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GEANT4 Simulations of a Beam Shaping Assembly Design and Optimization for Thermal/Epithermal Neutrons Vahagn Ivanyan  Yerevan Physics Institute, Armenia.

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Presentation on theme: "GEANT4 Simulations of a Beam Shaping Assembly Design and Optimization for Thermal/Epithermal Neutrons Vahagn Ivanyan  Yerevan Physics Institute, Armenia."— Presentation transcript:

1 GEANT4 Simulations of a Beam Shaping Assembly Design and Optimization for Thermal/Epithermal Neutrons Vahagn Ivanyan  Yerevan Physics Institute, Armenia 9-June-2017 2 nd Jagiellonian Symposium of Fundamental

2 2nd Jagiellonian Symposium
Overview Introduction Cyclotron C18/18 Difference of neutron yield depends on target thickness GEANT4 simulations for creating Beam Shaping Assembly Conclusion 2nd Jagiellonian Symposium 2 nd Jagiellonian Symposium of Fundamental

3 2nd Jagiellonian Symposium
Introduction The possibility of obtaining thermal/epithermal neutron beams using external protons from Cyclotron C18/18 is studied based on GEANT4 simulations. In this model of the GEANT4 simulation included two programs for physics lists. These are the one of the most important parts of the creation the correct model, which will as much as possible closer to the future experiment. The formed beam of thermal/epithermal neutron beams will be used not only in fundamental research, but also for practical purposes, in particular, to explore the possibility of applying it in Boron Neutron Capture Therapy (BNCT). 2nd Jagiellonian Symposium

4 2nd Jagiellonian Symposium
Cyclotron C18/18 18 MeV Proton Beam Energy Up to 100 μA Beam Current 2nd Jagiellonian Symposium

5 Just a small difference of Neutrons 2nd Jagiellonian Symposium
Beryllium Melting Point = 1287 C Lithium Melting Point = C Cooling System Difficult, Expensive, Just a small difference of Neutrons Be 2nd Jagiellonian Symposium

6 2nd Jagiellonian Symposium
All Neutron Emitted Reactions on 9Be Target With Thresholds Less Than 14.8 MeV  Reaction Q – value (MeV) Threshold p+9Be → n+9B 2.0572 p+9Be → γ+n+9B 2.057 p+9Be → p+n+8Be p+9Be → γ+n+p+8Be p+9Be → γ+n+α+5Li 3.9333 p+9Be → p+n+2α 2nd Jagiellonian Symposium

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Neutron Energy Spectra after 3 cm Air and Beryllium Targets Count [au] 1. 3cm Air and 0.5 mm Be 2. 3cm Air and 1 mm Be 3. 3cm Air and 2.5 mm Be 2nd Jagiellonian Symposium Energy [MeV]

8 2nd Jagiellonian Symposium
1. Neutron Energy Spectrum after 2.5 mm Be and 5cm Bismuth 2. Neutron Energy Spectrum after 2.5 mm Be Count [au] Energy [MeV] 2nd Jagiellonian Symposium

9 2nd Jagiellonian Symposium
209Bi(n,xn) Reactions n + 209Bi → 208Bi + 2 n n + 209Bi → 208Bi + 2 n + N γ n + 209Bi → 209Bi + n + N γ n + 209Bi → 209Bi + n 2nd Jagiellonian Symposium

10 Neutron Energy Spectrum after 2.5 mm Be, 5 cm Bismuth and 50 cm Iron
Count [au] Energy [MeV] 2nd Jagiellonian Symposium

11 2nd Jagiellonian Symposium
Neutron Energy Spectrum after 5 cm Bismuth, 50 cm Iron, 10 cm Aluminum and 5 cm Graphite Count [au] Neutrons Up to 200 keV 6.25% 2nd Jagiellonian Symposium

12 2nd Jagiellonian Symposium
Neutron Energy Spectrum after 5 cm Bismuth, 50 cm Iron, 15 cm Aluminum, 5 cm Graphite and 4cm Lead Count [au] Err=17.7% Neutrons Up to 200 keV 18.2% Err=44.7% Energy [MeV] 2nd Jagiellonian Symposium

