Proton Calorimetry/Meetings/2022/05/11

Minutes for UCL Proton Calorimetry Meetings, 11th May

Saad Shaikh, Simon Jolly, Raffaella Radogna

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.