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Update PBPS Guide

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arrell_c 2023-08-16 15:40:37 +02:00
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Aramis-Intensity-Diagnostics/PBPS-Guide.md
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@ -6,5 +6,13 @@ Position data maintains FEL pointing, while single-shot pulse energy measurement
## How to use
1. Open photon diagnostics [web app](https://sf-photodiag.psi.ch/app)
2. Under Position/calibration tabs,s elect device from drop down menu 1
3. Select target from drop down menu 2 - default target is 50nm Si3N4
4. Press calibrate
<img src="https://docs.google.com/drawings/d/e/2PACX-1vRGynTQ54ugugA_bM9pYc9eZDlet3Z9MSZWn17wJNwAEM2ORiJGoL8O61frpLBVRpFKlzJ7M05a5Mb1/pub?w=1245&h=1039">
The calibration procedure normalizes the response of the 4 diodes, then scans the device horizontally and vertically over the FEL beam to calibrate the position response.
Once completed (approx 1 minute) the plots are updated with the calibration response. Plotted on the x axis is the device motor position (horizontal - left plot and vertical - right plot) and on the y axis is plotted the normalized horizontal or vertical diode pair response. For a good setup the plot should be a straight line through the 3 data points.
If you are happy with the calibration, press the "Push results/elog" button where the new calibration data is sent to the required data processing pipelines. After an automated restart (~30 seconds) both PV and BS position and intensity data will be calculated with the new calibration. An elog entry is made detailing the calibration data.