RickS, FranciscoL, TonyS, JoeB, Dripta.
On Saturday, Sept. 21, 2024, the Pcal force coefficient EPICS record values were updated.
At X-end:
Old : H1:CAL-PCALX_FORCE_COEFF_RHO_T 8305.09
New : H1:CAL-PCALX_FORCE_COEFF_RHO_T 8300
Old : H1:CAL-PCALX_FORCE_COEFF_RHO_R 10716.6
New : H1:CAL-PCALX_FORCE_COEFF_RHO_R 10713.3
Old : H1:CAL-PCALX_FORCE_COEFF_TX_PD_ADC_BG 9.6571
New : H1:CAL-PCALX_FORCE_COEFF_TX_PD_ADC_BG 8.81815
Old : H1:CAL-PCALX_FORCE_COEFF_RX_PD_ADC_BG 0.7136
New : H1:CAL-PCALX_FORCE_COEFF_RX_PD_ADC_BG 0.56678
Old : H1:CAL-PCALX_FORCE_COEFF_TX_OPT_EFF_CORR 0.9938
New : H1:CAL-PCALX_FORCE_COEFF_TX_OPT_EFF_CORR 0.99331
Old : H1:CAL-PCALX_FORCE_COEFF_RX_OPT_EFF_CORR 0.9948
New : H1:CAL-PCALX_FORCE_COEFF_RX_OPT_EFF_CORR 0.9944
Old : H1:CAL-PCALX_XY_COMPARE_CORR_FACT 0.9991
New : H1:CAL-PCALX_XY_COMPARE_CORR_FACT 0.99855
At Y-End:
Old : H1:CAL-PCALY_FORCE_COEFF_RHO_T 7145.62
New : H1:CAL-PCALY_FORCE_COEFF_RHO_T 7155.15
Old : H1:CAL-PCALY_FORCE_COEFF_RHO_R 10649.6
New : H1:CAL-PCALY_FORCE_COEFF_RHO_R 10663.6
Old : H1:CAL-PCALY_FORCE_COEFF_TX_PD_ADC_BG 18.2388
New : H1:CAL-PCALY_FORCE_COEFF_TX_PD_ADC_BG 18.3088
Old : H1:CAL-PCALY_FORCE_COEFF_RX_PD_ADC_BG -0.2591
New : H1:CAL-PCALY_FORCE_COEFF_RX_PD_ADC_BG -0.7353
Old : H1:CAL-PCALY_FORCE_COEFF_TX_OPT_EFF_CORR 0.9923
New : H1:CAL-PCALY_FORCE_COEFF_TX_OPT_EFF_CORR 0.99191
Old : H1:CAL-PCALY_FORCE_COEFF_RX_OPT_EFF_CORR 0.9934
New : H1:CAL-PCALY_FORCE_COEFF_RX_OPT_EFF_CORR 0.9931
Old : H1:CAL-PCALY_XY_COMPARE_CORR_FACT 1.0005
New : H1:CAL-PCALY_XY_COMPARE_CORR_FACT 1.00092
The caput commands used for updating the ePICS records can be found here: https://git.ligo.org/Calibration/pcal/-/blob/master/O4/EPICS/results/CAPUT/Pcal_H1_CAPUTfile_O4brun_2024-09-16.txt?ref_type=heads
SDF diff has been accepted.
It has been roughly 4 months since the last update on May 2024. We plan to update the EPICS reords regularly, since over the course of a year , we observed that the Rx sensor calibration exhibits a systematic variation by as much as +/- 0.25 % at LHO. End station measurements allow us to monitor this systematic change over time. We will monitor the X/Y comparison factor to see if these EPICS changes had any significant effect on it. If the update is done correctly, there should be no significant change in the X/Y calibration comparison factor. If we find that there is a signifricant change in it, then we will correct the ePICS records accordingly.
Attached .pdf file shows the Rx calibration (ct/W) trend at LHOX and LHOY end for the entire O4 run. It marks the measurements used to calculate the Pcal force coefficients EPICS record values for the previous update at the start of the O4b run as well as the current update.
The pngs are the screenshots of the MEDM screen after the EPICS update.
