Proton Calorimetry/Meetings/2025/01/29

Minutes for UCL Proton Beam Therapy Group Meetings, 29th January

Joe Bateman, Sonia Escribano, Simon Jolly, Febian , Raffaella Radogna (via Teams)

First part of presentation on understanding of PBT, the QuARC and associated electronics

Scintillators
- 175 sheets have been sent to Wayne and John for machining
- Now have 183 sheets left in lab
- In future will need 32 x1.5mm sheets for clatterbridge but will require new ddc board with PD's interleaved
- Therefore can use some of the left scintillators for this module potentially? So box up left over scintillator sheets
Photodiodes:
- Currently have 192 in use - need 256 for 4 modules
- Joe has quote for 100
- Smoke coming from clatterbridge rev b board when testing
  - Something coming into the LDO has blown
- Need to check polarity of PDs on revB boards
- PDs on revD boards work except 1
- USB104 2 working, 1 is not programmed, 4th board that was Febian working with is now working
- Board4 no longer resetting but when trying to acquire data and cable is in PMODA it doesn't ready any measurements
All calibration errors have now been fixed
Just have a new file that calculates a file of the scaling factors per PD boards i.e. one file of scaling factors per PD board
For calibration files - reversing not necessary as doing shoot through from both sides
Would be good for own analysis to have one file for each side
- 1 hex file
- 2 calibrated files
- 2 fitted files

Fixed discrepancy between TOPAS and FRED Bragg peak for 154.97 MeV pencil beam (due to differences between energy spread definition in the codes).
Improved agreement between two simulation codes seen now, although discrepancies increase as energy of PB decreases.
Plotted 2D profiles and SOBP for QuADProBe and DICOM param for run33 in TOPAS and FRED
Plotted 2D profiles and SOBP for DICOM params in TOPAS and FRED for 3by3 and 5by5 10 Gy box fields - although fields look smeared out
- ICOM beam size is at isocentre - not at source so need to back project somehow
Planning QuADpProBe paper for Frontiers special edition