DriptaB, FranciscoL, TonyS
Measurement summary:
Resumed routine end station measurement post O4c comissionning break. Procedure following
T1500062 went smoothly. The beams as found are shown in the
first attached image, were both pcal beams are shown in the IR card. The beam target was placed to have a reference of the "center" of the input aperture. The
second attached image shows both pcal beams after the measurement procedure, showing no change in alignment. Forgot to use target and was under a time crunch to finish procedure.
Results are nominal -- there are no outliers found on the plotted trends. We thus conclude, from the reported measurement, no need to update EPICS values for PCAL X "Force coeff. calculation".
Terminal output from data analysis script:
$python3 generate_measurement_data.py --WS PS4 --date 2025-06-24
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2025-06-24 corrected to ES temperature 299.2 K :
-4.70052522573445 -0.0002694340454223 2.66508565972755e-05
Copying the scripts into tD directory...
Connected to nds.ligo-wa.caltech.edu
martel run
reading data at start_time: 1435423390
reading data at start_time: 1435423770
reading data at start_time: 1435424085
reading data at start_time: 1435424665
reading data at start_time: 1435425020
reading data at start_time: 1435425335
reading data at start_time: 1435425435
reading data at start_time: 1435426070
reading data at start_time: 1435426405
Ratios: -0.46199911560110457 -0.4661225769446798
writing nds2 data to files
finishing writing
Background Values:
bg1 = 9.235188; Background of TX when WS is at TX
bg2 = 5.284960; Background of WS when WS is at TX
bg3 = 9.145166; Background of TX when WS is at RX
bg4 = 5.413446; Background of WS when WS is at RX
bg5 = 9.219525; Background of TX
bg6 = 0.642557; Background of RX
The uncertainty reported below are Relative Standard Deviation in percent
Intermediate Ratios
RatioWS_TX_it = -0.461999;
RatioWS_TX_ot = -0.466123;
RatioWS_TX_ir = -0.455904;
RatioWS_TX_or = -0.461457;
RatioWS_TX_it_unc = 0.092717;
RatioWS_TX_ot_unc = 0.098001;
RatioWS_TX_ir_unc = 0.097458;
RatioWS_TX_or_unc = 0.092076;
Optical Efficiency
OE_Inner_beam = 0.986610;
OE_Outer_beam = 0.990080;
Weighted_Optical_Efficiency = 0.988345;
OE_Inner_beam_unc = 0.062698;
OE_Outer_beam_unc = 0.063147;
Weighted_Optical_Efficiency_unc = 0.088986;
Martel Voltage fit:
Gradient = 1636.767545;
Intercept = 0.229197;
Power Imbalance = 0.991154;
Endstation Power sensors to WS ratios::
Ratio_WS_TX = -1.077445;
Ratio_WS_RX = -1.391120;
Ratio_WS_TX_unc = 0.058121;
Ratio_WS_RX_unc = 0.042422;
=============================================================
============= Values for Force Coefficients =================
=============================================================
Key Pcal Values :
GS = -5.135100; Gold Standard Value in (V/W)
WS = -4.700525; Working Standard Value
costheta = 0.988362; Angle of incidence
c = 299792458.000000; Speed of Light
End Station Values :
TXWS = -1.077445; Tx to WS Rel responsivity (V/V)
sigma_TXWS = 0.000626; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS = -1.391120; Rx to WS Rel responsivity (V/V)
sigma_RXWS = 0.000590; Uncertainity of Rx to WS Rel responsivity (V/V)
e = 0.988345; Optical Efficiency
sigma_e = 0.000879; Uncertainity in Optical Efficiency
Martel Voltage fit :
Martel_gradient = 1636.767545; Martel to output channel (C/V)
Martel_intercept = 0.229197; Intercept of fit of Martel to output (C/V)
Power Loss Apportion :
beta = 0.998895; Ratio between input and output (Beta)
E_T = 0.993606; TX Optical efficiency
sigma_E_T = 0.000442; Uncertainity in TX Optical efficiency
E_R = 0.994705; RX Optical Efficiency
sigma_E_R = 0.000443; Uncertainity in RX Optical efficiency
Force Coefficients :
FC_TxPD = 7.903342e-13; TxPD Force Coefficient
FC_RxPD = 6.193451e-13; RxPD Force Coefficient
sigma_FC_TxPD = 5.805084e-16; TxPD Force Coefficient
sigma_FC_RxPD = 3.826232e-16; RxPD Force Coefficient
data written to ../../measurements/LHO_EndX/tD20250701/
