Proton Calorimetry/Meetings/2021/07/02

Minutes for UCL Proton Calorimetry Meetings, 23rd June

Simon Jolly, Saad Shaikh, Fern Pannell

Painted 4 scintillator sheet pairs:
- Sheets 48 & 23 with primer – one layer to glue pair.
- Sheets 54 & 1 with appliance – one layer to glue pair.
- Sheets 52 & 11 with appliance and then primer to glue pair – 10-15 mins for appliance layer to dry.
- Sheets 53 & 2 with appliance and then primer to glue pair – 30-40 mins for appliance layer to dry.
Neither combination gives acceptable results: lots of gaps in paint layer due to either inconsistencies in sheet thickness, placement misalignment or paint reaction.
- Placement of sheets when glueing is difficult: not much room to adjust once placed as this ruins paint layer.
New fitting routine using Gauss–Legendre algorithm and Fumili minimiser implemented into photodiode scripts.
- New routine gives reasonable results where default options either fail or give strange fit results.
- With a given set of fit results, Gauss–Legendre draws Bortfeld curve slightly differently compared to default Adaptive Singular algorithm.
- Might require some optimisation of numerical parameters to correct this. Will investigate, but might be that "slow, accurate, non-live" fit use slower Adaptive Singular to draw curves.
Organised new inventory and beam test equipment into new DeWalt tower – tower kept in D109.
Installed