Simulations Request Jim Thomas Lawrence Berkeley National Laboratory

Simulations Request Jim Thomas Lawrence Berkeley National Laboratory August 2 nd, 2007 JT 1

Efficiency Calculations will Depend on Pileup P(good) = 1 / (1+S) where S = 2 x y P(bad) = (1 – Efficiency) = S / ( 1 + S ) and when S is small P(bad) 2 x y x is the convolution of the detector resolution and the projected track error in the ‘x’ direction, y is the convolution of the detector resolution and the projected track error in the ‘y’ direction, and is the density of hits. The largest error dominates the sum JT x = ( 2 xp + 2 xd ) y = ( 2 yp + 2 yd ) Asymmetric pointing resolutions are a challenge 2

Pileup – critical to selling the proposal • A modest proposal – Proposal geometry and configuration (TPC+SSD+IST 2+PXL 1) – with pileup – without – Reduced configuration with standard geometries (TPC+SSD+PXL 2+PXL 1) – with pileup – without Does Pileup Matter? Does the configuration matter? JT 3

A Prediction – pileup doesn’t matter for a 200 sec detector JT • Proposal configuration with pileup and UPC electrons • Proposal configuration without pileup and without UPC electrons 4

The details … vtx pxl 1 pxl 2 ist 1 ist 2 ssd tpc end k. Blue Radius Thickness Point. Res. On. Z 0. 230 0. 0100 1002 1210 0. 170 0. 0075 150 737 0. 120 0. 0075 288 169 0. 070 0. 0028 121 358 0. 025 0. 0028 58 82 Det. Res 27 11520 17 9 9 Det. Res. Z 778 17 5760 9 9 Density Efficiency 0. 21 0. 98 0. 39 0. 83 0. 77 0. 93 8. 34 0. 98 61. 35 0. 98 The hit densities on PXL 1 & PXL 2 are 61. 3493 & 8. 34069 per cm**2. The single track pointing resolution at 755 Me. V is 37. 695 microns in R-Phi and 41. 9188 microns in Z. The single track efficiency (all layers combined) is 72. 5136 percent. The table does not include the TPC & SSD acceptance which is assumed to be 75 percent for both detectors combined. vtx pxl 1 pxl 2 ist 1 ist 2 ssd tpc end k. Red Radius Thickness Point. Res. On. Z 0. 230 0. 0100 1002 1210 0. 170 0. 0075 150 737 0. 120 0. 0075 288 169 0. 070 0. 0028 121 358 0. 025 0. 0028 58 82 Det. Res 27 11520 17 9 9 Det. Res. Z 778 17 5760 9 9 Density Efficiency 0. 21 0. 98 0. 39 0. 83 0. 77 0. 93 2. 83 0. 99 22. 15 0. 99 The hit densities on PXL 1 & PXL 2 are 22. 1544 & 2. 82581 per cm**2. The single track pointing resolution at 755 Me. V is 37. 695 microns in R-Phi and 41. 9188 microns in Z. The single track efficiency (all layers combined) is 74. 4133 percent. The table does not include the TPC & SSD acceptance which is assumed to be 75 percent for both detectors combined. JT 5