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MIF (ASC)
tatsuki.washimi - 13:01 Thursday 22 January 2026 (36194) Print this report
POP/REFL WFS Amplitude with 13.125 Hz Injection on IMMT2/PR3/BS

I measured the spectrum ratio (TF Magnitude) of REFL 17/45 QPD1/2 PIT/YAW and POP 17 QPD1/2 PIT/YAW signals with 13.125 Hz Injection on IMMT2/PR3/BS.

  • Gurdian State: INCREASE_SOFTHARD_GAIN
  • "resG_measure" (FM4) for the LSC DARM2/MICH1/PRCL1 were turned on manually
  • Referrence:  2025-10-24 (klog35408)


Following tables are the rough summary of the measured data in dB (original data can be found at /users/Commissioning/data/ASC/2026/0122/).
The values in ( ) are the previous results.

PIT REFL_QPDA2_RF17_I REFL_QPDA1_RF45_I POP QPDA1_RF17_Q
IMMT2 50 (48) 19 (20) -10 (-53)
PR3 44 (41) 45 (61) 16 (-1)
BS 37 (36) 30 (46) 8 (11)

 

YAW REFL_QPDA2_RF17_I REFL_QPDA1_RF45_I POP QPDA1_RF17_Q
IMMT2 52 (52) 9 (27) -6 (24)
PR3 38 (29) 47 (59) 17 (2)
BS 27 (33) 40 (53) 14 (16)
Images attached to this report
Comments to this report:
dan.chen - 6:33 Friday 23 January 2026 (36200) Print this report

For P

PIT REFL_QPDA1_RF17_I REFL_QPDA1_RF17_Q REFL_QPDA2_RF17_I REFL_QPDA2_RF17_Q REFL_QPDA1_RF45_I REFL_QPDA1_RF45_Q REFL_QPDA2_RF45_I REFL_QPDA2_RF45_Q
IMMT2 39 16 50 (48) 6 19 (20) 36 38 45
PR3 39 23 44 (41) 17 45 (61) 27 56 53
BS 23 20 37 (36) 23 30 (46) 24 44 39
PIT POP_QPDA1_RF17_I POP_QPDA1_RF17_Q POP_QPDA2_RF17_I POP_QPDA2_RF17_Q POP_QPDA1_RF45_I POP_QPDA1_RF45_Q POP_QPDA2_RF45_I POP_QPDA2_RF45_Q
IMMT2 -18 -10 (-53) -16 -10 -17 -20 -25 -26
PR3 15 16 (-1) 16 16 34 28 24 25
BS 7 8 (11) 9 9 23 16 17 16
dan.chen - 9:03 Friday 23 January 2026 (36203) Print this report

Phase (deg) for P

PIT REFL_QPDA1_RF17_I REFL_QPDA1_RF17_Q REFL_QPDA2_RF17_I REFL_QPDA2_RF17_Q REFL_QPDA1_RF45_I REFL_QPDA1_RF45_Q REFL_QPDA2_RF45_I REFL_QPDA2_RF45_Q
IMMT2 26 24 -155 31 26 25 -155 -155
PR3 -126 13 57 -152 -125 51 55 -125
BS -135 -100 54 -127 -129 59 54 -126
PIT POP_QPDA1_RF17_I POP_QPDA1_RF17_Q POP_QPDA2_RF17_I POP_QPDA2_RF17_Q POP_QPDA1_RF45_I POP_QPDA1_RF45_Q POP_QPDA2_RF45_I POP_QPDA2_RF45_Q
IMMT2 -86 -161 -109 -166        
PR3 -92 -138 -101 -146        
BS -108 77 -116 81        
takaaki.yokozawa - 10:59 Friday 23 January 2026 (36199) Print this report

I added more information from Washimi-san's result
REFL_QPDA{1,2}_RF17_{I,Q}

  QPDA1 I QPDA1 Q QPDA2 I QPDA2 Q
IMMT2 43 (44) 25deg 17 (1) 12 deg 52 (52) -155deg 14 (21) 30 deg
PR3 40  (28) 49 deg 31 (20) 2 deg 38 (29) 72 deg 27 (13) -180 deg
BS 38 (15)-131 deg 29 (30) 87 deg 27 (31) -77 deg 13 (37) -53 deg

 
REFL_QPDA{1,2}_RF45_{I,Q}

  QPDA1 I QPDA1 Q QPDA2 I QPDA2 Q
IMMT2 9 (27) 30deg 40 (38) 25 deg 39 (41) -155 deg 47 (45) -155 deg
PR3 47 (59) 54 deg 46 (39) -127 deg 53 (42) 53 deg 48 (46) -127 deg
BS 40 (53) -125 deg 27 (40) 52 deg 47 (41) -127 deg 44 (42)  54 deg

 
POP_QPDA{1,2}_RF17_{I,Q}

  QPDA1 I QPDA1 Q QPDA2 I QPDA2 Q
IMMT2 -8 (-12) -164 deg -6 (-24) 169 deg -9 (-8) 124 deg -14 (-26) 7.5 deg
PR3 19 (10)-131deg 17 (2)-167 deg 15 (28)97 deg 10 (-13)42 deg
BS 17 (5) 45 deg 14 (16) -88 deg 11 (9) -52 deg 11 (15) 75 deg

 

For IMMT2 ASC control, REFL QPD2 RF17 I with -52 dB(-0.0025)
For PR3 ASC control, REFL QPD1 RF 45 Q with - 46 dB (0.005)
For BS ASC control, the combination of the POP QPDA2 RF 17 I with -27 dB(-0.0450) and Q with -22 dB (0.0790)
 

dan.chen - 14:55 Friday 23 January 2026 (36210) Print this report

We selected the sensors for INP, PRC, MICH for P as follows:

  • INP: REFL 2 RF17 I
  • PRC: REFL 2 RF45 I
  • MICH: POP 2 RF17 I and Q

Then, we adjusted the INMTRX.
Attached figure shows the result. We used the 13.125Hz to measure the relations.

Images attached to this comment
takaaki.yokozawa - 8:35 Saturday 24 January 2026 (36213) Print this report
We selected the sensors for INP, PRC, MICH for Y as follows:
  • INP: REFL 2 RF17 I
  • PRC: REFL 1 RF45 I and Q
  • MICH: POP 1 RF17 I and Q
Then, we adjusted the INMTRX.
Attached figures shows the result. We used the 13.125Hz to measure the relations.

And I turned off the ASC-PRCL1_P INPUT and Turned on the ASC-PRCL2_P INPUT, then
PRFPMI RF LOCKED state achieved.
Images attached to this comment
takaaki.yokozawa - 15:05 Saturday 24 January 2026 (36215) Print this report
I measured the OLTF for following loops.
Images attached to this comment
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