Proton Calorimetry/Meetings/2017/05/31

Minutes for UCL Proton Calorimetry Meeting, 31st May 2017 (D17, Physics & Astronomy, UCL)

Present

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

ABF:

• Spoken to Samer Al-Kilani about splitter issues:
  • Splitter probably not the problem: likely to be cables.
  • Direct limo-to-MCX connector for splitter.
  • SJ will contact Izzat Darwazeh.
  • ABF will look into requirement and spec for active splitter.
• Looking into photodiode readout: not sure how to read out photodiode pre-amp.
• Incorporating LK's hadronic effects into simulations: LK may be using an older Geant4 Physics List, so ABF's simulations may already include them.
• Met Nuvia on Monday:
  • Discussed all requirements, including flatness tolerances.
  • Will provide 1 x 10 x 10 cm sample sheets.

LK:

• Inclusion of nuclear build-up in Bragg fit:
  • Energy deposition from hadronic secondaries looks like an ellipse.
  • Including this shape in Bortfeld function doesn't give accurate fit: Bortfeld function includes some of this energy deposition already...
  • Subtracting quarter-ellipse gives much better fit to build-up region.
  • Better results with photon emission fit using full ellipse subtraction.
  • However, range-energy conversion does not work when hadronic effects included: range only correct when considering strict Bortfeld electron interactions.
  • Plan to fit to build-up but stick with Bortfeld for E-R conversion.