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Testbeams for Tracking Prototypes

Explore issues in power cycling, signal/noise, resolution, and timing for solid-state tracking prototypes using testbeams. Discuss expected performance and resolution studies. Investigate beam profiles for optimal results.

thomaswatson
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Testbeams for Tracking Prototypes

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  1. Testbeams for Tracking Prototypes Two categories: TPC/Gaseous tracking – please chime in Solid-state (silicon strip) tracking – will present some issues to be explored with testbeams

  2. Solid-State Tracking Issues • Primary issues: • Power cycling • Signal/noise; efficiency and occupancy • Point resolution • Timing

  3. Power Cycling Beams are on for 1 msec five times a second  should be able to achieve power reduction of ~5x10-3 if power can be switched on/off in ~100 sec. Should be able to explore/confirm this on test bench  not a test beam issue.

  4. Timing Timing resolution should be very roughly shape/SNR Electronics with ~1sec shaping should achieve timing resolution of very roughly 100 nsec – can distinguish individual beam pulses BUT: Should also be able to explore/confirm this on test bench  also not a test beam issue.

  5. Pulse Development Simulation Long Shaping-Time Limit: strip sees signal if and only if hole is col- lected onto strip (no electrostatic coupling to neighboring strips) Incorporates:Landau statistics (SSSimSide; Gerry Lynch LBNL), detector geometry and orientation, diffusion and space-charge, Lorentz angle, electronic response

  6. Expected performance 167cm ladder, 300m thick sensors, normal incidence

  7. RMS RMS Gaussian Fit Gaussian Fit Resolution With and Without Second (Readout) Threshold Trigger Threshold 167cm Ladder 132cm Ladder Readout Threshold (Fraction of min-i)

  8. Non-normal incidence

  9. Discussion For strip tracking, resolution studies point towards stiff (10-50 GeV) beam with 1-cm2 beam profile and slow spill with ~104 Hz rate during beam spill Lower energy (~5 GeV) beam in high field (~5T) might be useful – would need to explore. Comments on gaseous tracking TB needs/points of cooperation?

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