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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

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Background Workshop, 22 – 24 Sep 03

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  1. 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

  2. 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)

  3. 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

  4. In-depth review of radiation-abort policies (3) • SVTRAD upgrade plans • SVTRAD 1.5 • diamonds

  5. 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

  6. Harnessing the run-4 backgrounds (2) • Stored-beam tails • characterization/understanding • collimation

  7. 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?

  8. 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

  9. Background simulations & new IR design (2) • Beam-beam tails • existing packages (RS?) • Belle experience

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