Control Room (Corey, Sheila, Elenna, Oli, Georgia, Craig, Julia, Matt, Keita, Ryan S, Camilla

Notes of what's been done so far today, we've spent the majority of the day locked at POWER_10W, adjusting the ASC sensing matrix and gains:

• After Initial Alignment, DRMI tends to lock on it's own after ~2minutes.
• Take ISC_LOCK in DRMI_LOCKED_CHECK_ASC and touch up SRM and PRM to increase RF18 (and decrease RF90.
  • ndscopes needed: LSC > LOCKING > ! Locking scopes > "Scopes: Buildups (slow)"
• [optional, only do if needed] Can pause at CARM_5_PICOMETERS if loosing lok at PREP_ASC_FOR_FULL_IFO and  then touch up SRM and PRM to increase RF18 (and decrease RF90).
• Then can go all the way to PREP_ASC_FOR_FULL_IFO. Stop here and move any ASC signals that are not on zero to zero. Maybe to move optics or use the usesrapps/../asc/h1/scripts/move_arm_dev.py script e.g. 'python3 move_ARM_dev.py CH P 0.01' for CHARD P. At the same time, watch that the RF90 stays low and RF18 and circulating power stays high. 
  • ndscopes needed: LSC > LOCKING > ! Locking scopes > "Scopes: Buildups (slow)" and "Scopes: ASC signals"
  • If error signals are saturated, turn off the soft limiters via the ASC screen e.g. H1:ASC-INP1_P_SMOOTH_ENABLE.
  • For this lock, we:
    • Touched SRM to improve SRC2
    • Turned off limiters IMP1 PIT YAW and touched IM4 to improve IMP1.
    • Touched PRM to improve PRC2
    • Used move arm dev script for CHARD e.g. python3 move_ARM_dev.py CH P 0.01 (zoom in to check if they are away from zero)
• Take ISC_LOCK in CHECK_VIOLINS_BEFORE_POWERUP
  • Today we needed to wait here while Rahul damped IY mode 6 84720
  • Elenna noticed that the gain in CHARD was ~ 30dB less than she remembered.
• Went to POWER_10W
  • Checked HWS data here
  • Elenna ran dither sensing matrix checks to make the phaser plots and designed ASC input sensing matrix for INP and CHARD 84726:
    • CHARD P: -1 A_RF45 + 0.6 B_RF45
    • CHARD Y: -1 A_RF45 + 0.8 B_RF45
    • INP1 P: 1.5 A_RF45 + 1 B_RF45
    • INP1 Y: 2 A_RF45 + 1  B_RF45
    • Sheila put these in the guardian
  • Georgia and Julia added offsets into the ASC loops to check the sensing of them 84724.
  • Sheila checked Elenna's suggested matrix made sense with Georgia's phase change measurements.
  • During this time at 10W, the circulating power / LSC-REFL_A started oscillating at 0.02Hz, Craig remembered they found this yesterday (84702) was due to the ADS PIT 4 and 5 loops. We turned these off and oscillation stopped, plot attached. We expect they are just over-compensating for the CHARD gain being too low.
  • Keita, Craig and I slowly turned on the matrix one at a time; INP1 Y, P, CHARD Y, P. By turning off gain, putting new matrix in, for INP1 we then brought error signal to zero by stepping IM4 and slowly brought the gains back to nominal.
  • Matt and Keita then ran CHARD_P_olg_shaped_exc.xml. When Elenna ran this while we were at 2W in, the gain was -30dB, now it's at -15dB.
  • Sheila, Julia and I turned H1:ASC-CHARD_P_GAIN up from 20 to 80 (+12dB) while watching the ASC output and input signals stayed fine, and then Elenna and Keita reran the CHARD_P_olg, found it was close to 0dB, leaving gain here.
  • Elenna and Keita ran CHARD_Y_olg_shaped_exc.xml, it started at -20dB, they raised the H1:ASC-CHARD_Y_GAIN up from 3 to 10, 30, and 300 we started seeing that CHARDY and/or INP1Y were now unstable buzzing around 0.8Hz, took back to 3. Even with gain of 10 the buzzing came back.
  • We turned ADS PIT 4 and 5 loops back on, hoping that with the CHARD P gain increase it would be fine now.