Proton Calorimetry/Meetings/2017/03/29

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

Present

Simon Jolly, Laurent Kelleter, Anastasia Basharina-Freshville

ABF:

• 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.

LK:

• 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.