1. Thoughts on an 8-Layer Microstrip Tracker SID Tracking Meeting October 8, 2004 Bruce Schumm UC Santa Cruz March 2001 Baseline

2. With 8 layers, tracker is nearly continuous (by some people’s Standards) What kind of momentum resolution could this get? What kind of pattern recognition performance? Kinks and Vees? Degradation of informa- tion before calorimeter?

3. LAYERRADIUSTHICKNESSS/N I2015024:1 II3515017:1 III5020017:1 IV6520014:1 V8025015:1 VI9530015:1 VII11030014:1 VIII12550020:1 Exploit tapering layer thickness; S/N somewhat conservative, at least according to current thinking.

4. LAYERRADIUS% of X 0 I200.35 II350.35 III500.40 IV650.40 V800.45 VI950.50 VII1100.50 VIII1250.70 TOTAL3.65 (2.95 active) Note: Assumption is (ala Bill Cooper) 0.2% X 0 of mechanical support per layer

5. Eight-Layer Gossamer Tracker Most precise design for p   Cross-over with ‘Fantasy Tracker’ at 90 GeV/c Cross-over with TPC at 10 GeV/c