Difference between revisions of "JEF meeting, October 22, 2021"
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=Agenda= | =Agenda= | ||
* SICCAS crystals | * SICCAS crystals | ||
| + | :: - [https://halldweb.jlab.org/wiki-private/index.php/Crystal_Specifications Meeting with SICCAS] | ||
* Module fabrication | * Module fabrication | ||
| + | :: - [https://logbooks.jlab.org/entry/3930068 Beam test of the fabricated modules using PS setup] -- Sasha | ||
* COMCAL tests, TAC running, etc. | * COMCAL tests, TAC running, etc. | ||
* 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:
- http://jlab.bluejeans.com (You should only need to do this once)
- 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 "##"
- Dial: 1 888 240 2560 (US or Canada only)
- or, List of International Numbers
- If connecting via Polycom unit:
- Dial 199.48.152.152 or bjn.vc
- Enter meeting ID above
Agenda
- SICCAS crystals
- Module fabrication
- 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
