Corey Chu, Ryan C and I went to the EndX station today and did a standard End Station measurement following T1500062-v21 this Tuesday.
The only thing that seems to be kind of peciluar is that the PCAL Laser Power supply had a strange Limit light that was lit up during the entire duration of the ES measurement.
After the measurement I keyed OFF the Laser enable and keyed it back on. The limit LED was then gone. Myabe this is from the power outage back on July 15th.
Also I had to change a line in generate_measurement_data.py to get it to run. specifically line 192: conn = nds2.connection(server, 31200) # 8088)
to: conn = nds2.connection(server,8088) # 31200)
This was because "Yesterday the trend files weren't mounted on the NDS server"
I have since reverted the change and pushed the correct lines back up the the PCAL repo on the master branch so it should still work for LLO.
Obligitory before Beam Spot pic: Beams look centered.
Scripts ran @cdsws32:
python generate_measurement_data.py --WS PS4 --date 2026-07-16
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2026-07-16 corrected to ES temperature 299.3 K :
-4.699027391114544 -0.0002694340454223 0.000750622815531554
Copying the scripts into tD directory...
Connected to h1daqnds1
martel run
reading data at start_time: 1468690400
reading data at start_time: 1468690930
reading data at start_time: 1468691270
reading data at start_time: 1468691940
reading data at start_time: 1468692480
reading data at start_time: 1468692870
reading data at start_time: 1468693288
reading data at start_time: 1468694160
reading data at start_time: 1468694666
Ratios: -0.46162600451541763 -0.4661255070734819
writing nds2 data to files
finishing writing
Background Values:
bg1 = 9.407246; Background of TX when WS is at TX
bg2 = 4.744478; Background of WS when WS is at TX
bg3 = 9.437291; Background of TX when WS is at RX
bg4 = 4.772117; Background of WS when WS is at RX
bg5 = 9.378150; Background of TX
bg6 = 0.491299; Background of RX
The uncertainty reported below are Relative Standard Deviation in percent
Intermediate Ratios
RatioWS_TX_it = -0.461626;
RatioWS_TX_ot = -0.466126;
RatioWS_TX_ir = -0.456059;
RatioWS_TX_or = -0.460920;
RatioWS_TX_it_unc = 0.071844;
RatioWS_TX_ot_unc = 0.070784;
RatioWS_TX_ir_unc = 0.080713;
RatioWS_TX_or_unc = 0.076349;
Optical Efficiency
OE_Inner_beam = 0.987790;
OE_Outer_beam = 0.988918;
Weighted_Optical_Efficiency = 0.988354;
OE_Inner_beam_unc = 0.053989;
OE_Outer_beam_unc = 0.054059;
Weighted_Optical_Efficiency_unc = 0.076402;
Martel Voltage fit:
Gradient = 1636.768024;
Intercept = 0.518413;
Power Imbalance = 0.990347;
Endstation Power sensors to WS ratios::
Ratio_WS_TX = -1.077875;
Ratio_WS_RX = -1.390900;
Ratio_WS_TX_unc = 0.043402;
Ratio_WS_RX_unc = 0.050017;
=============================================================
============= Values for Force Coefficients =================
=============================================================
Key Pcal Values :
GS = -5.135100; Gold Standard Value in (V/W)
WS = -4.699027; Working Standard Value
costheta = 0.988362; Angle of incidence
c = 299792458.000000; Speed of Light
End Station Values :
TXWS = -1.077875; Tx to WS Rel responsivity (V/V)
sigma_TXWS = 0.000468; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS = -1.390900; Rx to WS Rel responsivity (V/V)
sigma_RXWS = 0.000696; Uncertainity of Rx to WS Rel responsivity (V/V)
e = 0.988354; Optical Efficiency
sigma_e = 0.000755; Uncertainity in Optical Efficiency
Martel Voltage fit :
Martel_gradient = 1636.768024; Martel to output channel (C/V)
Martel_intercept = 0.518413; Intercept of fit of Martel to output (C/V)
Power Loss Apportion :
beta = 0.998895; Ratio between input and output (Beta)
E_T = 0.993611; TX Optical efficiency
sigma_E_T = 0.000380; Uncertainity in TX Optical efficiency
E_R = 0.994710; RX Optical Efficiency
sigma_E_R = 0.000380; Uncertainity in RX Optical efficiency
Force Coefficients :
FC_TxPD = 7.902743e-13; TxPD Force Coefficient
FC_RxPD = 6.196373e-13; RxPD Force Coefficient
sigma_FC_TxPD = 3.801143e-24; TxPD Force Coefficient
sigma_FC_RxPD = 3.152590e-24; RxPD Force Coefficient
data written to ../../measurements/LHO_EndX/tD20260721/
Obligitory After Beam Spot: Beam spots still look centered
Final Trends pdf: LHO_EndX_PD_ReportV6.pdf
