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Background Workshop, 22 – 24 Sep 03. 3 themes.... In-depth review of radiation-abort policies “make BaBar & PEP-II transparent to each other” Harnessing the run-4 backgrounds (operational issues) Long-term projections Experimental extrapolations Background simulations & new IR design

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background workshop 22 24 sep 03
Background Workshop, 22 – 24 Sep 03
  • 3 themes....
    • In-depth review of radiation-abort policies

“make BaBar & PEP-II transparent to each other”

    • Harnessing the run-4 backgrounds (operational issues)
    • Long-term projections
      • Experimental extrapolations
      • Background simulations & new IR design
  • ...in a wider context
    • PEP-II parameter projections (JS)
    • IR upgrade plans (MS)
    • machine-background experience @ Belle/KEKB
in depth review of radiation abort policies 1
In-depth review of radiation-abort policies (1)
  • SVT radiation hardness
    • damage mechanisms (slow, fast) & pain thresholds
    • measurement results; tests in progress/upcoming; uncertainties
  • Radiation exposure, past & future (mostly SVT, EMC)
    • accumulated dose to date, characterization (MID vs T/B, sources)
    • dose transfer pins  SVT
    • updated exptl projections on integrated dose (incl. underlying assumptions on injection etc)
    • comparison of pin dose rate vs current, normalized to extrapolations (idem DCH)
    • SVT maintenance/rotation scenarios
  • Beam-abort algorithms
    • stable beams: fast/slow
    • injection (inhibit/abort)
in depth review of radiation abort policies 2
In-depth review of radiation-abort policies (2)
  • Pushing the envelope: where are the hard limits?
    • what could SVTRAD change in its modus operandi (e.g. algorithms, thresholds, 1 or 2 beams) that woudl make life easier/more efficient?
    • how much reserve do we have in radiation budget?
    • what happens if we relax some threshold(s)? What are the implications for
      • detector damage (SVT, DCH, EMC)
      • integrated dose (SVT, EMC)
      • data quality (all)
  • Sharing the pain between running efficiency, detector integrated dose & BaBar data quality
    • what are data quality measures (e.g. ‘occupancy meter’ ?) in the various subdetectors?
    • x-calibration of data quality & pin-diode dose?
  • What questions/issues would PEP-II (AD/OPS) like to raise?
  • Belle experience
in depth review of radiation abort policies 3
In-depth review of radiation-abort policies (3)
  • SVTRAD upgrade plans
    • SVTRAD 1.5
    • diamonds
harnessing the run 4 backgrounds 1
Harnessing the run-4 backgrounds (1)
  • Radiation bursts
    • characterization
    • strategy
    • possible experimental/monitoring actions
  • Trickle injection
    • recent experience, open issues, work in progress
  • Injection backgrounds
    • characterization
    • strategy
    • possible experimental/monitoring actions
harnessing the run 4 backgrounds 2
Harnessing the run-4 backgrounds (2)
  • Stored-beam tails
    • characterization/understanding
    • collimation
experimental extrapolations 1
Experimental extrapolations (1)
  • extrapolation of ‘traditional’ backgrounds(in present geometry)valid 20xx ?
    • b* ==> Coulomb still OK?
    • can one extrapolate beam-beam backgrounds – at all?
  • any limitations/vulnerabilities in Babar hardware or physics performance?
    • SVT radiation hardness? SVTRAD reliability ?
    • bgd ==> power supply limitations? dataflow BW? p0 reco’tn ? tracking occup’cy?
background simulations new ir design 1
Background simulations & new IR design (1)
  • Synchrotron radiation (SR)
    • overview on new IR design
    • summary of past SR simulations for the SVT
    • status of SR simulations for new IR design
    • Belle experience
  • Beam-gas
    • goals & scope of present effort
    • Overview of simulation architecture
    • Summary of past background simulation studies (SVT, DCH; EMC?)
    • Status of Turtle decks
    • Status of GEANT-4 geometry implementation
    • First simulation results (if any)
    • strategy, plans, timeline, milestones
    • Belle experience
background simulations new ir design 2
Background simulations & new IR design (2)
  • Beam-beam tails
    • existing packages (RS?)
    • Belle experience
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