Proton Calorimetry/Meetings/2021/11/17

Minutes for UCL Proton Calorimetry Meetings, 17th November

Simon Jolly, Saad Shaikh, Raffaella Radogna

Further analysis of November test beam data, discussed in this presentation.
- Compared November photodiode data to April CMOS data:
  - Observed consistent discrepancy in build-up to Bragg peak causing poor fits with photodiodes.
  - WET seems to be consistent across data sets.
- Fitting data around peak does not improve things.
- Reverse engineered fit using fixed "correct" values of range and sigma, and varying only Birks' and phi.
  - Observe large differences in Birks' constant across data sets, photodiode fits remain worse.
Will perform fits with CMOS data, taking only central stripe.
- Simon to provide WET calibration value for fitting Nikon data from November.
Discussed potential causes of poor fits with Laurent:
- Could be that scintillator sheets are damaged after stripping and repainting.
- Overarching problem of detector is non-uniform light output, dependant on beam position and light sensor position/size. Photodiodes could be missing dose.
- Doing a test with mylar foil wrapping could be useful – especially with new sheets from Nuvia and Rev. C DDC232 boards.
FPGA programming:
- Nexys Video design ready for testing with Rev. C hardware.
- Ported PMOD design to USB104, will test and debug.
- Will debug Matt's fix for signals crossing clock domains.
First draft of FRPT presentation, small changes to videos/images required.