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by students Rozhkov G.V. Khalikov E.V. scientific adviser Iyudin A.F.
The simulation of the detector of photons and neutrons in the MEGAlib software environment by students Rozhkov G.V. Khalikov E.V. scientific adviser Iyudin A.F.
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Plan Main idea of simulation Software Geometry
Experiment implementation Results obtained for photons Results obtained for neutrons Conclusion
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Main idea of simulation
Full and comprehensive study of the instrument work Main goals: 1. To obtain energy and angular characteristics of the instrument 2. To probe various geometrical configurations 3. To explore the possibility of determination of particle parameters 4. To study the operation of the instrument under conditions close to real Main objectives: 1. Modeling of the geometry of the instrument and its physical and chemical features 2. Simulation of the instrument 3. Analysis and interpretation of the obtained data
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The MEGALIB software package
Geant4 Geomega Cosima Simulation interface Revan library Sivan library Mimrec library The MEGALIB software package
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Geometry of the detector
The detector as a whole (imager, calorimeter, anticoincidence shielding). Relative orientation of the successive layers of fiber strips
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Table 1: The geometry and structure of the instrument.
Part of an instrument Sizes of a component, mm Chemical composition Number of components Overall dimension, mm Estimated mass, g 3D Strip detector 138х1,5х1,5 (core) HC (Polystyrene) 86х61 140х140х100 1348, 97 138x1,56x1,56 (envelope) PMMA (Acrylic, C5O2H8) 322, 89 Calorimeter 14х14х30 LaBr3(Ce) 10х10 140х140х30 140х14х30 Millipore (C6O5H10) 10 114.15 Aluminium 1 12.64 Anticoincidence shielding 2:10х138х99 2:10х159х99 1:159х159х10 HC 5 - 1263, 98 Instrument as a whole 3 140х140х168,82
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Experiment implementation
An example of the single Compton scattering. An example of the single electron-positron pair creation.
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Experiment implementation
Examples of elastic (on the left) and inelastic (on the right) scatterings of initial neutron beam in the strip detector.
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Results obtained for photons
5 MeV 50 MeV 1 MeV 10 MeV 100 MeV Analyzed spectrum of incoming photons for different initial energies (1 MeV up to 100 MeV) 2 MeV 25 MeV
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Distributions of Compton scattering angles
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The angular resolution measure
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Reconstructed image of the source
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The relationship between angular resolution and initial energy of the photons
The FWHM of ARM or the instrument dependence of the initial energy of photons
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Energy dependencies of detection, triggering efficiencies and initial parameters reconstruction
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Detector energy response
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Results obtained for neutrons
c Spatial energy distribution in the detector, ‘a’ - for initial neutron energy of 1 MeV, ‘b’ - for 10 MeV, ‘c’ - for 100 MeV.
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Reconstructed image of the source
b c d e f Reconstructed images of a far field point source at initial neutron energies of 1,2,5,10,25,50,100 MeV are shown in figures a-g accordingly. g
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Detection, triggering efficiencies and initial parameters reconstruction
Energy dependencies of detection, triggering efficiencies and initial parameters reconstruction (red, blue and pink curves). Dots correspond to values obtained for monoenergetic beams.
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Average number of hits in different parts of the detector
Energy dependencies of average number of hits per one original particle, in the strip detector and in the calorimeter (red, blue and pink curves).
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Generation pattern of the secondary particles
Secondary particles generation pattern at initial neutron energies of 100 MeV in the volume of the detector and in XY, XZ, YZ planes for protons and alpha particles.
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Generation pattern of the secondary particles
Secondary particles generation pattern at initial neutron energies of 100 MeV in the volume of the detector and in XY, XZ, YZ planes for deuterons and tritons.
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Conclusion 1 setup configuration was studied
The angular resolution is applicable only for photons and neutrons with medium energies Energy resolution is reasonable for photons with energies below 50 MeV Things to do: Improve analysis algorithm Try another geometrical configurations Further study of basic interactions (pairs for photons, elastic scattering for neutrons)
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