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Distortion of Fast α-Particle Two-Dimensional Velocity Distribution Function due to the Transition of Particle Orbit by Nuclear Elastic Scattering in Magnetic Field Confinement

Daisuke SAWADA, Hideaki MATSUURA and Shota SUGIYAMA

Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan

(Received 1 July 2015 / Accepted 9 March 2016 / Published 10 June 2016)

Abstract

The effect of nuclear elastic scattering (NES) on energetic alpha-particles two-dimensional (2D) velocity distribution function in a magnetic fusion device is examined by particle orbit simulation. Energetic alpha-particles exhibit an anisotropic 2D velocity distribution function, because the alpha particle loss reduces the amount of particles moving in a particular direction, and an alpha particle orbit depends on the initial direction of particle. When NES changes the direction of fast alpha particle motion, its orbit can be changed. It is shown that NES causes particle orbit transitions and changes the energetic alpha particles 2D velocity distribution function. We discuss the manner in which the distribution function is changed and how it affects the confinement of fast alpha particles.

Copyright (c) 2016 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

nuclear elastic scattering, particle orbit, alpha particle, 2D velocity distribution function, ITER

DOI: 10.1585/pfr.11.1403067

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