1. 10-Minute Overview of North American Tracking R&D Amsterdam LC Tracking Review March 30, 2003 Bruce Schumm/UC Santa Cruz

2. Background Three main R&D thrusts: Simulation Gaseous Tracking (TPC) Solid-state Tracking (  strips, Si drift) Support for Detector R&D Re-direction of effort of base program (discretionary) Generic R&D programs (`ADR’ program of US DOE) UCLC/LCRD consortia of (Natl Sci Foundation/Dept of Energy) University Groups; ~$1M in limbo

3. North American L Tracker

4. North American SD Tracker

5. Simulation Refine Tracker Requirements SUSY (central at Michigan, forward at UCSC) Explore Alternatives (not yet fully underway) TPC vs silicon drift All-axial central  -strip tracking Forward tracking scenarios With GEANT-based background included Tracking/Calorimeter Interface Issue Track-cluster matching Calorimeter-assisted VEE finding

6. Unique Hardware Proposals Scintillating fiber intermediate tracking layers Timing Pattern recognition Negative-ion TPC Low diffusion, high gain (single e - detection) Good quenching

7. Gaseous Tracking Several Canadian and US groups: Explore readout choice and design Gas selection (neutron backgrounds, diffusion) Compact electronics Test chambers Carleton Victoria Cornell (in production) GEM Production MIT (Microsystems Technology Laboratory) Louisiana Tech (proposed;  machining, laser drilling)

8. Solid-state Tracking Long Shaping-Time  -strip (Funded: DOE ADR program) Ultra-thin (momentum resolution, energy-flow) ASIC under development at UC Santa Cruz Long (2m) ladders under development at UCSC Silicon Drift R&D (Wayne State, Brookhaven) Intrinsically 3-dimensional Proven (STAR VTX detector at RHIC) Longer, thinner sensors; low-power readout Mechanical Issues Space frame Interferometric position monitoring (Michigan)

9. Solid State Tracking II Some New Developments: SiLC Group: International R&D consortium to address all aspects of Si tracking at a LC (exclusive of CCD’s) Large-area central tracker Si Envelope Forward tracking planes SLAC effort (with UCSC, others?) to flesh out long shaping-time central tracking option (`TDR-level’ study)  Simulation as well as hardware R&D

10. Summary Tracking R&D still considered to be wide-open Working towards wrapping up general R&D phase in ~3 years; choose between gaseous, solid-state options (maybe two detectors?) Funding remains tentative; awaiting release of $300-400 K for basic R&D Most of activity happening in context of strong and growing international consortia