aLIGO LHO Logbook

H1 CAL

jeffrey.kissel@LIGO.ORG - posted 13:55, Thursday 23 January 2025 - last comment - 14:47, Thursday 23 January 2025(82417)

pydarm_H1.ini pyDARM DARM Loop Parameter File Updated to include Extra 65k to 16k Digital AA Filter, and IOPOMC0 Updated Filter File

J. Kissel, L. Dartez, E. Goetz

In process of updating the calibration after installing the extra AA 65k to 16k digital AA filter we turned on this morning (see 82404, 82412 and 82413), we've updated the "template" pyDARM DARM model parameter set that is the basis for all copies for every report against which the model is compared against measurement, and from which the calibration pipeline's model is derived.

The changes are relatively simple,
-omc_filter_noncompensating_modules = 9,10 : 9,10
+omc_filter_noncompensating_modules = 8,9,10 : 8,9,10

-omc_filter_file = Common/H1CalFilterArchive/h1iopomc0/H1IOPOMC0_1364929770.txt
+omc_filter_file = Common/H1CalFilterArchive/h1iopomc0/H1IOPOMC0_1421610658.txt
where the "-" lines are the "before" and the "+" lines are the "after."

Here's the location of the file, and the corresponding "before" vs. "after" git commit hash.

    /ligo/groups/cal/H1/ifo/pydarm_H1.ini
        Previous version f480b0a1
        Now new version 17649002

Comments related to this report

jeffrey.kissel@LIGO.ORG - 14:47, Thursday 23 January 2025 (82427)

Link

Also (somehow) remembered that another minor problem with the TST stage actuation path was the current CALCS replica of the L2L_DRIVEALIGN_GAIN. 
     H1:CAL-CS_DARM_FE_ETMX_L3_DRIVEALIGN_L2L_GAIN
needs to be the same the pydarm_H1.ini vs. what's in the front-end.

Changed the value from 191.712 to 184.65,
    - tst_drive_align_gain = 191.712
    + tst_drive_align_gain = 184.65

This is all changing the same file in the same location, but here's the next iteration's change.
    /ligo/groups/cal/H1/ifo/pydarm_H1.ini ccc02365

jeffrey.kissel@LIGO.ORG - 14:24, Thursday 23 January 2025 (82426)

Link

In addition to changing the parameter file for the extra OMC DCPD digital AA filtering, we decided to *also* push a somewhat long-standing issue with apparent delays in actuation functions. 

We're applying 23.0e-6 [sec] worth of delay to the model of the UIM stage, and more consequentially, 20.2e-6 worth of delay to the TST stage. Both numbers are informed by the fit to the actuation measurements we just took, see 20250123T211118Z.

The updated parameter set has been push to git with the following local location and mothership git hash.  
     /ligo/groups/cal/H1/ifo/pydarm_H1.ini 4d9eb345

The calibration we installed / pushed / exported today will have all three of these changes in play.