Proton Calorimetry/Meetings/2021/11/17
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=== [[ELogs/SaadShaikh|Saad Shaikh]] === | === [[ELogs/SaadShaikh|Saad Shaikh]] === | ||
- | * | + | *Further analysis of November test beam data, discussed in this presentation. |
+ | **Compared November photodiode data to April CMOS data: | ||
+ | ***Observed consistent discrepancy in build-up to Bragg peak causing poor fits with photodiodes. | ||
+ | ***WET seems to be consistent across data sets. | ||
+ | **Fitting data around peak does not improve things. | ||
+ | **Reverse engineered fit using fixed "correct" values of range and sigma, and varying only Birks' and phi. | ||
+ | ***Observe large differences in Birks' constant across data sets, photodiode fits remain worse. | ||
+ | *Will perform fits with CMOS data, taking only central stripe. | ||
+ | **Simon to provide WET calibration value for fitting Nikon data from November. | ||
+ | *Discussed potential causes of poor fits with Laurent: | ||
+ | **Could be that scintillator sheets are damaged after stripping and repainting. | ||
+ | **Overarching problem of detector is non-uniform light output, dependant on beam position and light sensor position/size. Photodiodes could be missing dose. | ||
+ | **Doing a test with mylar foil wrapping could be useful – especially with new sheets from Nuvia and Rev. C DDC232 boards. | ||
+ | *FPGA programming: | ||
+ | **Nexys Video design ready for testing with Rev. C hardware. | ||
+ | **Ported PMOD design to USB104, will test and debug. | ||
+ | **Will debug Matt's fix for signals crossing clock domains. | ||
+ | *First draft of FRPT presentation, small changes to videos/images required. |
Revision as of 16:43, 17 November 2021
Minutes for UCL Proton Calorimetry Meetings, 17th November
Present
Simon Jolly, Saad Shaikh, Raffaella Radogna
Saad Shaikh
- Further analysis of November test beam data, discussed in this presentation.
- Compared November photodiode data to April CMOS data:
- Observed consistent discrepancy in build-up to Bragg peak causing poor fits with photodiodes.
- WET seems to be consistent across data sets.
- Fitting data around peak does not improve things.
- Reverse engineered fit using fixed "correct" values of range and sigma, and varying only Birks' and phi.
- Observe large differences in Birks' constant across data sets, photodiode fits remain worse.
- Compared November photodiode data to April CMOS data:
- Will perform fits with CMOS data, taking only central stripe.
- Simon to provide WET calibration value for fitting Nikon data from November.
- Discussed potential causes of poor fits with Laurent:
- Could be that scintillator sheets are damaged after stripping and repainting.
- Overarching problem of detector is non-uniform light output, dependant on beam position and light sensor position/size. Photodiodes could be missing dose.
- Doing a test with mylar foil wrapping could be useful – especially with new sheets from Nuvia and Rev. C DDC232 boards.
- FPGA programming:
- Nexys Video design ready for testing with Rev. C hardware.
- Ported PMOD design to USB104, will test and debug.
- Will debug Matt's fix for signals crossing clock domains.
- First draft of FRPT presentation, small changes to videos/images required.