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Simulations for EXL Hossein Moeini, for the EXL Collaboration KVI- University of Groningen
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EXL setup at NESR Gas-jet beam Geometry by Andrei Zalite, Milano
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EXL Recoil Detector
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Optimized Number of assemblies N = 12508 crystals ≈ 111 assemblies needed η η coverage ≈ 90 º & exit hole ≈ 7 º - 8 º 11 assemblies in η-direction => 9 or 11 in ψ-direction ? 9 assemblies in ψ-direction Gas-jet ψ
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Crystal separations in a ring when we divide the forward ball in 7 (triangles), 9 (squares), and 11 (circles) assemblies for a range of 240 º in ψ-direction.
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ESPA/EGPA Top View ; ψ-Assemblies 0 1 2 0 1 2 3 4 5 6 7 8 beam
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EGPA Forward Ball ; ψ/η-Assemblies beam Gas-jet 0 1 2 3 4 5 6 7 8 10 9 8 7 6 5 4 3 2 1 0
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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
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gaps between neighboring crystals in a ring (ψ-direction) Stars : assemblized geometries Squares : not-assemblized
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Efficiency calculated for randomly thrown protons in θ=[15 º,35 º ] 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
![Efficiency calculated for randomly thrown protons in θ=[15 º,35 º ] 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](http://images.slideplayer.com./16/5234211/slides/slide_11.jpg "Efficiency calculated for randomly thrown protons in θ=[15 º,35 º ] 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")
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EXL Calorimeter Beam Proposed configuration Alternative configuration
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Triangles : backward part of calorimeter Squares : forward part of calorimeter
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Triangles : backward part of calorimeter
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msc off msc & inelastic off inelastic off
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Energy Resolution for Protons for Region A 1mm ■ 0.5mm ▲ 0.1mm Δ No shell ┼
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Magnetic elements done by Masoud Shafiei, University of Tehran implemented in Geant4 Beam
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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.
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Non-assemblized Assemblized
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Efficiency calculated for randomly thrown protons in θ=[15 º,35 º ] 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
![Efficiency calculated for randomly thrown protons in θ=[15 º,35 º ] 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](http://images.slideplayer.com./16/5234211/slides/slide_23.jpg "Efficiency calculated for randomly thrown protons in θ=[15 º,35 º ] 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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