1. Tungsten-Silicon Luminosity Detector with Flat Geometry Ronen Ingbir Tel Aviv University High Energy Physics Experimental Group

2. Detector Design 0.34 cm Tungsten 0.31 cm Silicon Cell Size 1cm*1cm 1 Radiation length 1 Radius Moliere Tel Aviv University High Energy Physics Experimental Group 15 cylinders * 24 sectors * 30 rings = 10800 cells

3. Tel Aviv University High Energy Physics Experimental Group Detector placement Tel Aviv University High Energy Physics Experimental Group 3.05 m 8 cm 28 cm

4. Tel Aviv University High Energy Physics Experimental Group Shower position Readout Cylinders position (cm)Rings position (cm) Sectors position (deg) Tel Aviv University High Energy Physics Experimental Group 250 GeV

5. Bhabha Scattering Tel Aviv University High Energy Physics Experimental Group BHWIDE MC Simulation +

6. Tel Aviv University High Energy Physics Experimental Group Bhabha MC output Tel Aviv University High Energy Physics Experimental Group Photon Number Photon Energy (GeV) Positron Energy (GeV) Electron Energy (GeV) Mean = 2.3 250 GeV

7. Tel Aviv University High Energy Physics Experimental Group Detector Simulation Tel Aviv University High Energy Physics Experimental Group Barbie -Geant 3.21 which includes detector description for Tesla detector The MC of physical process is the output of bhabha scattering The Barbie program was given us by Leszek Suszycki

8. Tel Aviv University High Energy Physics Experimental Group 100 GeV 250 GeV Mean 312.9 Mean 312.5 Z rec (cm) Mean 313.2 400 GeV Shower Z profile Z rec (cm)

9. Tel Aviv University High Energy Physics Experimental Group Detector Energy Readout Tel Aviv University High Energy Physics Experimental Group 100 GeV 250GeV 400 GeV Cut = Beam Energy * 0.014

10. Tel Aviv University High Energy Physics Experimental Group Energy Resolution & Calibration Tel Aviv University High Energy Physics Experimental Group Beam energy = 62.32 * Detector Energy + 0.36

11. Tel Aviv University High Energy Physics Experimental Group Angular weighting Tel Aviv University High Energy Physics Experimental Group Rec - Gen (rad) Rec - Gen(deg) Mean 0.2961E-03 Sigma 0.5809E-03 Mean –0.2361 Sigma 3.240 Mean 0.0975E-04 Sigma 0.2167E-03 Mean –0.7009 Sigma 1.917 250 GeV

12. Tel Aviv University High Energy Physics Experimental Group Angular Resolution 0.2E-03 0.035

13. Tel Aviv University High Energy Physics Experimental Group Acceptance with old geometry Tel Aviv University High Energy Physics Experimental Group Acceptance >30mrad

14. Tel Aviv University High Energy Physics Experimental Group Cuts with New Geometry and bhabha MC Tel Aviv University High Energy Physics Experimental Group Energy (Gev) 250 GeV No cuts energy and angle cuts gen (rad) rec (rad) gen (rad) rec (rad)

15. Tel Aviv University High Energy Physics Experimental Group New Acceptance 28 mrad Tel Aviv University High Energy Physics Experimental Group Rec - Gen Rec Gen Gen (rad) Rec (rad)

16. Tel Aviv University High Energy Physics Experimental Group Detector depth Tel Aviv University High Energy Physics Experimental Group

17. Optimization Tel Aviv University High Energy Physics Experimental Group Num. Cylinders 14 28 56

18. Tel Aviv University High Energy Physics Experimental Group Background studies Tel Aviv University High Energy Physics Experimental Group we included in the BHWIDE a background simulation routine called CIRCE. This was suggested to us by K. Moning

19. Tel Aviv University High Energy Physics Experimental Group Background-1 1%

20. Tel Aviv University High Energy Physics Experimental Group Background-2 Tel Aviv University High Energy Physics Experimental Group Num Photons =1.9 1% 3%

21. Tel Aviv University High Energy Physics Experimental Group Background-3 Tel Aviv University High Energy Physics Experimental Group Pos(rad) Ele(rad) Pos(rad) Ele(rad)

22. Tel Aviv University High Energy Physics Experimental Group Background-4

23. Next Steps….. A.Analyses of detector + background MC B. Cross checks in Geant 4 C. Energy and Angular resolution improvement. Tel Aviv University High Energy Physics Experimental Group