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Detector WG

Detector WG. Francesco Forti SuperB Workshop LNF, 16-18 March, 2006. A SuperB Detector. Basic conclusion from December Workshop: It is possible to reuse large parts of Babar and Belle with relatively minor technology changes Detector components

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Detector WG

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  1. Detector WG Francesco Forti SuperB Workshop LNF, 16-18 March, 2006

  2. A SuperB Detector • Basic conclusion from December Workshop: • It is possible to reuse large parts of Babar and Belle with relatively minor technology changes • Detector components • Silicon vertex, with small radius pixels, essential for reduced boost. • Drift chamber • DIRC style PID, with improved readout • CsI(Tl) calorimeter in barrel, something faster (LYSO) in endcap • Existing coil • LST style muon detectors F.Forti - Detector WB

  3. Issue number 0 • Beam parameters • Current and Collision frequency vary wildly in different designs • Was mA and 1MHz in december • Raimondi – Round with extraction: 100 mA and 10 MHz • Raimondi – Flat(3) uncompressed: 1600mA and 500 MHz • Seeman – 4500 mA and 68 MHz • Different options have very large impact on technology choices and on the reusability of Babar and Belle components. F.Forti - Detector WB

  4. Collision frequency • With 0.1-1MHz fc one could exploit the beam crossing time structure to relax detector constraints • Drift time • Electronics shaping time • Crystal decay time • One the other hand a low fc implies overlapping events (mainly Bhabha) • The 10-50MHz regime is the LHC electronics area • It might be possible to exploit the bx time structure, but is it useful ? • At high fc (>100MHz) back to current BFactories operation mode • Continuous beam, no bx information • no pileup F.Forti - Detector WB

  5. Current • Two consequences of higher currents: • higher background in the detector • occupancy • radiation damage • power dissipation in the beampipe requires water cooling • more material • larger radius F.Forti - Detector WB

  6. Types and level of backgrounds • Beam gas • Synchroton radiation •  Both proportional to current • Should not be a problem at Superb • They become a problem at higher currents • Luminosity sources (eg radiative Bhabhas) • Careful IR design. Bhabhas into the detector are there. • Beam-beam interactions • Potentially important • Touschek background • 1/E2. Improves with smaller asymmetry. But, much higher beam density • Thermal outgassing • Due to HOM losses. Not an issue with small currents • Injection background • Not an issue because of damping rings scheme • Maybe not true anymore with the 1 collision/turn scheme • Bursts • Due to dust. No real cure. Need robustness of detector F.Forti - Detector WB

  7. Background bottom line • Probably reasonable to assume background is not larger than what with have today • Cannot claim a large background reduction with present schemes • Need to design a robust detector with the enough segmentation and radiation hardness to withstand surprises (x5 safety margin) • IR design is critical • Radiative Bhabhas • Syncrotron radiation shielding • Shielding from beam-beam blow up F.Forti - Detector WB

  8. Issue number 1 • Boost • lower boost advantegeous for machine design • Babar: 9 + 3.1 βγ=0.56 • Belle: 8 + 3.5 βγ=0.45 • SuperB?: 7 + 4 βγ=0.28 • we can afford to have a lower boost only if the vertexing resolution is good: • small radius beam pipe • very little material in b.p. and first layer • if not, then we should stay with higher boost (0.45) F.Forti - Detector WB

  9. Separation significance • <Dz>/s(Dz) vs bg F.Forti - Detector WB

  10. Detector components • Vertexing • Thin pixel layer glued on beam pipe • Good aspect ratio for small radius (compared to strips) • Improves patter recognition robustness • needs R&D • Intermediate tracking • Strip detectors • More or less like the current detectors • Reduction in thickness would be desirable, but not essential • Central tracking • Drift chamber • Solid state tracking not performant at low momentum • Need to optimize cell size against occupancy • Belle has developed a fast gas small cell DCH, but with a degraded resolutions F.Forti - Detector WB

  11. Detector components • PID • Čerenkov based PID – like DIRC • Need development on readout • Fast focusing DIRC • TOP • Endcap region requires special study • Calorimeter • Barrel part could be reused (see other talks) • In the endcaps require smaller Moliere radius and faster crystals  LYSO • Higher currents and smaller Bhabha pileup may change this conclusion • Muon • It doesn’t seem to be a problem • Trigger/DAQ • Calorimeter and/or tracking information • Not substantially different from current schemes. F.Forti - Detector WB

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