Dr. Dripta B. and I went to EX today to do a PCAL End Station measurement with PS4 using the  T1500062 ES Power Sensor RR Meas : Procedures & Log.
I took a picture of the beam spots before we started, and after we were done. 
We ran Miriam's fantastic shell tool & left her some feed back written in the margins of the 2.2 section of the T1500062 Proc & Log document linked above.

We tried to run the measurement right at the end station but we didn't know that NDS servers were having a problem this week.
I eventually changed the server to be h1daqnds1 port 8088 to get the data instead.
       
Command Ran:
python generate_measurement_data.py --WS PS4 --date 2025-11-03
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2025-11-03 corrected to ES temperature 299.5 K :
-4.7017855975867215 -0.0002694340454223 2.686163396659873e-05
Copying the scripts into tD directory...
Connected to h1daqnds1
martel run
reading data at start_time:  1446313243
reading data at start_time:  1446313659
reading data at start_time:  1446313992
reading data at start_time:  1446314497
reading data at start_time:  1446314910
reading data at start_time:  1446315256
reading data at start_time:  1446315430
reading data at start_time:  1446316080
reading data at start_time:  1446316490
Ratios: -0.46104301054554775 -0.4663040860974578
writing nds2 data to files
finishing writing
Background Values:
bg1 =        9.224674; Background of TX when WS is at TX
bg2 =        4.512480; Background of WS when WS is at TX
bg3 =        9.191238; Background of TX when WS is at RX
bg4 =        4.365167; Background of WS when WS is at RX
bg5 =        9.279967; Background of TX
bg6 =        0.429854; Background of RX

The uncertainty reported below are Relative Standard Deviation in percent 

Intermediate Ratios
RatioWS_TX_it      = -0.461043;
RatioWS_TX_ot      = -0.466304;
RatioWS_TX_ir      = -0.455583;
RatioWS_TX_or      = -0.461207;
RatioWS_TX_it_unc  = 0.084627;
RatioWS_TX_ot_unc  = 0.080522;
RatioWS_TX_ir_unc  = 0.093808;
RatioWS_TX_or_unc  = 0.083107;
Optical Efficiency
OE_Inner_beam                      = 0.988311;
OE_Outer_beam                      = 0.989318;
Weighted_Optical_Efficiency        = 0.988814;

OE_Inner_beam_unc                  = 0.058828;
OE_Outer_beam_unc                  = 0.054324;
Weighted_Optical_Efficiency_unc    = 0.080074;

Martel Voltage fit:
Gradient      = 1637.051728;
Intercept     = 0.515075;

 Power Imbalance = 0.988718;

Endstation Power sensors to WS ratios::
Ratio_WS_TX                        = -1.078345;
Ratio_WS_RX                        = -1.392858;

Ratio_WS_TX_unc                    = 0.050215;
Ratio_WS_RX_unc                    = 0.044908;

=============================================================
============= Values for Force Coefficients =================
=============================================================

Key Pcal Values :
GS           =      -5.135100; Gold Standard Value in (V/W)             
WS           =      -4.701786; Working Standard Value             

costheta     =      0.988362; Angle of incidence
c            =      299792458.000000; Speed of Light
             
End Station Values : 
TXWS         =        -1.078345; Tx to WS Rel responsivity (V/V)
sigma_TXWS   =        0.000541; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS         =        -1.392858; Rx to WS Rel responsivity (V/V)
sigma_RXWS   =        0.000626; Uncertainity of Rx to WS Rel responsivity (V/V)

e            =        0.988814; Optical Efficiency
sigma_e      =        0.000792; Uncertainity in Optical Efficiency

Martel Voltage fit : 
Martel_gradient         =        1637.051728; Martel to output channel (C/V)
Martel_intercept   =        0.515075; Intercept of fit of     Martel to output (C/V)

Power Loss Apportion : 
beta          =        0.998895; Ratio between input and output (Beta)  
E_T          =        0.993842; TX Optical efficiency 
sigma_E_T          =        0.000398; Uncertainity in TX Optical efficiency 
E_R          =        0.994941; RX Optical Efficiency 
sigma_E_R          =        0.000398; Uncertainity in RX Optical efficiency 

Force Coefficients : 
FC_TxPD          =        7.895132e-13; TxPD Force Coefficient 
FC_RxPD          =        6.181524e-13; RxPD Force Coefficient 
sigma_FC_TxPD          =        5.093350e-16; TxPD Force Coefficient 
sigma_FC_RxPD          =        3.738196e-16; RxPD Force Coefficient 
data written to ../../measurements/LHO_EndX/tD20251104/

This produced the following plots:

Martel_Voltage_test.png
WS_at_TX.png
WS_at_RX.png
WS_at_RX_BOTH_BEAMS.png

Running the the Following command makes the Trends plots for the ES measurement:
python pcalPublishReportsV5.py LHO_EndX tD20251104

LHO_EndX_PD_ReportV5.pdf  

All of this can be found at the PCAL git lab repo.