ENDX Station Measurement:
During the Tuesday maintenace, the PCAL team(Rick Savage & Tony Sanchez) went to ENDX with Working Standard Hanford aka WSH(PS4) and took an End station measurement.
The ENDX Station Measurement was carried out according to the procedure outlined in Document LIGO-T1500062-v15, Pcal End Station Power Sensor Responsivity Ratio Measurements: Procedures and Log, and was started by 1pm & completed by 3:30 pm. There were complications caused by some work being done on the Beckhoff systems, which certainly made this measurement take longer. I would argue that the troubleshooting of the laser turning off forced us to take the enclosure coveres off which increased the light on the TxPD which likely had some effect on the Tx Background. Also might have made our laser less thermally stable with the laser coming up and down a handfull of times.
The First beam spot was not taken.
Martel:
We started by setting up a Martel Voltage source to apply some 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. The analysis code that we run after we return, uses the GPS times, grabs the data and created the 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, the procedure walks us through the steps required to make a series of plots while the Working Standard(PS4) is in the Transmitter Module. These plots are shown in WS_at3_TX.png.
Note: It was the second measurement WS in the Outer beam in the TX module, that our laser stopped working. We DID notice this when it happened, and we got better data the second try. But the laser has already been turned off and the TX enclosure had already been opened.
Next steps include: The WS in the Receiver Module, These plots are shown in WS_at_RX.png.
NOTE: The same thing happened again at the start of these 3 measurements as well.
Followed by TX_RX.png which are plots of the Tranmitter 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.
All of this data is then used to generate LHO_ENDX_PD_ReportV2.pdf which is attached, and a work in progress in the form of a living document.
Special Notes: Line 10 in the pcal_params.py needs to be changed from:
PCALPARAMS['WHG'] = 0.916985 # PS4_PS5 as of 2023/04/18
To:
PCALPARAMS['WHG'] = 0.9159 #PS4_PS5 as of 2023-08-22
This change would reflect the changes we have observed in the measurements of PS4_PS5 responsivity ratio measurements taken in the lab which affect the plots of Rx Calibration in sections 14 and 22 of the LHO_ENDX_PD_ReportV2.pdf.
Investigations have shown that PS4 has changed but not PS5 OR Rx Calibration. There may also be another location where this change needs to be made to accuraetely depict the changes found in PS4.
All data and Analysis has been commited to the SVN.
https://svn.ligo.caltech.edu/svn/aligocalibration/trunk/Projects/PhotonCalibrator/measurements/LHO_ENDX/tD20230926/
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
All data and Analysis has been commited to the SVN.
https://svn.ligo.caltech.edu/svn/aligocalibration/trunk/Projects/PhotonCalibrator/measurements/LabData/PS4_PS5/
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
PS4PS5_AlphaTrends .PDF shows a trand of lab Responsivity Ratio Measurements done with PS4 over PS5.
This adventure has been brought to you by Rick Savage & Tony Sanchez.
