Dec 22, 2008 Calorimetry
From GlueXWiki
Teleconference Time: 11:15 EST/10:15 CST
- Phone:
- +1-800-377-8846 : US
- +1-888-276-7715 : Canada
- +1-302-709-8424 : International
- then enter participant code: 39527048# (remember the "#")
Items for followup from Dec 7 meeting
- Resolution studies (Blake)
- Develop criteria for evaluating resolution studies
- Study impact of inactive material at the end of Bcal on acceptance.
- Check what configuration (thresholds, step sizes, stack? parameters for secondaries, etc) is being used for the Hall D simulations (Regina)
- Report on the Bfield components in the region of the Bcal readout (JLab for next meeting).
- Options for vendors delivering specific lead sheet sizes (Tim)
Documents to Review
Tentative Agenda
- Announcements
- FCAL Update
- BCAL Update
- Resolution studies (Blake)
- SiPMPlus uniformity results (George/Zisis)
- see images under 'Documents to Review'
- Magnetic Field Update (JLab)
- Kuraray Visit (Elton)
- GlueX collaboration meeting
- Any other business
Minutes
Attending: JLab:Elton, Fernando, Tim; UofR: Andrei, Blake, George, Zisis; USM: Will; IU: Matt.
- FCAL Update
- Developed draft construction schedule, iteration with Elke and Tim
- Joh is building 64 element prototype. Welding straps, magnetic shield tubes. Next semester student starts to work on assembly and QA. Gluing fixture under construction
- Completing analysis on FCAL timing, with goal of NIM paper
- Claire is working on calibration, estimating required statistics for accurate calibrations. Likely presentation at next collaboration meeting.
- BCAL Update
- Resolution studies (Blake)
- Poor calibration for last 20 cm of Bcal
- Calibration data, coverage in angle and 0-4 GeV in photon energy. Take slices in z and fit cluster energy as a function of thrown energy.
- George: Should one fit over the entire energy range, since most photons are a lower energies?
- Will: Use model to correct for leakage, using appropriate functional form (not polynomial) for calibration.
- Matt: Try to improve reconstruction code, especially for those showers that do not have all cells firing on far side. Use single-sided pulses to compute energy and few hits on far side to determine position. This would result in a 2-pass approach, first to find clusters with substantial energy deposition in both ends of the calorimeter and then recovering showers with limited detection on one side.
- SiPMPlus uniformity results (George/Zisis)
- see images under 'Documents to Review'
- Baseline shift of 30 mV when bias applied
- signal exhibits oscillatory behavior, not seen in the electronic boards.
- Low pulses, UofR to check gain required. Laser providing 10^5 photons/pulse.
- Magnetic Field Update (JLab)
- Kuraray Visit (Elton)
- Resolution studies (Blake)
- GlueX collaboration meeting
- Any other business