Proton Calorimetry/Meetings/2018/02/07

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Minutes for UCL Proton Calorimetry Meeting, 7th February 2018 (D17, Physics & Astronomy, UCL)


Simon Jolly, Ruben Saakyan, Matthieu Hentz, Jordan Silverman, Anastasia Basharina-Freshville, Laurent Kelleter


  • Meeting with LK at TU Wien HEPHY on 1st February:
    • TU Wien have 26x26mm sensor developed for Belle they want to use for proton CT.
    • Sensor is very early in pCT development: readout is slow (~1,000 frames/s).
    • Potential for pCT collaboration.
    • They are sharing experimental time with us at MedAustron on 22/23 March.
    • We will have 6 hours on Thursday night and ~4 hours on Friday night.
    • Will make single module measurements for them: MedAustron rate and pCT calorimetry.
    • Accommodation is booked: 4 rooms in Orange Wings (close to MedAustron).
  • Both Zarges enclosures are finally here:
    • Smaller one is painted: waiting on specs from ISDI to choose patch panel connectors.
    • Larger one just arrived: Derek will paint tomorrow.


  • Running tests on Scintillator Sheets using LED:
    • First tests with Nikon DSLR carried out on 5/6 February.
    • Some sheets not properly painted, so light leaks in around fibre.
    • Camera highly adjustable: RS suggests running tests with LED settings used for PRIAPUS saturation.
    • Lens aberrations seen with high light levels.
    • Variation seen across sheet but average light level approximately the same for all sheets.
  • To Do:
    • Some sheets need repainting: will speak to Derek Attree.
    • Chasing up ISDI!
    • Test USB3 patch panel connector.
    • Finish off analysis.
    • Add Remote Desktop information to Wiki.


  • To Do:
    • Continue LED tests: rerun with settings that saturated PRIAPUS; set up radioactive source.
    • Label scintillator sheets.
    • Polish scintillator sheets.
    • Analyse LED data.


  • Had meeting with Hamamatsu.
  • 2 potential products available:
    • Linear image sensor.
    • Position sensitive linear image sensor.
  • Both active pixel sensor strips.
  • Industrial devices: less than £50 each!
  • Readout available but expensive (£800).


  • Focussing on buffered event writing in Geant4 to speed up simulations.
  • Fixed issue by avoiding use of pointers: needed a custom accumulator class.
  • Factor of 30 speed up with buffering!
  • Code needs tidying up..
  • To Do:
    • Tidy up Geant4 buffering code.
    • Update Wiki.


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