Proton Calorimetry/Meetings/2018/11/14

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Minutes for UCL Proton Calorimetry Meeting, 14th November 2018 (D17, Physics & Astronomy, UCL)


Simon Jolly, Raffaella Radogna, Laurent Kelleter, Jeremy Ocampo, Saad Shaikh, Fernando Franco Felix, Ohie Mayenin, James Golbourn

Everybody introduced themselves to James; James introduced himself to everyone.


  • Reading through relevant chapters of Proton Therapy Physics by Paganetti.
  • Lots of background reading on QA devices and processes: LK promises to forward on paper on PSI QA systems.
  • To Do:
    • Read through QA paper from LK.
    • 4 days a week of MSc courses: Advanced QM, Molecular BioPhys, Physics of Stars; Climate and Energy, Advanced Stats, Molecular Physics. Also studying particle physics.


  • Almost finished Geant4 tutorials:
    • Geant4 installed on laptop.
    • Installed MacPorts and ROOT on Mac.
  • Had questions about how Geant4 calculates dose deposition.
  • Still going through reading list provided by Jamie McClelland and Adam Gibson.
  • To Do:
    • Build Geant4 simulations of Cherenkov emission in water and scintillation light output from scintillator block.
    • Contact Adam Gibson for existing Geant4 Cherenkov simulations.
    • Find optimal Satechi USB-C adapter.


  • Finished working through first Geant4 tutorial on photon beam: will look at proton simulations.
  • Plan of action is to work from Geant4 to BDSIM, then add in CAD modelling, before improving CAD model.
  • To Do:
    • Proton Geant4 tutorials.
    • Take a look at BDSIM: will contact SJ when ready to move on to BDSIM tutorials.


  • Started reconstructing spectra from LeCroy waveform data from Birmingham experimental runs:
    • Parameters need tweaking in Dan Walker's reconstruction code to match Caen spectra.
    • Needed to widen window in which pulse arrives: SJ suggests contacting Dan to implement code to find pulse rising edge.
  • Still trying to quantify LeCroy scope dead time: will contact SJ when next tests need to be made to check setup.
  • To Do:
    • Talk to Dan Walker about pulse rising edge finding.
    • Check total number of protons in each peak for eyepatch data.
    • Send spectra to Tony Price.
    • Plan to have all Birmingham data analysed by Christmas: both spectra and tracker.


  • Still checking through Geant4 simulations:
    • Phantom rotating in visualiser but not in actual simulation...
    • Rotation now fixed: managed to reconstruct and view images of phantom.
  • Need to convert ITK format to something with 2D slices to analyse data:
    • SJ suggests contacting Jamie McClelland for DICOM conversion and viewing tools.
  • Probably don't need to run on Legion: better reconstruction using fan beam with 10 million protons.
  • To Do:
    • Assign ID to each proton to speed up pre and post matching.
    • Contact Simon Rit and Niels Krah to convert ITK images to DICOM.
    • Contact Jamie McClelland for DICOM image conversion and reconstruction tools.
    • Transfer report due 30th November.


  • Met Daniel Spring from Hamamatsu to look into optimal photodiodes:
    • New products may be available that fit our needs.
    • Custom photodiode also possible: removing resin that covers photodiode reduces transverse size but makes it much more sensitive.
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