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CDC Scrutineer Talk

CDC Scrutineer Talk. Elliott Wolin GlueX Collaboration Meeting Jefferson Lab 9-Sep-2004. scrutineer n. a scrutinizer; specifically, an examiner of votes, as at an election. scrutinizer n : a careful examiner; someone who inspects with great care. Scrutineer?. Strategy.

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CDC Scrutineer Talk

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  1. CDC Scrutineer Talk Elliott Wolin GlueX Collaboration Meeting Jefferson Lab 9-Sep-2004

  2. scrutineer n. a scrutinizer; specifically, an examiner of votes, as at an election. scrutinizer n : a careful examiner; someone who inspects with great care Scrutineer?

  3. Strategy • Assume role of a skeptical reviewer • Present list of questions/concerns not covered in Design Report and in DocDB • Please add to my list!

  4. But first… • I find the project in good shape • Confidence in CMU to solve remaining problems • Only concern is effectiveness of dE/dx in magnetic field, with real preamps, etc.

  5. Skeptical Reviewer’s Concerns • Conceptual • Performance • Mechanical • Services (gas,electrical,hv,etc.) • Onboard electronics • Reconstruction and Analysis

  6. Conceptual • No VTX implies need for re-optimization of STC/CDC/FDC geometry • New Cerenkov implies reevaluation of dE/dx requirements • Is prototype plan adequate…need more? In B field? • Why not resistive wires? • If dE/dx not needed skip ADCs? Or drift?

  7. Performance • Look at other gases? CO2 - long pulse, pile-up? • Understand aging better • Understand Lorentz angle effects better • Effect of breakdown, broken wire? • Verify dE/dx works in B field • Gain variations vs V, wire sag, gas purity, etc. • Cross talk – straws, preamps, via HV, etc. • Rate effects – V sag, preamps, x-talk, heat, signal pile-up, etc.

  8. Mechanical • Verification of matl’s, glue, techniques • Glue lifetime – radiation damage, etc. • Failure mode analysis • How to repair? Time? Replace wire? • Survey, align requirements? Plan? • Supports, stability, deflections, vibration? • QC (clean,glue,crimp,tension) – students? • Al vs Cu vs Au? mylar vs kapton? • Metal coating thickness, skin depth? • Are compound angle problems under control? • Interfaces, keep out zones, installation plan?

  9. Services • Gas distrib, uniform flow, purity, cleaning? • Room for cables, services? Mass? • HV dist, granularity, currents, cable type? • Discharges - HV cap, resistor size calc? • Power, heat, noise, shielding, grounding? • Is temperature rise a problem? Gas flow rate?

  10. Onboard Electronics • Preamp design? • Preamp mounting, power, heat, x-talk? • Cable type, quality, thickness, max length? • Signal shape variations? Shaping?

  11. Reconstruction and Analysis • Calib plan – special runs? Survey reqs? • Pat rec – spiraling tracks, bad straws, showers, event pileup, x-talk, ambiguities, • Track fitting – mult. scatt, dE/dx, Kalman filter? • What if no tagger info?

  12. Conclusions • CDC project in good shape • Some open questions • Some tests still needed • CMU headed in the right direction • Seem to have enough time, people, $$? • “Reviewer’s” questions should be satisfied by adequate documentation of past work, and planned future work

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