Fast Ion Speed Diffusion Effect on Distributions of Fusion Neutrons
Source abstract
Abstract
Velocity distributions of fuel nuclei enter the formulae for distributions of products of fusion reactions in plasma. The formulae contain multiple integration, which is a computationally heavy task. Therefore, simplifications of the integrand are advantageous. One of possible simplifications is the use of closed-form analytical distributions of fast deuterons and tritons, accounting for slowing down and pitch-angle scattering and neglecting the speed diffusion. The plausibility of such a model has been studied from the viewpoint of its influence on the calculated spectra of fusion neutrons. Calculations have shown that the speed diffusion effect on suprathermal ion distribution tails does not significantly alter the qualitative behaviour of energy and angle distributions of fusion products in a beam-heated plasma.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Magnetic confinement fusion research · Nuclear Physics and Applications · Cold Fusion and Nuclear Reactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Advanced Plasma Research Laboratory, Peter the Great St. Petersburg Polytechnic University, 195251 Saint Petersburg, Russia
Funding
Ministry of Science and Higher Education of the Russian Federation · IAEA Coordinated Research Project
References (50)
Show source-provided references
1. Feasibility study of tokamak, helical and laser reactors as affordable fusion volumetric neutron sources10.1088/1741-4326/ac3367 ↗
2. Research on fusion neutron sources10.1063/1.4729452 ↗
3. Fusion for Neutrons: A Realizable Fusion Neutron Source10.1109/TPS.2011.2181959 ↗
4. Steady-state operation in compact tokamaks with copper coils10.1088/0029-5515/51/7/073013 ↗
5. Progress in the design of the DEMO-FNS hybrid facility10.1088/1741-4326/ab14a8 ↗
6. Economy of Tokamak Neutron Source for Transmutation of Transuranics10.1585/pfr.14.1405040 ↗
7. On the feasibility of fusion–fission hybrid based on deuterium fuelled tokamak10.1016/j.fusengdes.2019.111302 ↗
8. Tokamak D–T fusion neutron source requirements for closing the nuclear fuel cycle10.1088/0029-5515/47/3/008 ↗
9. Multiphysics approach to plasma neutron source modelling at the JET tokamak10.1088/1741-4326/ab2c8b ↗
10. Modeling of a Spherical Tokamak as an Extended Neutron Source Using ASTRA and MCNP10.1109/TPS.2020.2990559 ↗
11. Three-dimensional model of DEMO-FNS facility considering neutronics and radiation shield problems10.1016/j.heliyon.2019.e01630 ↗
12. Advanced Neutron Spectroscopy in Fusion Research10.1007/s10894-019-00213-9 ↗
13. Incident neutron spectra on the first wall and their application to energetic ion diagnostics in beam-injected deuterium–tritium tokamak plasmas10.1063/1.4986859 ↗
14. Modification of neutron emission spectrum by Alfvén eigenmodes in a deuterium–tritium plasma10.1016/j.fusengdes.2018.12.055 ↗
15. Blanket/first wall challenges and required R&D on the pathway to DEMO10.1016/j.fusengdes.2015.07.021 ↗
16. Benchmark Experiments for Verifying the Working Parameters of the Blankets of a Thermonuclear Neutron Source10.1007/s10512-016-0095-x ↗
17. Study on fission blanket fuel cycling of a fusion–fission hybrid energy generation system10.1088/0029-5515/51/10/103011 ↗
18. Neutronics analysis of blankets for a hybrid fusion neutron source10.1088/0029-5515/55/11/113007 ↗
19. Fusion–Fission Hybrid Systems: Yesterday, Today, and Tomorrow10.1080/15361055.2020.1817701 ↗
20. Fusion-fission hybrid system development and integration into Russia’s nuclear power engineering
21. Power and Sizes of Tokamak Fusion Neutron Sources with NBI-Enhanced Reaction Rate10.1007/s10894-016-0111-0 ↗
