Meeting solid ec

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ECal weekly May 2025

  • Weekly ECal May 8, 2025
    • Ye's slides on comparison of preCDR vs. latest simulation. Note that the preCDR plot (on 2D plane energy vs. R, reproduced by Ye) is for e.g. "pi- from pi-" while the latest simulation is "everything from pi-". Even though the plots are for different things, it seems to contradict the table that the latest simulation gives much higher radiation background.
    • Zhiwen will dig into how Jin extracted radiation dose from the particle rate plots.
    • We discussed the labor cost of large-angle ECal and SPD assembly and testing. Here is Richard's estimate, consistent with 2023 estimate of 744 PW scaled by area of 440/1800.
  • Weekly ECal May 1, 2025
    • Ye worked out a way to extract the z-dependence of Edep in the Preshower and Shower. Counting the whole preshower as a layer, the radiation is pretty high. On the other hand, the radiation in the Shower layers does not look much worse than preCDR, though the exact z-dependence is different. See her presentation: PVDIS_simulation_configuration_comparison_04302025.pdf. Note that the radiation dose of the preshower needs to be integrated over the preshower's Z (slides 2 left, 8, and 9 left).
    • Jianping suggested re-visting low-energy pion comparison of bggen vs. wiser, i.e. DVCS and MARATHON data analyzed by Ye Tian (IMP) and Zhihong. -- followup on 5/8: Ye dig out the old slide but that study stopped at 2GeV for the pion momentum (minimum).
    • Mike and Richard talked to Carl about benchtesting the Shower PMTs, to be followed by MAPMT and MCP-PMT tests.
    • Darren gave a presentation SoLID ECal ML PID on the latest status (from Nov. 2024) of AI/ML PID study. Recap:
      • the study was done using simulation without background, then applied to data
      • e vs. pi0: ML output could reject pi0's (since probability of pi0 is always < 0.5)
      • applying ML to data, we see pi+, pi- and e ID in the output
      • ML-ID'ed e- and pi+ or pi- preshower, ShSum from data agree with simulation very well
      • ECal resolution: had to add by hand about 35% for PSH, 10% for SH
      • one result is ML PID charged pion rejection vs. e- efficiency -- something comparable to classical PID
      • the only thing missing was background simulation!

ECal weekly April 2025

  • Weekly ECal April 10, 2025
    • LHCb tracker upgrade, Table 3.4. (Note 1Gy = 100rad)

ECal weekly March 2025

  • Weekly ECal March 27, 2025
    • Ye showed comparison of Jin's preCDR and latest study. Checking particle entering ECal. Large difference already between Jin's and "THis study" using short endcap and Babar baffle. This means the difference is in the generator (or the interpretation), not the endcap and magnet.


ECal weekly February 20, 2025

  • Mike's PID update. Some discussions:
    • JP: what are the uncertainties in the preshower and Shower calibration? -> Ye and Mike need to find the uncertainty. Ben's plot may be more precise
    • Ye: there is also a 65uA (4409) run
    • JP: there should also be a Preshower cut
  • Question arose how the preshower radiation dose is 3 times higher now (SOLID PVDIS) vs. preCDR value...!
    • JP: there was a study of Fluka va. GEANT by Lorenzo Zana before the Science Review, need to dig this out
    • We need to vet the statements of *3 and *5 estimate (how much SoLID PVDIS is higher than the beam test in terms of radiation dose in the ECal modules, currently in the report)
  • Comments on the report draft:
    • FADC timing should not be in the Shower section

ECal weekly March 2024 to December 2024

  • Weekly ECal October 31, 2024
    • Ben started analyzing the THU base. Here is his Calculation on all three PMT bases
    • Zhihong shared pictures of the super-module being assembled at THU: pic0, pic1, pic2; He will also send a new PMT base design diagram (for the super module) so we can study its possible gain shift in advance
    • Zhihong will look if there are old PMTs with the same base as the 2023 Hall C beamtest, and will do a bench test to study the gain shift if any such PMT/base is found.
    • Xiaochao shared a rough draft of the beam test report. Still need to wrap up some calculation, and need someone to double check all numbers.

ECal weekly March 2023 to February 2024

FY2022 beam test summary

ECal weekly January 2023 to March 2023

ECal weekly January 2013 to October 2022

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