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Thoughts on B-Field Uniformity for the SD Tracker

Thoughts on B-Field Uniformity for the SD Tracker. SID Tracking Meeting October 22, 2004 Bruce Schumm UC Santa Cruz. Thanks to Harry Weerts!. March 2001 Baseline. Gaseous Tracking: spec is (I believe) B r /B z < 10 -3 What is corresponding spec for Si tracking?. Sources of concern:

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Thoughts on B-Field Uniformity for the SD Tracker

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  1. Thoughts on B-Field Uniformity for the SD Tracker SID Tracking Meeting October 22, 2004 Bruce Schumm UC Santa Cruz Thanks to Harry Weerts! March 2001 Baseline

  2. Gaseous Tracking: spec is (I believe) Br/Bz < 10-3 What is corresponding spec for Si tracking? • Sources of concern: • Pattern recognition and curvature reconstruction (will not address) • Pulse development (will address)

  3. 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

  4. Faking the Magnetic Field Michael Young, UCSC Resolution slightly better for lower Bfield Resolution Magnetic Field (T) Different B-Fields (B-field) or detector tilt to simulate Lorentz angle (Tilted)

  5. Efficiency versus Track Angle Michael Young, UCSC Efficiency won’t fall off as fast with track angle  Need to tilt detectors to regain efficiency? (but this is for =10, =90 – worst case)

  6. What do the experts (ATLAS, CMS) say? (Thanks to Alex Grillo, ATLAS) ATLAS has a 2T solenoidal field In the farthest reaches of their Si tracking, Br/Bz 5%, so Br  0.1T. If this spec is driven by relative considerations, then this is a 5% requirement. If spec driven by absolute considerations (Br < 0.1T), then this is a 2% requirement. WHAT ABOUT CMS?

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