DAC counts (the outputs of the LOCK banks), and the damping loops' DAC request was in the 1s of Euler basis DAC counts (the outputs of the DAMP banks). The damping loops request a trivial amount of DAC range.