Francisco, Tooba, and I went to EY today to do an End Y PCAL End Station measurement.
We followed the Procedure outlined in T1500062-v19.
Beamspot before we started
Ran the following script & the out put follows:
(pcal_env) anthony.sanchez@cdsws31: python generate_measurement_data.py --WS PS4 --date 2025-07-21
/ligo/gitcommon/Calibration/pcal/O4/ES/scripts/pcalEndstationPy/generate_measurement_data.py:52: SyntaxWarning: invalid escape sequence '\R'
log_entry = f"{current_time} {command} \Results found here\: {results_path}\n"
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2025-07-21 corrected to ES temperature 299.2 K :
-4.702207423037734 -0.0002694340454223 3.166921849830658e-05
Copying the scripts into tD directory...
Connected to nds.ligo-wa.caltech.edu
martel run
reading data at start_time: 1437237350
reading data at start_time: 1437237810
reading data at start_time: 1437238140
reading data at start_time: 1437238500
reading data at start_time: 1437238870
reading data at start_time: 1437239200
reading data at start_time: 1437239330
reading data at start_time: 1437240000
reading data at start_time: 1437240340
Ratios: -0.5346791724911457 -0.543267360018835
writing nds2 data to files
finishing writing
Background Values:
bg1 = 18.235622; Background of TX when WS is at TX
bg2 = 5.180516; Background of WS when WS is at TX
bg3 = 18.271548; Background of TX when WS is at RX
bg4 = 5.304736; Background of WS when WS is at RX
bg5 = 18.324199; Background of TX
bg6 = -0.468829; Background of RX
The uncertainty reported below are Relative Standard Deviation in percent
Intermediate Ratios
RatioWS_TX_it = -0.534679;
RatioWS_TX_ot = -0.543267;
RatioWS_TX_ir = -0.527180;
RatioWS_TX_or = -0.534309;
RatioWS_TX_it_unc = 0.063072;
RatioWS_TX_ot_unc = 0.066352;
RatioWS_TX_ir_unc = 0.058208;
RatioWS_TX_or_unc = 0.055534;
Optical Efficiency
OE_Inner_beam = 0.986071;
OE_Outer_beam = 0.983489;
Weighted_Optical_Efficiency = 0.984780;
OE_Inner_beam_unc = 0.047991;
OE_Outer_beam_unc = 0.047969;
Weighted_Optical_Efficiency_unc = 0.067854;
Martel Voltage fit:
Gradient = 1637.880346;
Intercept = 0.388593;
Power Imbalance = 0.984192;
Endstation Power sensors to WS ratios::
Ratio_WS_TX = -0.927690;
Ratio_WS_RX = -1.383303;
Ratio_WS_TX_unc = 0.053210;
Ratio_WS_RX_unc = 0.043963;
=============================================================
============= Values for Force Coefficients =================
=============================================================
Key Pcal Values :
GS = -5.135100; Gold Standard Value in (V/W)
WS = -4.702207; Working Standard Value
costheta = 0.988362; Angle of incidence
c = 299792458.000000; Speed of Light
End Station Values :
TXWS = -0.927690; Tx to WS Rel responsivity (V/V)
sigma_TXWS = 0.000494; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS = -1.383303; Rx to WS Rel responsivity (V/V)
sigma_RXWS = 0.000608; Uncertainity of Rx to WS Rel responsivity (V/V)
e = 0.984780; Optical Efficiency
sigma_e = 0.000668; Uncertainity in Optical Efficiency
Martel Voltage fit :
Martel_gradient = 1637.880346; Martel to output channel (C/V)
Martel_intercept = 0.388593; Intercept of fit of Martel to output (C/V)
Power Loss Apportion :
beta = 0.998844; Ratio between input and output (Beta)
E_T = 0.991787; TX Optical efficiency
sigma_E_T = 0.000336; Uncertainity in TX Optical efficiency
E_R = 0.992935; RX Optical Efficiency
sigma_E_R = 0.000337; Uncertainity in RX Optical efficiency
Force Coefficients :
FC_TxPD = 9.152859e-13; TxPD Force Coefficient
FC_RxPD = 6.233084e-13; RxPD Force Coefficient
sigma_FC_TxPD = 5.803098e-16; TxPD Force Coefficient
sigma_FC_RxPD = 3.482293e-16; RxPD Force Coefficient
data written to ../../measurements/LHO_EndY/tD20250722/
This produced:
Martel_Voltage_test.png
WS_at_TX.png
WS_at_RX.png
WS_at_RX_BOTH_BEAMS.png
These dont look unreasonable, so we ran the End station trends report script to give us the LHO_EndY_PD_ReportV5.pdf.
