Nov 24, 2008 Calorimetry
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Contents
Items for followup from Oct 27 meeting
- Updates on Calibration Specification Table.
- Resolution studies (Blake)
- Develop criteria for evaluating resolution studies
- Study impact of inactive material at the end of Bcal on acceptance.
- Add F100 rad hard glass to simulation. - New graduate student has been assigned this project.
- Add roadmap for Bcal Roadmap to wiki (Elton)
- Check what configuration (thresholds, step sizes, stack? parameters for secondaries, etc) is being used for the Hall D simulations (Regina)
- Updated schedule with new Fcal procurement dates. (Elke will send this to Matt)
- Report on the Bfield components in the region of the Bcal reaout (JLab for next meeting).
- Updated drawings of Bcal modules (including O-ring) for discussions. Tim will see if that can be fitted into designer tasks.
Documents to Review
- Calibration/monitoring update Athens: Media:APD_vs_tube_linearity.ppt
- For components of the magnetic fields see GlueX-doc-912, Figures 9 and 11.
- APD Material for Serguei's presentation: [1],[2],[3]
Tentative Agenda
- Announcements
- Calibration
- Progress on filling in the Calibration Specification Table.
- FCAL
- Report of timing studies with pmts and time calibration (Jake Bennet) [PDF slides]
- Approximations of the sqrt( -ln( x) ) function for the timing algorithm (Mihajlo): [T50 expansion]
- Discussion with C. Cuevas & Co.
- BCAL
- BCAL readout
- Resolution studies
- BCAL Construction MOU
- SiPM progress
- Readout
- Review of use of APDs for readout -- see material in 'Documents to Review' above (Serguei)
- Magnetic Field Update (JLab)?
- Any other business
Minutes
Attending: Fern, Hai, Ben, Ed, Chris, Elke, Serguei, Beni, Elton (JLab), Claire, Mihajlo, Jake, Matt (IU), Will (Chile), Christine (Athens), George, Andrei, Blake, Zisis (Regina)
- Followup items:
- No new updates to Calibration table, but this will be revisited in December.
- Resolution studies: see Blake's update below.
- F100 glass: in progress.
- Roadmap looks fine. Zisis and George went over it and have nothing to add.
- Hall-D simulations and configuration: in progress.
- FCAL procurement schedule: Matt and Elke are working on this offline.
- BCAL BField report: postponed to Dec 8 meeting.
- BCAL drawings: special meeting schedules for Dec 2.
- Calibration/Monitoring System: (see above link for PPT presentation). Christine gave us the highlights.
- Much work has been done in trying to suppress noise from the IU laser (used at 2 pulses/sec). The laser is also somewhat unstable in intensity (the Burle 8575 PMT also); Matt confirmed this from E852 experience, and added that the beam spot also tends to walk. Matt will try to dig up more info if available.
- Ratio of central/side hole for PMT is ~4 and for APD ~3. Non-linearity at high light output was seen. Light has a wider pulse for the central hole.
- Temperature instability is also a concern.
- Plan to use a FM PMT instead of the Burle one for better linearity.
- FCAL
- BCAL
- rest of minutes are in the pipeline... ZP