Jul 2, 2015 Calorimetry
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Contents
Video Conferencing Information
Meeting Time: 11 a.m.
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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
-
Keep events reporting z outside the BCAL physical boundaries in the "curvature" reconstruction (Tegan) - Change BCAL and FCAL coordinates use the global coordinate system (not the target center). Action of this item is under discussion
- Understand BCAL efficiency estimates (cluster vs enhanced) for m7 and m8 data taking modes (Ahmed)
-
Check with David L. regarding geometry inconsistencies noted by George (Elton)George completed work but will work with David on implementation
References
Tentative Agenda
- Announcements
- Action Items
- Summer plans
- FCAL Update
- BCAL Update
- Calorimetry F250 Firmware Discussions
- Reconstruction and Simulation
- Calibration
- Any other business
- Testing
Minutes
Attendees: Manuel, Matt, Adesh, mark, Elton, Jon (JLab); Zisis, Tegan (UofR); George (Athens); Will, Mike, Curtis (CMU); Sean (NW)
- Announcements
- We have been asked to accelerate the schedule for providing slides to Eugene in preparation for the S&T review.
- Action Items
- FCAL Update
- Pedestal studies (Manuel)
- See Log Entry 3345115
- LED data investigating resolution for various sum combinations
- Mark: Would like to redo this studies for the BCAL. Manuel will send him his plugins.
- Pi0 calibration (Adesh)
- See Log Entry 3345029
- Plots pi0 mass as a function of the photon energies in 100 MeV bins.
- Dependence of pi0 mass fit as a function of photon energy is fit to various parameterizations.
- Data are used to understand FCAL non-linearities.
- Base firmware (Jon)
- New firmware allows more reliable and stable determinations of the voltage and currents.
- Firmware upgrades are complete.
- Scripts are ready by need testing. Hovanes has found one bug and testing continues before final implementation.
- Pedestal studies (Manuel)
- BCAL Update
- Waveforms (Elton)
- See Log Entry 3345085
- Shape of pulses differ somewhat between small and large pulses, in particular depth of dip after pulse. This fact needs to be considered as we work on firmware.
- Mark: Will start looking at pedestals and related issues with the BCAL starting next week. Will start by duplicating Manuel's analysis for the BCAL.
- Pi0 calibration (Will)
- Continues to optimize pi0 calibration by changing cuts on eigenvalues and initial gain factors
- Small improvements are found, with updated widths at about 8.5 - 9 MeV
- On shower fragmentation: asking for input on how best to move forward. This has been added to the action item list.
- Time calibrations (George)
- Use cosmic-ray data.
- Convergence of values for veff if there are selection cuts made on difference between z_cal - z_trk < 20 cm. This converges to about veff=17 cm/ns as expected. There is some concern about systematics from these selection cuts.
- Checked that selections are not very biased relative to position along the BCAL, but data is not very uniform so it is difficult to draw strong conclusions.
- Waveforms (Elton)
- Calorimetry F250 Firmware Discussions
- We have started discussions on the firmware bi-weekly. As questions are better defined, discussions will broaden to larger groups.
- Reconstruction and Simulation (Tegan)
- Latest changes are checked in and will be used for spring simulation runs
- Question: Should one change mcsmear to output digiits? David: Yes, this will allow gain factors to be treated in the same way in the real and simulated data.
- Sean: Should be shower curvature data included by default into simulations? Tegan: At the moment no, although it is checked in it needs additional testing.
- Any other business
- Testing