July 23, 2020 Calorimeter
From GlueXWiki
Meeting Time: 11:00 a.m. JLab time
- To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
- To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
- To join via phone, use one of the following numbers and the Conference ID: 907185247.
- US or Canada: +1 408 740 7256 or
- US or Canada: +1 888 240 2560
- Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
- More information on connecting to bluejeans is available.
Contents
Participant Direct Lines
- JLab Phone in CC L207 is 757-269-7084 (usual room)
- JLab Phone: in CC F326 is 757-269-6460
- Phone in the Regina Video-conference Suite is 306-585-4204
- Athens Phone: in Christina's office is 011-30-210-727-6947
References
- FCAL HDFCAL log book
- BCAL HDBCAL log book
- Calibrations: 2020 Data Production; RunPeriod-2019-11 Validation; Offline Monitoring Data Validation
Goals for Calorimetry Group
- Determine preliminary photon reconstruction efficiencies as a function of E, phi and theta in data and simulation with a point-to-point precision of at least 5%.
- Measure systematics of pi0/eta mass calibration as a function of detector position to a precision of at least 5 MeV.
- Demonstrate agreement of photon reconstruction efficiency and resolution between data and simulation as a function of E, phi and theta to within 5%.
Action Items
- Short Term:
- Checks of monitoring comments of Batch 5-8
- Timing checks: 72123-72416 (2ns peaks), 72417-72435 (time offset) -> Mark
- BCAL gains calibration constants (nominal 8 batches grouped in 4) -> Karthik
- Pedestal checks (Primex) -> Igal
- Magnetic field in BCAL: check energy calibration -> Mark
- Richard Jones' work on G3vG4: resolution at 60 deg
- LED occupancy hole investigations
- BCAL Wiki reorganization -> All
- Long term items
Tentative Agenda
- Announcements
- Action Items
- Run Update
- FCAL
- BCAL
- Calibrations
- Monitoring
- BCAL LED
- BCAL (offline)
- FCAL (offline) statusIII
- Reconstruction
- Efficiency
- Log 3815945 Costhe Eff (Elton)
- Simulations
- Discussion (Jon): splitoffs in MC: it has been brought up across several meetings that hadronic splitoffs may not be modeled in MC well, thus caution is recommended when cutting on number of unused showers. Is there a quick study we could do to point towards this? For FCAL: exclusive omega sample may work. For BCAL: hyperons??
- Any other business
Minutes
Attending: Tolga, Zisis, Sean, Mark, Elton, Colin, Susan, Varun, Jon, Churamani, Karthik, Igal, Rebecca, Matt
- Announcements
- Elton reported that the accelerator has issues (N. Linac) and beam will be delivered a week later than planned.
- Action Items
- Short Term
- Checks of monitoring comments of Batch 5-8 (see below)
- Mark made a log entry yesterday in connection to the timing checks. The average photon timing to 0 has been made for runs 71350 to 71591. He will check again after the next monitoring launch.
- Karthik is working on the "Group Batches" (=ones that have similar gains.) There are four of those. The last group (normal batches 7 and 8) are running and will be analyzed later today.
- Pedestal checks; use new gain calibrations, starting today.
- The magnetic field was off in the BCAL SciFi matrix for HGeant because is caused it to be slow; this does not matter for HDGeant4. Now the field is on for both. Mark verified that it does not affect the energy scale.
- There was a discussion connected to Richards' G3vsG4 work. Matt: are these the best observables? Acceptance is too complicated a variable. Shouldn't we use a monoenergetic particle gun and go back to basics? (Note HADR=1 and =4 are used only in HDGeant.) Sean: after event is reconstructed there is a big difference in the timing distributions between the two HADR options. It was agreed to do photon, pi+, pi-, p gun studies. WHO WILL DO THIS? Mark suggested that etapi-Delta++ is a good candidate to study the hadron timing. This differs from Alex's pi+pi-p (the rho).
- LEDs: Varun verified that SiPM M23 Layer 2 #6 is not functioning, by comparing that cell with old runs: the signal now is 1/2 of what it was when both SiPMs in the cell (#6 and #10) were firing. Elton: this is the first time we have a dead SiPM; we should consider knocking out this cell in ccdb. Electronics/FADC and amplifiers are functioning. It may be that the #6 cable is corroded or has a poor connection; this will be checked after the run. Also, Varun and Jon tool LED data towards the continued radiation damage study. Beni should be consulted as he is working on a similar study for the Start Counter.
- Elton mentioned that if more people contribute to the BCAL Wiki it will become a useful tool.
- Long term:
- Colin: Check this board; check the switch: maybe it is on the wrong scale. Check before the run.
- Mark: it is not obvious how to do this. Is it vital on the short term?
- Short Term
- Run Update
- FCAL
- BCAL
- Calibrations
- Monitoring
- BCAL LED
- BCAL (offline)
- FCAL (offline)
- Reconstruction
- Efficiency
- Simulations
- Any other business