Reports until 15:45, Tuesday 23 May 2023
H1 CAL (CAL)
richard.savage@LIGO.ORG - posted 15:45, Tuesday 23 May 2023 - last comment - 19:02, Tuesday 23 May 2023(69856)
Erroneous EPICS parameter value in H1 Pcal X/Y comparison calculation found

As noted earlier (see this aLog entry) the Pcal X/Y comparison was giving nonsensical values.

I found that the demodulation oscillator freqency for the Pcal Xarm (H1:CAL-CS_TDEP_PCAL_X_COMPARE_COMPARISON_OSC_FREQ) had not been updated on May 5 when we changed line frequencies.

It has been updated to 283.91 now.

The change has been accepted and the value is now monitored in SDF.

The Yarm frequency is now monitored as well.

Comments related to this report
jeffrey.kissel@LIGO.ORG - 17:32, Tuesday 23 May 2023 (69863)CAL, OpsInfo
Link 

I've accepted what I believe are these changes in the PCALY OBSERVE.snap (we confirmed that there were no DIFFs in these channels in the safe.snap).
Images attached to this comment
richard.savage@LIGO.ORG - 19:02, Tuesday 23 May 2023 (69868)CAL
Link

Jeff B, DriptaB, RickS

After being alerted to this issue by JeffK, we restored the Pcal Yend EPICS variable values using the CAPUT commands from this file in the SVN:
/ligo/svncommon/CalSVN/aligocalibration/trunk/Projects/PhotonCalibrator/O4_EPICS_calibration/Pcal_LHO_CAPUTfile_O4run_2023-05-11.txt

caput H1:CAL-PCALY_FORCE_COEFF_RHO_T 7157.80
caput H1:CAL-PCALY_FORCE_COEFF_RHO_R 10652.5
caput H1:CAL-PCALY_FORCE_COEFF_TX_PD_ADC_BG 17.5161
caput H1:CAL-PCALY_FORCE_COEFF_RX_PD_ADC_BG -0.8150
caput H1:CAL-PCALY_FORCE_COEFF_TX_OPT_EFF_CORR 0.9920
caput H1:CAL-PCALY_FORCE_COEFF_RX_OPT_EFF_CORR 0.9931
caput H1:CAL-PCALY_XY_COMPARE_CORR_FACT 1.0015
The values were accepted in the SDF, for both the observe.snap and safe.snap files.