Difference between revisions of "JEF meeting, October 22, 2021"

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* Data analysis
 
* Data analysis
 
* Simulations
 
* Simulations
 +
:: - [https://halldweb1.jlab.org/wiki/index.php/File:JEF_UPDATE_OCT20.pdf Photon Classification Update] -- Azizah
 +
 +
=Minutes=
 +
Attendees: Igal,Sasha,Liping,Jon,Jane,Arshak,Zisis,Azizah,Olga,Igor,Susan,S.T.
 +
* We went over an update from Hui at SICCAS regarding their status
 +
** Some progress regarding raw material has been made; will follow up in a month
 +
** Still need to meet with Eugene and the lab management
 +
** Still considering arranging to use 460 SICCAS crystals from Hall C (originally for NPS)
 +
* Want to resume module construction in December after end of SRC experiment on Dec 6
 +
** Still looking at getting support from the detector support group
 +
** Due to concerns about broken straps with nominal 25 micron thickness, we opted to switch to 50 micron thick straps
 +
*** Vendor has been identified
 +
*** Can safely apply larger torque needed to apply appropriate pressure for silicon cookies
 +
** All 1600 brash flanges needed for full insert set are in house
 +
* Sasha showed results of beam studies of a set of 12 crystals using one of the arms of the Pair Spectrometer setup in Hall D
 +
** All 12 modules were operational
 +
** Saw ~2.5% energy resolution
 +
* Azizah gave an update on using TMVA for separating hadronic split-offs from neutral showers
 +
** Training on ω→π+π-π0 events with charged tracks and neutrals separated into 2 sets
 +
** Cut on energy in BCAL has no impact on results
 +
** Dropped some timing info due to how the training was set up
 +
** Shower shape asymmetry variable and E1/E9 ratio vary useful for distinguishing split-offs from true neutral showers
 +
** Tried several different MVA algorithms -- so far BDT looks the best
 +
** Has not checked for over-training yet; Igal also suggested looking into hyperparameters
 +
** Result from previous TMVA training done by Rebecca (IU) is available as  "shower quality factor" in the analysis

Latest revision as of 14:02, 22 October 2021

Meeting time and location= 9:30 am EST (JLab time) Bluejeans only


Connection instructions

We are using BlueJeans Video/Audio conferencing. Our meeting ID number is 992533564. Click "Expand" for more details.

  • Make sure you have created a BlueJeans account via your JLab CUE account using this link:
  • If connecting via Web Browser: click this link (no passcode is needed):
  • If connecting via Phone: Dial one of the following numbers and then enter the meeting ID above and hit "#" or "##"
  • If connecting via Polycom unit:
    • Dial 199.48.152.152 or bjn.vc
    • Enter meeting ID above

Agenda

  • SICCAS crystals
- Meeting with SICCAS
  • Module fabrication
- Beam test of the fabricated modules using PS setup -- Sasha
  • COMCAL tests, TAC running, etc.
  • Data analysis
  • Simulations
- Photon Classification Update -- Azizah

Minutes

Attendees: Igal,Sasha,Liping,Jon,Jane,Arshak,Zisis,Azizah,Olga,Igor,Susan,S.T.

  • We went over an update from Hui at SICCAS regarding their status
    • Some progress regarding raw material has been made; will follow up in a month
    • Still need to meet with Eugene and the lab management
    • Still considering arranging to use 460 SICCAS crystals from Hall C (originally for NPS)
  • Want to resume module construction in December after end of SRC experiment on Dec 6
    • Still looking at getting support from the detector support group
    • Due to concerns about broken straps with nominal 25 micron thickness, we opted to switch to 50 micron thick straps
      • Vendor has been identified
      • Can safely apply larger torque needed to apply appropriate pressure for silicon cookies
    • All 1600 brash flanges needed for full insert set are in house
  • Sasha showed results of beam studies of a set of 12 crystals using one of the arms of the Pair Spectrometer setup in Hall D
    • All 12 modules were operational
    • Saw ~2.5% energy resolution
  • Azizah gave an update on using TMVA for separating hadronic split-offs from neutral showers
    • Training on ω→π+π-π0 events with charged tracks and neutrals separated into 2 sets
    • Cut on energy in BCAL has no impact on results
    • Dropped some timing info due to how the training was set up
    • Shower shape asymmetry variable and E1/E9 ratio vary useful for distinguishing split-offs from true neutral showers
    • Tried several different MVA algorithms -- so far BDT looks the best
    • Has not checked for over-training yet; Igal also suggested looking into hyperparameters
    • Result from previous TMVA training done by Rebecca (IU) is available as "shower quality factor" in the analysis