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

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?

LAYERRADIUSTHICKNESSS/N I :1 II :1 III :1 IV :1 V :1 VI :1 VII :1 VIII :1 Exploit tapering layer thickness; S/N somewhat conservative, at least according to current thinking.

LAYERRADIUS% of X 0 I II III IV V VI VII VIII TOTAL3.65 (2.95 active) Note: Assumption is (ala Bill Cooper) 0.2% X 0 of mechanical support per layer

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