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Reports until 12:32, Friday 31 March 2023
H1 CAL
louis.dartez@LIGO.ORG - posted 12:32, Friday 31 March 2023 - last comment - 14:19, Friday 07 April 2023(68319)
updated calibration, fixed sign error in L3 path
L. Dartez, J. Kissel

We updated the calibration to account for a missed negative sign in H1CAL-CS_DARM_ANALOG_ETMX_L3 FM5 (biassign) when I was trying to synchronize the ETMX L2 DriveAlign CAL-CS and SUS models.  Correcting for the extra negative bias sign results in the red trace in the attached  PCALY2DARM broadband plot . The blue trace is a reference that we took before changing anything with the same settings as I left them in LHO 68306. We're now near unity around 100 Hz and at the 2% level down to 20 Hz. 

Our list of changes is as follows: 
- H1:CAL-CS_DARM_ANALOG_ETMX_L1
    Switch FM7 OFF
    Switch FM4 ON

- H1:CAL-CS_DARM_ANALOG_ETMX_L2
    Switch FM7 OFF
    Switch FM4 ON

- H1:CAL-CS_DARM_ANALOG_ETMX_L3
    Switch FM3 ON
    Switch FM5 and FM7 OFF
- Change H1:CAL-CS_DARM_FE_ETMX_L3_DRIVEALIGN_L2L_GAIN from -35.7 to 184.65
- Change H1:CAL-CS_DARM_FE_ETMX_L3_LOCK_INBIAS from -9.3 to 3.3
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Comments related to this report
louis.dartez@LIGO.ORG - 12:47, Friday 31 March 2023 (68321)
TDCF's still cannot be trusted.
jeffrey.kissel@LIGO.ORG - 14:19, Friday 07 April 2023 (68507)
Since we've successfully running with the following primary path gain settings for a week, (pulled from the report which informed the sensing and actuation gain values and the cavity pole, LHO:68306)

    coupled_cavity_optical_gain   = 3.337e+06 # [ct/m] (in foton, [the inverse of] this optical gain is written precision at 2.997128735365323e-07 [m/ct])
    coupled_cavity_pole_frequency = 441.18    # [Hz]  (in foton, this is written with obscene precision at 441.1789008537899 [Hz])

    # UIM = 1.61      ==> 7.559e-08 (N/ct)     in foton, 7.559040716133722e-08
    # PUM = 0.03059   ==> 6.266e-10 (N/ct)    in foton, 6.266450556381686e-10
    # TST = 2.583e-11 ==> 9.787e-13 (N/ct)    in foton, 9.787382864894167e-13
    uim_NpA       = 1.6100
    pum_NpA       = 0.03059
    tst_NpV2      = 2.583e-11 # Lower than usual because of reduced bias voltage, LHO:67698 

So, in the continued process of updating the pydarm parameter file, we need to export the frequency response of the inverse sensing function as calculated by CAL-CS / foton. As per instructions found in LHO:47948, I've exported the foton-computed transfer function of the design string
    FM1    "TEST_50W_NoD2N"     zpk([441.1789008537899],[7000],0.9999999999999997,"n")
    
to the following location:
    /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/Foton/
        2023-04-07_H1CALCS_InverseSensingFunction_Foton_TEST_50W_NoD2N_tf.txt
and committed it there.
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