louis.dartez@LIGO.ORG - posted 17:00, Monday 07 August 2023 - last comment - 12:08, Thursday 10 August 2023(72043)
3.2 kHz HF pole filter module restored in CAL-CS ETMX L3 bank
Taking advantage of the fact that we're not locked, I put the missing ETMX "HFPole" filter module (LHO:72030) back in theH1CAL-CS_DARM_ANALOG_ETMX_L3filterbank. From inspecting the filter archive, it looks like the "HFpole" ETMX filter module was removed on 4/25/2023. This is around the time we were rolling out the cmd-dev infrastructure for the calibration group. The plan is to follow up with a Broadband measurement later tonight or at the earlier opportunity to establish whether or not to keep this filter in place. The zpk string I used iszpk([], [3226.75],1,"n"). The value3226.75was calculated by summing the poles for all four ESD quadrants from LHO:46773 as per LHO:27150. I've attached screenshots of the ETMX filterbank and the GDS TP window. GDS table diff324c324 < # DESIGN CS_DARM_ANALOG_ETMX_L3 2 zpk([],[3226.75],1,"n") --- > # DESIGN CS_DARM_ANALOG_ETMX_L3 2 zpk([],[],9.787382864894167e-13,"n") 343c343 < CS_DARM_ANALOG_ETMX_L3 2 21 1 0 0 HFPole 4.158812836234200838170239e-01 -0.1682374327531596 0.0000000000000000 1.0000000000000000 0.0000000000000000 --- > CS_DARM_ANALOG_ETMX_L3 2 21 1 0 0 TEST_Npct_50W 9.787382864894166725851836e-13 0.0000000000000000 0.0000000000000000 0.0000000000000000 0.0000000000000000
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The above aLOG covers another *solution* top the on-going studies about the ~5-10% systematic error in the calibration -- namely, what's unique to LHO and *left over* after the flaw in GDS filters that was fixed in LHO:71787. The filter was loaded by 2023-08-07 17:15 UTC.
This change has been added to the LHO record of calibration pipeline changes for O4, DCC:T2300297
Correction to the timing of this filter update -- The filter was loaded by 2023-08-07 17:15 PDT -- i.e. 2023-08-08 00:15 UTC