Proton Calorimetry/Meetings/2020/04/29

Minutes for UCL Proton Calorimetry Meetings, 29th April (Everyone is working from home)

Present

Simon Jolly, Laurent Kelleter, Saad Shaikh, Raffaella radogna

Saad Shaikh

• Implemented Libdedx functions to retrieve CSDA ranges and dE/dx for protons, helium ions and carbon ions in either water or polystyrene. Used to provide initial range estimates in fitting process.
• Set up GEANT4 detector simulation to compile and run within Eclipse.
  • Will set up parallel basic example GEANT4 project to serve as template to rebuild Laurent's simulation.
• Implemented routine to construct reference SOBP curves from HIT FLUKA tables, given XML file of beam settings used. Will be used to compare reconstructed SOBP from QUARC.
  • Will analyse QUARC SOBP data this week.
• Raffy suggested a (temporary) option to fit exponential for fragment tail in ion fits.
  • Laurent suggested two straight lines might be better, as shown in Ying 2017. Will read this paper, but better to try implementing fragmentation properly.
• Laurent suggested to contact Lennart Volz about cross-section data for nuclear fragmentation.
  • Will get in touch with him later this week/early next week after reading Horst 2017.
• Laurent highlighted importance of direct particle hits in CMOS sensor, which might replace issue of detector alignment.
  • Already pulled and implemented code to estimate direct hits when implementing new cross-talk uncertainty calculation. How to do this with photodiodes?
• Laurent suggested that Birks' law should be modified to better handle high dE/dx in ion fits.
  • Will investigate third-order polynomial correction posed by Chou 1952.
• Simon suggested to start working on FPGA soon to communicate with new prototype detector front-end.
  • Try to get Zybo board to output a clock signal (e.g. 10MHz square-wave).
• Need to do 6-month research log entry.