13 2nd Jagiellonian Symposium
Neutron Energy Spectrum after 5 cm Bismuth, 50 cm Iron, 15 cm Aluminum, 5 cm Graphite and 4cm Aluminum Count [au] Neutrons Up to 200 keV 20.1% Energy [MeV] 2nd Jagiellonian Symposium

14 2nd Jagiellonian Symposium
GEANT4 Simulation 2nd Jagiellonian Symposium 14

15 GEANT4 Simulation 15 2nd Jagiellonian Symposium

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Neutron Energy Spectrum after 5 cm Bismuth, 55 cm Iron, 15 cm Aluminum, 5 cm Graphite, 85 cm Water Count [au] Neutrons Up to 200 keV 20.7% 2nd Jagiellonian Symposium Energy [MeV]

17 2nd Jagiellonian Symposium
Neutron Energy Spectrum after 5 cm Bismuth, 55 cm Iron, 15 cm Aluminum, 5 cm Graphite, 85 cm Heavy Water Count [au] Neutrons Up to 200 keV 20.7% Energy [MeV] 2nd Jagiellonian Symposium

18 2nd Jagiellonian Symposium
Neutron Energy Spectrum after 5 cm Bismuth, 55 cm Iron, 15 cm Aluminum, 90 cm Graphite Count [au] Neutrons Up to 200 keV 22% Energy [MeV] 2nd Jagiellonian Symposium

19 Neutron Energy Spectrum after 5 cm Bismuth, 55 cm Iron,
15 cm Aluminum, 150 cm Graphite Count [au] Neutron Beam: 1.27*107 n/s*cm2 For 100 μA Proton Current Neutrons from Up to 200 keV 27.5% 2nd Jagiellonian Symposium Energy [MeV]

20 2nd Jagiellonian Symposium
Neutron Energy Spectrum after 5 cm Bismuth, 55 cm Iron, 20 cm Aluminum, 165cm Graphite Count [au] Neutrons Up to 200 keV 26.7% Energy [MeV] 2nd Jagiellonian Symposium

21 2nd Jagiellonian Symposium
Neutron Energy Spectrum after 5 cm Bismuth, 55 cm Iron, 10 cm Aluminum, 5cm Graphite and 10 cm 7LiF Count [au] Neutrons Up to 200 keV 61.1% Energy [MeV] 2nd Jagiellonian Symposium

22 2nd Jagiellonian Symposium
Conclusion BSA: 2.5 mm 9Be target, 5 cm Bismuth (1), 55 cm Iron (2), 10 cm Aluminum (3), 5cm Graphite (4), 10 cm 7LiF(5), Lead Reflector (6) Neutron Beam: 0.96 *10 6 n/s*cm2 For 100 μA Proton Current 2nd Jagiellonian Symposium

23 Conclusion BSA: 2.5 mm 9Be target, 5 cm Bismuth (red), 55 cm Iron (blue), 10 cm Aluminum (yellow), 5cm Graphite (white), 10 cm 7LiF (green), Lead Reflector (purple) Neutron Beam: 0.96 *10 6 n/s*cm2 For 100 μA proton current 2nd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics 23

24 Publications R. Avagyan, R. Avetisyan, V. Ivanyan , I. Kerobyan
Calculations of neutron yield and gamma rays intensity by Geant4 Armenian Journal of Physics 9(4) 2016, pp Study of Low Energy neutron beam formation based on GEANT4 simulations Nuclear Instruments and Methods in Physics Research Section B, Beam Interactions with Materials and Atoms (Available online, In Press) 2nd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics

25 Thank You

26 IAEA Recommendations of Neutron Current
Φ th, Φ epi, Φ fast : Thermal, Epithermal, and fast Neutrons Φ th [%] 3.5 Φ epi 87.4 Φ fast 9.1 2nd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics

27 Publications R. Avagyan, R. Avetisyan, V. Ivanyan , I. Kerobyan
Calculations of neutron yield and gamma rays intensity by Geant4 Armenian Journal of Physics 9(4) 2016, pp Study of Low Energy neutron beam formation based on GEANT4 simulations Nuclear Instruments and Methods in Physics Research Section B, Beam Interactions with Materials and Atoms (Available online, In Press) 2nd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics

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