1. Beam Background and Detector Layout 4th Concept Collaboration Meeting FNAL 19-20 October 2006

2. VXD Layout (SiDMay06)

3. The Issues SiD’s VXD and Beam Pipe is optimized for 5 Tesla B field Beam optics requires for the TPC r in > 20.5 cm

4. The angles involved TPC & BP (10°) DREAM (6.5°) VXD B (13°)VXD B (12°)

5. The Numbers Involved  (rad) P t (3.55 T) GeVP t (5 T) GeV TPC0.0770.250.35 VXD Barrel0.110.0150.021 VXD Endcaps0.100.0170.024 Beam Pipe0.0960.0130.018 Dream Endcaps0.0670.360.50 Small exercise using eq. Motion of particle in B-Field

6. Would it be a Problem? Much will depend on ILC parameters

7. USSC beam parameters TPC TPC VXD Barrel VXD Endcaps VXD Endcaps Beam Pipe Beam Pipe DREAM DREAM Generic (4Tesla) Generic (4Tesla)

8. It will be for High Luminosity colored dots is 10cm detector at r=1.5 cm for 3,4,5 Tesla TPC TPC VXD Barrel VXD Endcaps VXD Endcaps Beam Pipe Beam Pipe DREAM DREAM Generic (4Tesla) Generic (4Tesla)

9. Need a Simulation for B=3.5 Tesla Need a full simulation –3.5 tesla (for 4th Concept) –5 Tesla (for our exchange program with FNAL) Files available at SLAC (stdhep) D. Barbareschi will do that