Proton Calorimetry/Meetings/2017/03/08

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Minutes for UCL Proton Calorimetry Meeting, 8th March 2017 (D17, Physics & Astronomy, UCL)

Present

Simon Jolly, Ruben Saakyan, Anastasia Basharina-Freshville, Laurent Kelleter, Adam Knoetze, Matthieu Hentz, Andreas Christou, Jordan Silverman

AC:

  • Working on waveform fitting in ROOT:
    • Gaussian part of the fit works.
    • Trying to fit falling edge of pulse using single exponential.
    • Will try implementing double exponential.
  • Can already filter out pulses with more than one peak:
    • Will reconstruct ADC spectrum from filtered waveforms.
    • Will vary integration window for pulse (50, 100, 150ns used in experiment).

MH:

  • Looking at emittance and beam profile evolution along Clatterbridge beamline.
  • Ignoring protons that fall outside the measurement region in simulations.
  • Need to check initial parameters and beam density distributions: will plot intensity distributions to make it clearer.
  • Updated geometry based on information from Andrzej's.

AK:

ABF:

  • Testing LED pulser to check whether variation in gain comes from LED or PMT.
  • After MedAustron will retest with super-stable SuperNEMO LEDs.
  • Taking signal from last dynode rather than anode to avoid final gain stage (~3.5) and saturation.
  • Long scintillator bars arrived from Nuvia:
    • Wrapped in mylar only to reduce amount of internal reflections.
    • Energy resolution worse: ~11% at 1MeV.
  • Preparing for MedAustron: MH and LK will prepare cables...
  • Housing needs modifying to fit long scintillator bar: need to make sure its light tight in case room lights cannot be switched off. LK suggests using a cardboard box...

LK: