Proton Calorimetry/Meetings/2017/11/22

Minutes for UCL Proton Calorimetry Meeting, 22nd November 2017 (D17, Physics & Astronomy, UCL)

Present

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

ABF:

• Spoke to Ruben Saakyan about Nuvia sheets:
  • Ruben visiting Prague in the next few weeks.
  • Waiting for Nuvia to determine whether they can do 2 mm sheets.
• Spoke to Hamamatsu about flat panel detectors:
  • Contact person might be called Simon...
  • Preferred detector 50x50 mm version: will check the differences.
• Working on fitting to single module spectrum:
  • Issues with fitting in ROOT: version dependent...
  • Now fitting to tail as well as peak, but transition still needs work.
  • Will add in exponential term to 'join' two parts of fit.

JS:

• Spoke to Glen Cowan at RHUL on ROOT curve fitting:
  • Suggested to add in another convolution;
  • If that doesn't work, try doing piecewise fit.
• Will prototype in Python before moving over to ROOT.

DW:

• Very close to finishing off producing spectra from Lecroy binary files.
• Will then move on to curve fitting...

MH:

• Running Clatterbridge simulations with changes in nozzle cap angle:
  • Very little difference in spectra.
  • OMA Monte Carlo school indicated overlap in geometry boundaries may be a problem...
• Changed how particles recorded from stepping action to sensitive detector.
• Given up on installing Geant4 on MacBook Pro: will switch over to piss poor Lenovo CDT laptop:
  • SJ will ask Tim Scanlon about swapping for a machine with more horsepower.

LK:

• Discussing build-up paper with Adam Gibson:
  • Simplified definition of build-up to be based on Bragg curve.
  • Understanding more about the physics!
  • Reran simulations at higher energies: absorber too small.
  • Will contact various OMA colleagues to understand origin of high entrance dose for protons above 200 MeV.