Proton Calorimetry/Meetings/2024/07/17

Minutes for UCL Proton Beam Therapy Group Meetings, 17th July

Present

Joe Bateman, Sonia Escribano, Simon Jolly, Andreas Korn (on Zoom)

Andreas Korn

• Andreas knows Daniel from ATLAS also involved with development of scintillating materials in German polytechnic - wants to help with designing better scintillating sheets - water equivalent density and 3mm.
• Improved technique for optically decoupling insulator - dipping/coating technique as opposed to mylar wrapping - potentially a thinner film coating than the 6um mylar sheets.
• If Daniel can provide 105 by 105 mm sheets or 100 by 100 mm with 3 mm tickets we can test soonish if we can get UCLH beam time.

Sonia Escribano

• Analysis from most recent UCLH beam test
  • Correlating QuARC energies to DICOM energies give constant 4-5 mm offset.
  • Additional ~ 2.5 mm when taking into account WET of NPL transmission calorimeter and UoB CMOS detector.
  • Looking to implement consistent fitting parameters i.e start fitting 5 sheets prior and ending 3 sheets after rather manually changing for each run.
  • Some photodiodes behave weirdly for different runs but not consistently for every run
  • Re-investigate calibration issue and strange results when applying to Christie measurements despite same sheets used.

Simon Jolly

• Some of the QuARC USB-Cs are flaky
• Order of connecting electronics in daisy chain matters
• No set of pristine scintillators as of yet
• Refined electronics and pristine new set of scintillator sheets will be needed before next beam test

Joe Bateman

• Try and run basic Geant4 examples via CVMFS
• Email Ben Morgan from Warwick uniform advice on Geant4 via CVMFS etc