Proton Calorimetry/Meetings/2017/03/29

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Minutes for UCL Proton Calorimetry Meeting, 29th March 2017 (D17, Physics & Astronomy, UCL)


Simon Jolly, Laurent Kelleter, Anastasia Basharina-Freshville


  • Looking at specific peak PMT current:
    • Acquire data with different rates:
    • Calculate average current to compare at what point saturation occurs.
    • Matches predictions almost exactly!
    • Small rise at "saturation" current before drop off.
  • Will pass on information to Hamamatsu to "guide" them in producing lower gain PMTs.


  • Looking at dose build-up effect in proton therapy and secondary particles.
    • Secondary particles in Geant4 difficult to characterise due to range cut.
    • GetTotalEnergyDeposit() doesn't include energy from secondary particles...
    • Need to check whether 20 micron range cut is short enough with Adam Gibson.
  • Clear build-up effect from secondary protons:
    • Need to check RBE of the resulting short-range protons.
    • Effect of hadronic build-up means Bragg curve incorrect for entrance dose.
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