Revision as of 14:37, 30 June 2016

Video Conferencing Information

Meeting Time: 12:00 p.m.

1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
2. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
3. 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
4. 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.
5. More information on connecting to bluejeans is available.

Participant Direct Lines

• JLab Phone: in CC F326 is 757-269-6460 (usual room)
• JLab Phone in CC L207 is 757-269-7084
• Phone in the Regina Video-conference Suite is 306-585-4204
• Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

References

1. FCAL HDFCAL log book
2. BCAL HDBCAL log book
3. BCAL Action Items and Working Tasks

Tentative Agenda

1. Announcements
2. Action Items
3. Preparation for REST production
4. FCAL non-linear shower corrections update
5. BCAL update
6. Calibrations
   1. Z-Dependance in the Time Calibration of BCAL (Andrei)
   2. Michel electron update
7. Reconstruction and Simulation
   1. Neutron efficiency
8. Any other business

Minutes

Attendees: Elton, Jon, Adesh, Mark (JLab); Zisis, Ahmed, Andrei, Tegan, Colleen (UofR); Curtis (CMU); Sean (NW); George (Athens); Maria (MIT);

1. Announcements
   • Manuel Lara is defending his thesis today.
2. Action Items
3. Preparation for REST production
   • Adesh: Preparing non-linear constants for FCAL for upcoming launches. Need one set for each of the two sets of HV settings.
4. FCAL non-linear shower corrections update
   • Use symmetric showers (shower energies close to each other) from pi0 decays
   • Non-linear corrections set to 1 up to now
   • Parameterization is a piece-wise correction with linear fit (<1.5 GeV) and exponential (>1.5 GeV)
   • After correction a scale factor of about 1.005 needs to be applied to the data.
   • MC resulted in pi0 peak at about 90 MeV when new non-linear corrections were applied. This was due to the fat that the original non-linear correction included a scale factor in addition to an energy dependent correction.
   • Fix to MC includes introduction of a scale factor (~1.3) and new parameterization.
   • Non-linear parameterization for MC uses only an exponential. This is included in the program by adding a parameter for the transition between linear and exponential functions (set to 0 for MC, set to 1.5 GeV for data)
   • Adjusted per block energy threshold (reduced by about 20 down to 13 MeV).
   • Code changes needed to be made to match the parameter additions to CCDB. These have been completed and ready for next launch.
   • Long-term plan for matching MC and data non-linear behavior is to have the MC output digi-hits. This will allow using gain calibrations in MC, similar to the way it is done for data (using pi0 calibration). Matt will work on this.
   • Next effort will be to determine timing offsets.
   • Mark: How is this done? Answer: Use global fit to match timing of adjacent hits in a single shower. Mark: Check that low-energy hits are excluded from calibration sample.
5. BCAL update
6. Calibrations
   1. Z-Dependance in the Time Calibration of BCAL (Andrei)
      • Use charged and neutral hits to develop time-walk corrections
      • Finds consistent parameters for both charged (pions) and neutral hits.
      • To find optimal timing, need also to make position dependent corrections
      • Check
   2. Michel electron update
7. Reconstruction and Simulation
   1. Neutron efficiency
8. Any other business