22. Dlougach, E., Shlenskii, M., and Kuteev, B. (2022). Neutral Beams for Neutron Generation in Fusion Neutron Sources. Atoms, 10.10.3390/atoms10040143 ↗
23. Generation of a plasma neutron source for Monte Carlo neutron transport calculations in the tokamak JET10.1016/j.fusengdes.2018.04.065 ↗
24. Versatile fusion source integrator AFSI for fast ion and neutron studies in fusion devices10.1088/1741-4326/aa92e9 ↗
25. Spectra of neutrons from a beam-driven fusion source10.1088/0029-5515/55/6/063012 ↗
26. Reduction of the isotropic S-formula for the energy spectrum of nuclear fusion products to a triple integral10.1088/1361-6587/ab8ca1 ↗
27. Anisotropic distributions of deuterium–deuterium nuclear fusion products in a compact tokamak10.1088/1361-6587/abc08d ↗
28. Reaktionsneutronen als Hilfsmittel der Plasmadiagnostik10.1007/BF01326097 ↗
29. Lessor, D.L. (1975). Neutron and Alpha Particle Energy Spectrum and Angular Distribution Effects from Beam-Plasma D-T Fusion, Battelle Pacific Northwest Labs.. Rept. BNWL-B-409.10.2172/4210807 ↗
30. Towner, H.H., and Jassby, D.L. (1975, January 16). Energy Spectra of Fusion Neutrons from Plasmas Driven by Reacting Ion Beams. Proceedings of the Winter Meeting of the American Nuclear Society, San Francisco, CA, USA.
31. Observation of the Alpha Particle “Knock-On” Neutron Emission from Magnetically Confined DT Fusion Plasmas10.1103/PhysRevLett.85.1246 ↗
32. Modification of alpha-particle emission spectrum in beam-injected deuterium-tritium plasmas10.1063/1.3106683 ↗
33. Neutron spectra from beam-heated fusion plasmas10.1016/0167-5087(84)90043-7 ↗
34. Calculating fusion neutron energy spectra from arbitrary reactant distributions10.1016/j.cpc.2015.10.010 ↗
35. Monte Carlo particle collision model for qualitative analysis of neutron energy spectra from anisotropic inertial confinement fusion10.1016/j.hedp.2020.100803 ↗
36. Analytical expressions for fusion spectra produced in ‘‘beam-target’’ fusion reactions10.1063/1.1138235 ↗
37. The production spectrum in fusion plasmas10.1088/0741-3335/53/4/045002 ↗
38. CODATA recommended values of the fundamental physical constants: 201810.1103/RevModPhys.93.025010 ↗
39. Analytical and semianalytical solutions to the kinetic equation with Coulomb collision term and a monoenergetic source function10.1063/1.3505482 ↗
40. Drosg, M., and Otuka, N. (2023, January 05). International Nuclear Data Committee Report INDC(AUS)-0019, 2019, IAEA Nuclear Data Section. Available online: https://www-nds.iaea.org/publications/indc/indc-aus-0019.pdf.
41. Differential and total cross sections and astrophysical S-factors for 2H(d,n)3He and 2H(d,p)3H reactions in a wide energy range10.1016/j.adt.2017.05.006 ↗
42. Numerical and semi-analytical treatments of neutral beam current drive in DEMO-FNS10.1016/j.fusengdes.2017.03.023 ↗
43. Goncharov, P.R. (Atoms, 2023). Analytical and statistical modelling of the fast ion source due to neutral beam injection in magnetically confined plasma, Atoms, submitted.10.3390/atoms11020024 ↗
44. Overview of GLOBUS-M2 spherical tokamak results at the enhanced values of magnetic field and plasma current
45. Measurement of the fast ion distribution using active NPA diagnostics at the Globus-M2 spherical tokamak10.1088/1361-6587/ac3497 ↗
46. Neutron diagnostic system at the Globus-M2 tokamak10.1016/j.nima.2022.166425 ↗
47. Recent development of neutron and energetic-particle diagnostics for LHD deuterium discharges10.1088/1748-0221/17/03/C03036 ↗
48. Observation of neutron emission anisotropy by neutron activation measurement in beam-injected LHD deuterium plasmas10.1088/1741-4326/ab90c9 ↗
49. Advanced neutron diagnostics for JET and ITER fusion experiments10.1088/0029-5515/45/9/019 ↗
50. Present Status of ITER Neutron Diagnostics Development10.1007/s10894-019-00220-w ↗