Caroline and I went to End X with PS4 and followed the instruction on the DCC doc T1500062.
The Current limit red LED was lit up again. I simply adjusted the voltage down a few thousandths of a volt and the current steadied right up at 10V again.
The beams were a little offset on the Apature of the RX Sphere when we arrived. But I did not touch up the alignment this time. I may touch up alignment again next months.
Also we wore gloves this time... that was fun I guess.
Commands ran & subsequent output:
anthony.sanchez@cdsws32: python generate_measurement_data.py --WS PS4 --date 2026-08-24
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2026-08-24 corrected to ES temperature 299.3 K :
-4.699251194624549 -0.0002694340454223 0.00075040881877916
Copying the scripts into tD directory...
Connected to h1daqnds1
martel run
reading data at start_time: 1471716950
reading data at start_time: 1471717444
reading data at start_time: 1471717888
reading data at start_time: 1471718420
reading data at start_time: 1471719060
reading data at start_time: 1471719400
reading data at start_time: 1471719630
reading data at start_time: 1471720300
reading data at start_time: 1471720660
Ratios: -0.4615405682485709 -0.46591058962067394
writing nds2 data to files
finishing writing
Background Values:
bg1 = 8.879049; Background of TX when WS is at TX
bg2 = 5.011307; Background of WS when WS is at TX
bg3 = 8.896423; Background of TX when WS is at RX
bg4 = 5.129760; Background of WS when WS is at RX
bg5 = 8.965872; Background of TX
bg6 = 0.027675; Background of RX
The uncertainty reported below are Relative Standard Deviation in percent
Intermediate Ratios
RatioWS_TX_it = -0.461541;
RatioWS_TX_ot = -0.465911;
RatioWS_TX_ir = -0.455518;
RatioWS_TX_or = -0.460890;
RatioWS_TX_it_unc = 0.070028;
RatioWS_TX_ot_unc = 0.067789;
RatioWS_TX_ir_unc = 0.072976;
RatioWS_TX_or_unc = 0.075331;
Optical Efficiency
OE_Inner_beam = 0.987476;
OE_Outer_beam = 0.989974;
Weighted_Optical_Efficiency = 0.988725;
OE_Inner_beam_unc = 0.046927;
OE_Outer_beam_unc = 0.047569;
Weighted_Optical_Efficiency_unc = 0.066821;
Martel Voltage fit:
Gradient = 1636.904156;
Intercept = 0.551415;
Power Imbalance = 0.990620;
Endstation Power sensors to WS ratios::
Ratio_WS_TX = -1.078224;
Ratio_WS_RX = -1.391522;
Ratio_WS_TX_unc = 0.041912;
Ratio_WS_RX_unc = 0.038391;
=============================================================
============= Values for Force Coefficients =================
=============================================================
Key Pcal Values :
GS = -5.135100; Gold Standard Value in (V/W)
WS = -4.699251; Working Standard Value
costheta = 0.988362; Angle of incidence
c = 299792458.000000; Speed of Light
End Station Values :
TXWS = -1.078224; Tx to WS Rel responsivity (V/V)
sigma_TXWS = 0.000452; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS = -1.391522; Rx to WS Rel responsivity (V/V)
sigma_RXWS = 0.000534; Uncertainity of Rx to WS Rel responsivity (V/V)
e = 0.988725; Optical Efficiency
sigma_e = 0.000661; Uncertainity in Optical Efficiency
Martel Voltage fit :
Martel_gradient = 1636.904156; Martel to output channel (C/V)
Martel_intercept = 0.551415; Intercept of fit of Martel to output (C/V)
Power Loss Apportion :
beta = 0.998895; Ratio between input and output (Beta)
E_T = 0.993797; TX Optical efficiency
sigma_E_T = 0.000332; Uncertainity in TX Optical efficiency
E_R = 0.994896; RX Optical Efficiency
sigma_E_R = 0.000332; Uncertainity in RX Optical efficiency
Force Coefficients :
FC_TxPD = 7.900632e-13; TxPD Force Coefficient
FC_RxPD = 6.191631e-13; RxPD Force Coefficient
sigma_FC_TxPD = 3.624112e-24; TxPD Force Coefficient
sigma_FC_RxPD = 2.753947e-24; RxPD Force Coefficient
data written to ../../measurements/LHO_EndX/tD20260825/ and can be found on the gitlab here.
