KLF beamline meeting - March 6, 2025
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Agenda
- Announcements
- GEANT4 Simulations (Richard)
- Hit rate predictions for GlueX-II running from GEANT4
- Beam properties with a 10% radiator from GEANT4
- Beam properties with a 20% radiator from GEANT4
- Hit rate predictions for GlueX detectors for KLF with a 10% radiator from GEANT4
- Hit rate predictions for GlueX detectors for KLF with a 20% radiator from GEANT4
- Radiation Damage to GlueX Start Counter (Hovanes)
- Any other business
Minutes
Present: Vitaly, Igor, Pavel, Hovanes, Moskov, Eugene, Richard, Beni, Stuart, Sashi, Tim, Josh, Edy, Mikhail, Marshall
- Richard presented results of his simulations showing the particles yields for 10% and 20 %radiator.
- The gain in kaon rates with 20% radiator vs 10% is about factor 1.35.
- Richard also showed his results for detector hit rates with 10% and 20% radiators. For 20% radiator he is using 15cm tungsten plug, while for 10% radiator he is using 14cm tungsten plug.
- For these plots, his simulation time s equivalent to 860μs. The results show that both configurations produce acceptable rates in GlueX detectors if compared to GEANT4 simulations for GlueX-II running.
- Hovanes looked into the results of Pavel's simulations of KLF beam in the main Hall D with FLUKA to evaluate the impact that the radiation environment will make on GlueX Start Counter during KLF.
- First, Hovanes compared FLUKA's predicted accumulated dose in the cone of the start counter with published results of radiation damage tests from China. Based on the comparison, the scintiallator material very forward tip of GlueX start counter will likely get radiation damage. The transparency and the light yield will be reduced. Therefore, GlueX may not like the idea of using the existing start counter in KLF.
- Hovanes also compared the prediction of FLUKA for 1-MeV equivalent neutron fluence during KLF in GlueX start counter SiPMs to Yi's test results for BCAL SiPMs. Based on this comparison, the dark current in SC SiPMs may increase by a factor of 40 and the signal amplitude will decrease by about 20%.
- There was a discussion regarding the impact of SiPM damage on the timing resolution. There was no argument presented that the timing resolution of the start counter will be unacceptable for KLF after expected radiation dose.
- Next meeting will be on March 13th .