ENDY Station Measurement:
During the Tuesday maintenace, the PCAL team(Rick Savage & Tony Sanchez) went to ENDY with Working Standard Hanford aka WSH(PS4) and took an End station measurement.
The ENDY Station Measurement was carried out according to this Modified version of the procedure outlined in Document LIGO-T1500062-v15, Pcal End Station Power Sensor Responsivity Ratio Measurements: Procedures and Log, and was completed by 11 am. The modification was just an extra background measurement with the covers on at the very end of the procedure.
First thing we did is take a picture of the beam spot before anything is touched!
Martel:
We started by setting up a Martel Voltage source to apply voltage into the PCAL Chassis's Input 1 channel and we record the times that a -4.000V, -2.000V and a 0.000V signal was sent to the Chassis. Martel_Voltage_Test.png graph. We also did a measurement of the Martel's voltages in the PCAL lab to calculate the ADC conversion factor, which is included on the document.
After the Martel measurement, we make a series of plots while the Working Standard(PS4) is in the Transmitter Module. These plots are shown in WS_at_TX.png.
Next steps include: The WS in the Receiver Module, These plots are shown in WS_at_RX.png.
Followed by TX_RX.png which are plots of the Transmitter module and the receiver module operation without the WS in the beam path at all.
The last picture is of the Beam spot after we had finished the measurement.
Special Notes: In the pcal_params.py
PCALPARAMS['WHG'] = 0.91536 # 12/05/2023
was changed to:
PCALPARAMS['WHG'] = 0.91616 # 01/10/2024
The updated "Local measurement" value for WHG is the average of two lab measurements taken specifically for the End Station measurement. A "FrontBack"(PS4 on the Front track) and a "BackFront" (PS4 on the Back track) of PS4_PS5 Responsivity ratios. They were measured on the day of the end station measurement Jan 9th 2024. This pcal_params.py For future reference, changing this number multiplys the entire series of measurements for the entire run by the new number.
The above change might have a slight impact on the RxPD calibration reported in LHO_EndY_PD_ReportV2.pdf.
All data and Analysis has been commited to the SVN.
https://svn.ligo.caltech.edu/svn/aligocalibration/trunk/Projects/PhotonCalibrator/measurements/LHO_EndY/tD20240109/
LAB Measurements Notes:
The PCAL Team has made a proceedural change that now requires the lab results to be processed before the End station results to allow for what we are now calling a "Local in time measurement" of the integrating sphere ratios.
The calculation I used to get this "Local measurement" is:
(BackFront_mean + FrontBack_mean)/2 . It's literally just an average of the last two lab measurements in "BF FB pairs".
This is the first time we have tried this change, but it allows us to treat these measurements more like a metrology shop would.
This is the number we measured today, thus we will use this number today baring any data aquisition or quality issues which will be addressed as they arrive.
BackFront configuration PS4/PS5 Responsivity Ratio.
PCAL Lab Responsivity Ratio Measurement:
A WSH/GSHL (PS4/PS5)BF Responsivity Ratio measurement was ran, analyzed, and pushed to the SVN.
The analysis of this measurement produces 4 PDF files which we use to vet the data for problems.
BFraw_voltages.pdf
BFavg_voltages.pdf
BFraw_ratios.pdf
BFavg_ratios.pdf The mean on the bottom of this plot is where I got the BF number to use for the Local measurement.
PCAL Lab Responsivity Ratio Measurement:
A WSH/GSHL (PS4/PS5)FrontBack Responsivity Ratio Measurement was ran, analyzed, and pushed to the SVN.
The analysis of this measurement produces 4 PDF files which we use to vet the data for problems.
raw_voltages.pdf
avg_voltages.pdf
raw_ratios.pdf
avg_ratios.pdf The mean on the bottom of this plot is where I got the FB number to use for the Local measurement.
alphatrends.pdf shows the history and temperature correction of the lab measurements.
All data and Analysis has been commited to the SVN.
https://svn.ligo.caltech.edu/svn/aligocalibration/trunk/Projects/PhotonCalibrator/measurements/LabData/PS4_PS5/
Special Note: I had to retake a lab measurement due to one of the background data files for the FrontBack PS4_PS5 measurement only having one entry of non-zero data, seems like labview failed to properly communicate with the Keithley after the first background voltage value was read. I have since retaken that measurement on the 10th.
This adventure has been brought to you by Rick Savage & Tony Sanchez.
