Proton Calorimetry/Meetings/2021/04/28

== Minutes for UCL Proton Calorimetry Meetings, 28th April ==

=== Present ===

'''Simon Jolly''', '''Raffaella Radogna''', '''Saad Shaikh'''

=== [[ELogs/SaadShaikh|Saad Shaikh]] ===
*Met with Simon last week to take detector measurements:
**Measured stack thickness and recorded sheet order for UCLH beam test.
**Briefly tested cross-talk with UCLH setup – little to none observed.
*Investigated source of noise "pulsing" observed during UCLH beam test, results record in [http://www.hep.ucl.ac.uk/pbt/wiki/Proton_Calorimetry/Experimental_Runs/2021/Apr22 this page].
**Pulsing largely due to external electronic noise from 50Hz mains.
**CMOS sensor amplifies external noise.
**Grounding detector enclosure significantly reduces noise, even in lab conditions.
*Software developments:
**Added argument to all plotting routines to set y-scale range. Setting to 0 sets the default range.
**Added argument to averaged replay script to set the averaging rate (separate to frame rate).
**Added argument to stepped replay script to choose which measurement to start from and the number of measurements to replay. Last measurement persists on screen.
**Live plot and fit can now accept background and shoot-through measurements to plot calibrated data.
***Calibrated data written to file accessed by Bortfeld page on web GUI.
*Completed analysis of photodiode data from [http://www.hep.ucl.ac.uk/pbt/wiki/Proton_Calorimetry/Experimental_Runs/2021/Apr15 UCLH beam test], results discussed in [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2021/SS210428_UCLH_2.pptx this presentation].
**Due to signficant electronic noise, better not to do background subtraction.
**Best fit results came by not performing any correction of pulsing observed from electronic noise.
**Fit results similar for high and low current results. Should be able to do direct comparisons with CMOS sensor.
**Wrote macro to read reference curves from UCLH. Emailed Andy asking for required x-axis offset to compare with measurements made in detector.
*Will analyse CMOS sensor data for next week.