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Simulations for EXL

Hossein Moeini, for the EXL Collaboration KVI- University of Groningen. Simulations for EXL. EXL setup at NESR. Gas-jet. Geometry by Andrei Zalite, Milano. beam. EXL Recoil Detector. Optimized Number of assemblies. Gas-jet. N = 12508 crystals. ≈ 111 assemblies needed.

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Simulations for EXL

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  1. Hossein Moeini, for the EXL Collaboration KVI- University of Groningen Simulations for EXL

  2. EXL setup at NESR Gas-jet Geometry by Andrei Zalite, Milano beam

  3. EXL RecoilDetector

  4. Optimized Number of assemblies Gas-jet N = 12508 crystals ≈ 111 assemblies needed η coverage ≈ 90º & exit hole ≈ 7º - 8º 11 assemblies in η-direction η => 9 or 11 in ψ-direction ? ψ 9 assemblies in ψ-direction

  5. Crystal separations in a ring when we divide the forward ball in 7 (triangles), 9 (squares), and 11 (circles)‏ assemblies for a range of 240º in ψ-direction.

  6. ESPA/EGPA Top View ;ψ-Assemblies 1 2 0 0 8 1 7 6 2 3 5 4 beam

  7. EGPA Forward Ball;ψ/η-Assemblies 10 9 Gas-jet 8 7 8 0 7 1 6 6 2 5 3 5 4 4 3 beam 2 1 0

  8. CPU-time/event for assemblized and not-assemblized EXL calorimeter time taken up for geometry optimization excluded Squares : assemblized calorimeter Triangles : not-assemblized calorimeter Empty signs : full calculation Full signs : tracking time

  9. gaps between neighboring crystals in a ring(ψ-direction)‏ Stars : assemblized geometries Squares : not-assemblized

  10. Efficiency calculated for randomly thrown protons in θ=[15º,35º] and Δφ=2π Full squares : all processes present Empty squares : in the absence of msc Triangles : in the absence of inelastic hadronic Circles : in the absence of msc and inelastic hadronic

  11. EXL Calorimeter Beam Alternative configuration Proposed configuration

  12. Triangles : backward part of calorimeter Squares : forward part of calorimeter

  13. Squares : forward part of calorimeter Triangles : backward part of calorimeter

  14. inelastic off msc & inelastic off msc off

  15. Energy Resolution for Protons for Region A 1mm ■ 0.5mm ▲ 0.1mm Δ No shell ┼

  16. EXL Full Geometry implemented in Geant4 Magnetic elements done by Masoud Shafiei, University of Tehran Beam

  17. Outlook Simulations for the EXL with the full geometry available could be performed. Alternative way of building the spherical calorimeter with comparable efficiency to the proposed geometry is possible. Technical design report, based on the simulations, will be ready for 2010.

  18. Assemblized Non-assemblized

  19. Efficiency calculated for randomly thrown protons in θ=[15º,35º] and Δφ=2π Stars : assemblized calorimeter Squares : not-assemblized calorimeter Empty signs : in absence of multiple scattering (msc)‏ Full signs : all physical processes present No silicon element and UHV shell in geometry

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