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Comprehensive FLUKA Simulation for EAR2: Geometry, Neutron Fluence, and Results Analysis

This document outlines the FLUKA simulation conducted for the EAR2 project, detailing updates to geometry, neutron and charged particle fluence, and resolution analysis. The implemented geometry includes the n_TOF spallation target area, collimator specifications, and beam profiles. Results highlight neutron fluence comparisons with EAR1 and the effects of collimator modifications on resolution and beam profile. This simulation aims to optimize conditions for upcoming experiments in the pit area and supports future commissioning activities for enhanced particle detection and analysis.

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Comprehensive FLUKA Simulation for EAR2: Geometry, Neutron Fluence, and Results Analysis

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  1. FLUKA Simulation for EAR2 Weiss Christina & Vasilis Vlachoudis 14.04.2011

  2. Introduction • Geometry Update • Results • Neutron Fluence • Charged Particle Fluence • Resolution • Beam Profile FLUKA Simulation for EAR2

  3. Implemented Geometry

  4. n_TOFSpallation Target Area EAR2 (20 m from pit, above ground) To be built ISR Technical gallery (10 m from pit) Existing hole n_TOF target pit FLUKA Simulation for EAR2

  5. Beam dump Beam Dump EAR 2 EAR2 Collimator Collimator d = 32 cm Service Galery ø 32 cm Spallation target Flight path to EAR1 n_TOF Target n_TOF commissioning and experiments

  6. New Target in the Pit Opening on top of the spallation target structure  EAR2 TOF tube goes through there FLUKA Simulation for EAR2

  7. Changes in Geometry Neutron tube starts at the neutron target 1 cm Air 2-3 cm Water Bottom Tube square shape 2 - 4.8 cm Al FLUKA Simulation for EAR2

  8. Implemented Geometry Neutron Tube: • Bottom part in geometry of hole • Starting at1.5 m: round tube, inner diameter di= 32 cm • At 17 – 20 m collimator Collimator (R.Reifarth et al.: GEANT simulations): • 2 m of Iron in conical shape • 1 m borated Polyethylene with inner diameter dC = 8 cm FLUKA Simulation for EAR2

  9. Results

  10. Neutron Fluence FLUKA Simulation for EAR2

  11. Neutron Fluence Comparison Reference for EAR1 : FLUKA Simulations with fission collimator (d = 8 cm) FLUKA Simulation for EAR2

  12. Charged Particles & Photons under study FLUKA Simulation for EAR2

  13. Resolution without Moderator Log( ) FLUKA Simulation for EAR2

  14. Resolution without Moderator 0.5 < E < 5 eV 0.5 < E < 5 keV 0.5 < E < 5 MeV FLUKA Simulation for EAR2

  15. Resolution without Moderator 0.5 < E < 5 eV 0.5 < E < 5 keV 0.5 < E < 5 MeV FLUKA Simulation for EAR2

  16. Resolution ~ 9% Flux reduction FLUKA Simulation for EAR2

  17. Beam Profile at EAR2  Profile 1 m after Implemented Collimator Collimator Size FLUKA Simulation for EAR2

  18. Beam Profile Projection FLUKA Simulation for EAR2

  19. Details for other applications follow by E. Chiaveri

  20. Time Energy Relation for EAR2 FLUKA Simulation for EAR2

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