Proton Calorimetry/Meetings/2017/02/22

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

Present

Simon Jolly, Anastasia Basharina-Freshville, Laurent Kelleter, Adam Knoetze, Matthieu Hentz

MSci reports due 27th March.

AK:

• Working with pulser and LED.
• Running LED pulser with regular pulse shape and spacing.
• Seeing drops in ADC spectrum peak position from 7400 at 100Hz to 6400 at 5kHz.
• During MedAustron visit will take data using detector emulator.

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...

MH:

• Still no response from Clatterbridge and Carsten Welsch on PDFs of layout: SJ will chase it up.
• Simulations of Clatterbridge beamline:
  • Tracking emittance evolution.
  • Initial beam parameters very large. Will use values from Hywel Owen:
    • σ_x = 4mm
    • σ_y = 4.5mm
    • σ_x' = 2.03mrad
    • σ_y' = 1.2mrad
  • Some particles seem to pass through metal shielding: LK suggests checking 3-dimensional structure of beamline.
  • Beamline support needs adding.

LK:

• Looking at getting the proton range (mean proton energy) from a scintillation photon depth distribution.
• Deriving analytic function to describe quenched Bragg Peak very complex...and may not be accurate...

List of equipment for MedAustron

Hand Luggage

• Scope
• 2 PMTs + 1 base
• DAQ laptop
• Digitiser
• HV unit
• Scintillator bars

Hold

• Collimators
• Box
• Signal cables
• HV cables