Dripta & I went down to EY with PS4 to do a standard ES measurement following T1500016-v19. Using the new es-measure script to fetch the GPS times and write them to config.py in real time was simple and worked well. Thank you Miriam for your work on this.
PCAL beams status:
I took pictures of the Beam spot on the RX sphere before we touched anything. The beam spot looks well centered but enlongated in the vertical.
Generating measurement data:
python generate_measurement_data.py --WS PS4 --date 2025-09-22
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2025-09-22 corrected to ES temperature 299.6 K :
-4.700378053418811 -0.0002694340454223 2.9106526570958727e-05
Copying the scripts into tD directory...
Connected to nds.ligo-wa.caltech.edu
martel run
reading data at start_time: 1442680123
reading data at start_time: 1442680556
reading data at start_time: 1442680888
reading data at start_time: 1442681222
reading data at start_time: 1442681647
reading data at start_time: 1442682007
reading data at start_time: 1442682196
reading data at start_time: 1442682767
reading data at start_time: 1442683111
Ratios: -0.5345899840068289 -0.5432499955076983
writing nds2 data to files
finishing writing
Background Values:
bg1 = 18.446477; Background of TX when WS is at TX
bg2 = 4.880811; Background of WS when WS is at TX
bg3 = 18.451540; Background of TX when WS is at RX
bg4 = 4.973802; Background of WS when WS is at RX
bg5 = 18.448515; Background of TX
bg6 = -0.547938; Background of RX
The uncertainty reported below are Relative Standard Deviation in percent
Intermediate Ratios
RatioWS_TX_it = -0.534590;
RatioWS_TX_ot = -0.543250;
RatioWS_TX_ir = -0.526799;
RatioWS_TX_or = -0.534601;
RatioWS_TX_it_unc = 0.056427;
RatioWS_TX_ot_unc = 0.050625;
RatioWS_TX_ir_unc = 0.054770;
RatioWS_TX_or_unc = 0.060578;
Optical Efficiency
OE_Inner_beam = 0.985385;
OE_Outer_beam = 0.983858;
Weighted_Optical_Efficiency = 0.984621;
OE_Inner_beam_unc = 0.042178;
OE_Outer_beam_unc = 0.043242;
Weighted_Optical_Efficiency_unc = 0.060406;
Martel Voltage fit:
Gradient = 1637.943418;
Intercept = 0.261280;
Power Imbalance = 0.984059;
Endstation Power sensors to WS ratios::
Ratio_WS_TX = -0.927782;
Ratio_WS_RX = -1.382883;
Ratio_WS_TX_unc = 0.043998;
Ratio_WS_RX_unc = 0.042386;
=============================================================
============= Values for Force Coefficients =================
=============================================================
Key Pcal Values :
GS = -5.135100; Gold Standard Value in (V/W)
WS = -4.700378; Working Standard Value
costheta = 0.988362; Angle of incidence
c = 299792458.000000; Speed of Light
End Station Values :
TXWS = -0.927782; Tx to WS Rel responsivity (V/V)
sigma_TXWS = 0.000408; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS = -1.382883; Rx to WS Rel responsivity (V/V)
sigma_RXWS = 0.000586; Uncertainity of Rx to WS Rel responsivity (V/V)
e = 0.984621; Optical Efficiency
sigma_e = 0.000595; Uncertainity in Optical Efficiency
Martel Voltage fit :
Martel_gradient = 1637.943418; Martel to output channel (C/V)
Martel_intercept = 0.261280; Intercept of fit of Martel to output (C/V)
Power Loss Apportion :
beta = 0.998844; Ratio between input and output (Beta)
E_T = 0.991707; TX Optical efficiency
sigma_E_T = 0.000300; Uncertainity in TX Optical efficiency
E_R = 0.992855; RX Optical Efficiency
sigma_E_R = 0.000300; Uncertainity in RX Optical efficiency
Force Coefficients :
FC_TxPD = 9.154426e-13; TxPD Force Coefficient
FC_RxPD = 6.237665e-13; RxPD Force Coefficient
sigma_FC_TxPD = 4.917409e-16; TxPD Force Coefficient
sigma_FC_RxPD = 3.268808e-16; RxPD Force Coefficient
data written to ../../measurements/LHO_EndY/tD20250923/
Martel_Voltage_test.png
WS_at_TX.png
WS_at_RX.png
WS_at_RX_BOTH_BEAMS.png
Analysis:
Generated the LHO_EndY_PD_ReportV5.pdf with out issue.
Rho_R Prime[page 13] seems to be near 5 hops of the statistical uncertainty.
