Proton Calorimetry/Meetings/2022/05/11

Minutes for UCL Proton Calorimetry Meetings, 11th May

Present

Saad Shaikh, Simon Jolly, Raffaella Radogna

Saad Shaikh

• Completed LED lab tests with unpainted sheets and white paper, black card and mylar foil. Results presented in this presentation.
  • Mylar foil provides best combination of large signal and minimum cross-talk.
  • Still observe around 5% crosstalk, due to light leaking around edges of sheet.
  • Optical gel increases signal level by 20-30% without increasing cross-talk.
  • White painted sheets 10-20 times dimmer than unpainted sheets – optical gel may not be necessary at all.
  • Should perform test again with black stack holder before and after spray-painting black.
• Nexys Video board died during LED tests with Rev. C boards. Unclear cause of issue and Rev. C boards now give incorrect configuration pattern when using new Nexys Video board.
  • Asked Matt Warren to look at Nexys Video board and will investigate Rev. C issues further.
• Spoke with Ruben about measuring Birks constant. Tests possible with proton beam at UCLH and with alpha particles and electrons at UCL.
  • Need to discuss further – but work could make for a good MSci project.
• Will prepare talks/posters for CALOR and Elba conference.