Proton Calorimetry/Meetings/2018/01/17

Minutes for UCL Proton Calorimetry Meeting, 17th January 2018 (D17, Physics & Astronomy, UCL)

Present

Simon Jolly, Matthieu Hentz, Anastasia Basharina-Freshville, Jordan Silverman, Dan Walker

DW:

• Integration of Leroy binary signals were giving negative results:
  • Probably a result of including rising edge of pulse when calculating baseline.
  • By cutting off the second half of pre-trigger pulse, only 1 pulse giving negative integral.
  • SJ suggests looking at smallest pulses to make sure integration is valid; also check negative result.
  • ABF suggests comparing integration windows of 150 ns and lower to Caen ADC data: currently using window over whole pulse.
• To Do:
  • Fix negative pulse.
  • Adjust timing window to replicate Caen spectrum.
  • Meeting on Monday with Tony Price.

JS:

• Reading (and reading (and reading)) Geant4 manuals, MSci report from MH and PBTWiki pages on Clatterbridge simulations.
• To Do:
  • Will set up meeting with MH to check progress on Clatterbridge simulations.
  • Copy over simulations to user directory to play around with simulations.

ABF:

• Will get JS and DW to check thickness of scintillator sheets.
• Update on single module detector simulations and scintillator paint tests:
  • Checking Monte Carlo Truth with detector output.
  • Still a difference between MC Truth and reconstructed resolutions, but much smaller than before when using mono energetic proton beam.
  • Resolutions are good enough for paper.
• Paint tests with scintillator still pending:
  • Retested painted scintillator sheet with higher LED voltage: resolution now matches unpainted, wrapped scintillator.
• To Do:
  • Paint another sheet with aerosol.
  • Writing paper.
  • Sensor selection for beam test.

MH:

• Mostly coursework for CDT courses: Numerical Optimisation, High Performance Computing, Machine Learning with Big Data, Research Computing with C++, Inverse Problems in Imaging.
• Background reading on pCT reconstruction and group project at The Economist.
  • Mathematical background to CT reconstruction.
  • Notation in Comp Sci is different...
• Staging of Clatterbridge now finished!
  • Some behaviour doesn't quite make sense: will investigate.
  • Still need to get faster particle readout working with buffering.
• To Do:
  • Exams Monday & Tuesday.
  • Meeting with Jordan on Wednesday.
  • Buffering of readout in Geant4.