August 27, 2014 Calibration

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GlueX Calibration Meeting
Wednesday, August 27, 2014
11:00 am, EDT
JLab: CEBAF Center, F326

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Agenda

  1. Announcements
  2. Commissioning Planning
  3. Fall 2014 Commissioning Simulations
    • Status Update
      • Commissioning target geometry in branch hdds-commissioning

Commissioning target.png Commissioning target closeup.png

    • Number of Events & Final States
    • EM Background Simulations (Sean)
    • EM Background Simulations (Simon)
      • Mockup of Level 1 trigger:
        • Version A: (Ebcal + 4.0 Efcal)>=2.0 && Ebcal>0.200 && Efcal>0.030
        • Version B: (Ebcal + 4.0 Efcal)>=2.0 && Ebcal>0.030 && Efcal>0.030 && N(start counter hits)>0
        • Version C: Efcal>=0.250
        • Version D: Efcal>=0.250 && N(TOF hits)>0
      • Coherent bremsstrahlung generator: 10 GeV electron beam, 5 mm collimator, Emin=1.2 MeV.
   Events |                   Trigger               |           Events with segments
          |         A         B         C         D |          A         B         C         D

    97172 |       169        70        44        44 |        122        67        29        29 

Fraction: | 0.0017 0.0007 0.0005 0.0005 | 0.0013 0.0007 0.0003 0.0003


  1. Action Items
  2. AOT

Action Items

  • Update desired event counts (all)
  • Tag new sim-recon version (Mark I.)
  • Update geometry for commissioning running (Simon)
  • Obtain new constants for EM background simulation & magnetic field (Sean)
  • Update expected photoproduction event rate calculations
  • Decide number of events & conditions to simulate
  • Run simulations
  • What is the lowest solenoid current that we can run at? How will a low solenoid current affect FDC alignment?
  • Study FCAL & BCAL trigger thresholds