Proton Calorimetry/Meetings/2017/12/13

Minutes for UCL Proton Calorimetry Meeting, 6th December 2017 (D17, Physics & Astronomy, UCL)

Present

Simon Jolly, Laurent Kelleter, Anastasia Basharina-Freshville, Jordan Silverman, Dan Walker

Matthieu Hentz:

• Refining Clatterbridge simulations:
  • Noticed that particles were getting through a gap between the dosimetry box and the nozzle: due to Geant having difficulties with coinciding boundaries.
  • Fixed by putting a brass ring around the nozzle on the outside of the box.
• Completing coursework and reading up on proton CT.

DW:

• Working on ROOT fitting for LeCroy binary data:
  • Two classes for loading (LeCroyData) and analysing (LeCroySpectrum) data.
  • Methods that get time/voltage arrays for individual triggers reset time to zero.
  • Current integration in LeCroySpectrum chooses region based on voltage levels: SJ and LK suggested more robust to use time window. ABF said Caen integration window 100–200 ns.
• Will contact Tony Price at Birmingham regarding taking some data with trackers!

JS:

• Investigating alternative methods for fitting to Matthieu's simulated energy spectrum for Clatterbridge data.

ABF:

• Investigating difference between MC truth and energy resolution returned by fit:
  • Adjusting energy resolution of scintillator (nominally 8.5%): gives Monte Carlo truth resolution of 1.36% at 60MeV.
  • Fit resolution doesn't change with increasing energy resolution.
  • Spectra look very similar for different scintillator resolutions: overlap within error?
  • Will run simulations with very small resolutions and dig further into fit.
• Will chase up Hamamatsu regarding flat panels.

MH:

• Run Clatterbridge simulations with angled stopper:
  • Largest angular offset of 15 degrees means 0.75mm difference in depth.
  • Angle offset causes spectrum to flatten.

LK:

• Has written a talk for PPRIG...