Proton Calorimetry/Meetings/2017/07/05

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Minutes for UCL Proton Calorimetry Meeting, 5th July 2017 (D17, Physics & Astronomy, UCL)


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


  • Running preliminary tests with photodiode circuit using Hamamatsu preamp.
  • Hamamatsu finally provided correct resistor for preamp! 100 kΩ.
  • Looking after summer students for Monday–Wednesday next week (Laurent Wednesday).
  • Still waiting for response from Hamamatsu regarding low gain PMTs; modified PMTs and bases not yet arrived.
  • Will chase up 10 mm sheets from Nuvia.


  • Looking at Geant4 simulations: been poking around on plus1...
  • Struggling with Geant4 tutorials...
  • Will look into updating background information on PBTWiki (with DW).


  • Reading through MSci reports (mainly Adam Knoetze and Andreas Christou).
  • Looking at Adnreas' Java code to read out LeCroy scope binary files.
  • Also comparing Matlab script from LeCroy.


  • Next stage beyond WEPL fast QA device is fast treatment plan verification:
    • Tracking layer measures individual spot profile in 2D.
    • Calorimeter measures longitudinal dose deposition profile.
    • Reconstruct both spot by spot to give 3D dose distribution for each pencil beam spot.
    • Build up 3D dose distribution using information from each spot.
  • Tony Price and Phil Allport at Birmingham has £20k from STFC Network+ (Karen Kirkby) to build prototype:
    • Take PRaVDA single tracking layer.
    • Measure position of 1 proton at a time at ~1 kHz.
    • Also measure proton energy with single module calorimeter.
    • Time acquisition such that we know position and energy of each proton.
  • This requires timing together PRaVDA tracking with our calorimetry:
    • PRaVDA uses 26 MHz(?) clock (synced to iTHEMBA cyclotron frequency) with 1 "frame" per clock cycle.
    • PRaVDA DAQ built by ASPECT: will provide timestamped "event" with proton location.
    • Can use PRaVDA tracker to trigger our calorimeter DAQ: probably use scope.
    • Need to read out header from scope binary file to get precise trigger information.
  • Future detector will need better DAQ:
    • Matt Wing has suggested using EUDAQ generic detector DAQ as software back end.
    • EUDAQ also includes Bristol Trigger Logic Units (TLUs) to aggregate digitised data and create an "event".
    • MW has offered some of Sohail Amjad's time to work on proton calorimetry DAQ.
  • DW will look into LeCroy scope binary files to see if we can get rudimentary trigger information to link with PRaVDA tracker events.
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