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Status of Geant4 Veto Simulation

Status of Geant4 Veto Simulation. E.Leonardi, M.Serra, P.Valente INFN Roma NA48/3 Veto group meeting – April 20 th , 2005. Goals. Geant4 simulation of g large angle veto CKMCal : Lead/Scintillating tiles with WLS readout SpaCal : Lead/Scintillating fibers with lightguide readout

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Status of Geant4 Veto Simulation

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  1. Status of Geant4 VetoSimulation E.Leonardi, M.Serra, P.Valente INFN Roma NA48/3 Veto group meeting – April 20th, 2005

  2. Goals • Geant4 simulation of g large angle veto • CKMCal: Lead/Scintillating tiles with WLS readout • SpaCal: Lead/Scintillating fibers with lightguide readout • Use layout in Proposal E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  3. Geometry • CKMCal • Two veto rings, 16 trapezoids • Tile planes to beam axis • Tile planes staggered in  • Aluminum support enclosure • SpaCal • Fibers to beam axis • Aluminum support enclosure E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  4. CKMCal Aluminum Lead Scintillator 1 cm 1 mm Beam Axis 30 cm 27.75cm 42.5 cm Flat bottom face… E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  5. SpaCal Aluminum Lead Scintillator C-shape module straightened… 2.5 m 24 cm 29.9 cm 1 cm Beam Axis 1 mm E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  6. Geometrical Parameters • Aluminum support • Covers front, back, and bottom surfaces of brick • Thickness=0.1, 1, 0.1 cm • Fibers • KLOE-style hexagonal arrangement • =1 mm, Δx=1.35 mm, Δy=1.17 mm • ~70000 fibers/brick •  20 X0 • Tiles • 5 mm Scintillator, 1 mm Lead • 68 tiles/brick •  16 X0 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  7. CKMCal readout • 4 PMT’s per sector • 64 PMT’s per veto ring E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  8. SpaCal readout Winston lightguide • 4x4 or 4x6 PMT’s per side • 64 or 96 PMT’s per veto ring E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  9. Positions, q and E 1 2 3 4 5 small q 0.1 – 1 GeV small q 0.1 – 1 GeV large q 0.05 – 0.1 GeV large q 0.05 – 0.1 GeV E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  10. E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  11. Digitization: CKMCal • Ly=10 p.e./MeV • Conservative light yield from CKM measurements • Includes light production, attenuation, collection and conversion Np.e.=i ΔEi x Ly E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  12. CKMCal photoelectrons 100 MeV g, position 2 PMT 0 PMT 1 12 13 PMT 2 PMT 3 14 15 thr.=5 p.e. E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  13. CKMCal photoelectrons 100 MeV g, position 2 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  14. CKMCal photoelectrons 100 MeV g, position 2 13 12 PMT 3 PMT 2 PMT 1 PMT 0 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  15. CKMCal photoelectrons 100 MeV g, position 2 Slice 12 Slice 13 PMT 0 PMT 1 PMT 0 PMT 1 PMT 2 PMT 3 PMT 2 PMT 3 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  16. CKMCal p.e. No digi=49 events Highest photoelectron signal distribution Inefficiency vs. threshold E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  17. Digitization: SpaCal • L=25 ph/MeVLight production • =320 cmLight attenuation length • C=0.93Light-guide efficiency • Q=0.2Photocathode quantum efficiency Np.e.=i ΔEi x L x exp(-di/) x C x Q L and  for Kuraray SCSF-81 from A.Antonelli et al. NIM A 370 (1996) 367 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  18. SpaCal photoelectrons 100 MeV g, position 1 100 MeV g, position 2 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  19. Results CKMCal veto 1 veto 0 SpaCal veto 1 veto 0 E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  20. CKMCal 1 2 3 4 5 small q SpaCal N=105g E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  21. CKMCal 1 2 3 4 5 large q SpaCal N=105g E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  22. CKMCal 1 2 3 4 5 small q No significative change going from 1 to 5 GeV N=105g E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  23. (Old) ToDo list 1 • More statistics from 104 to 105 events(OK?) • More test configurations • More points on brick (bottom surface) OK • More realistic photon beam OK (for SpaCal) • Energy/Angular distribution? Yes... still rough • Improve geometry/set-up • Use multiple phototubes per brick OK • Add separationlayer (adjacent bricks) Not yet… • Improve light collection/digitization realistic parameters, but not yet full digitization E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  24. (Old) ToDo list 2 • More complex setup • Add more bricks along the beam axis 2 rings now…(OK? easy to add more) • Use real brick shape OK (for TileCal) • Test different layouts to optimize detector efficiency • Pb/Sci ratio Not yet…but now ready • Aluminum thickness OK? • Read-out Not yet…but now ready E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

  25. (New) ToDo list 3 • Use FLYO output as g-beam gun (z along tube, q, E) • Compare with existing data? E.Leonardi, M.Serra, P.Valente - NA48/3 Veto Group Meeting

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