Observation of alpha-particles in recent D–T experiments on JET

V.G. Kiptily, C.D. Challis, R. Dumont, M. Fitzgerald, J. Garcia, L. Garzotti, Z. Ghani, J. Hobirk, P. Jacquet, A. Kappatou2024年8月Nuclear FusionIF 3 出版社

The fusion reaction between deuterium and tritium, D(T,n)4He is the main source of energy in future thermonuclear reactors. Alpha-particles (4He-ions) born with an average energy of 3.5 MeV transferring energy to the thermal plasma during their slowing down, should provide the self-sustained D–T plasma burn. The adequate confinement of α-particles is essential to provide efficient heating of the bulk plasma and steady burning of a reactor plasma. That is why the fusion-born α-particle studies have been a priority task in the second D–T experiments (DTE2) on the Joint European Torus (JET) to understand the main mechanisms of their slowing down, redistribution and losses and to develop optimal plasma scenarios. JET with Be-wall and W-divertor, enhanced auxiliary heating systems and improved energetic-particle diagnostic capabilities, producing significant population of α-particles, provided the possibility for comprehensive studying of the α-particle behaviour. Selected results of the confined and lost α-particle measurements, evidence of α-particle self-heating and assessments of the fusion performance are presented in this paper giving an opportunity for further modelling and extrapolation to the International Thermonuclear Experimental Reactor and burning plasma reactors.

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ENThis paper is of interest to fusion researchers, particularly those working on plasma physics, energetic particle behavior, and the development of fusion reactors. It provides valuable insights into the understanding of alpha-particle dynamics, which is essential for the optimization of future fusion power plants.#FusionResearch #AlphaParticles #JETExperiments #PlasmaPhysics #FusionReactors

This paper discusses the study of alpha-particles, a key product of fusion reactions, in the recent D-T experiments on the Joint European Torus (JET). The adequate confinement of alpha-particles is crucial for efficient heating of the plasma and sustained fusion reactions in future reactors. The paper presents results on the measurement and behavior of confined and lost alpha-particles, as well as evidence of alpha-particle self-heating and fusion performance assessments.