Background workshop 22 24 sep 03
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Background Workshop, 22 – 24 Sep 03 PowerPoint PPT Presentation


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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

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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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