Proton Calorimetry/Meetings/2021/11/17

Minutes for UCL Proton Calorimetry Meetings, 17th November

Present

Simon Jolly, Saad Shaikh, Raffaella Radogna

Saad Shaikh

• 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.