Plasma and Fusion Research

Volume 11, 1403105 (2016)

Regular Articles

Knock-on Tail Formation Due to Nuclear Elastic Scattering and Its Observation Method Using γ-Ray-Generating 6Li+d Reaction in Tokamak Deuterium Plasmas
Hideaki MATSUURA, Shota SUGIYAMA, Shogo KAJIMOTO, Daisuke SAWADA, Yosuke NISHIMURA and Yasuko KAWAMOTO
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Motooka, Fukuoka 819-0395, Japan
(Received 8 January 2016 / Accepted 1 June 2016 / Published 16 September 2016)

Abstract

A knock-on tail formation in deuteron velocity distribution function due to nuclear elastic scattering (NES) by energetic protons and its observation method using γ-ray-generating 6Li(d,pγ)7Li reaction are examined for proton-beam-injected deuterium plasmas. The proton velocity distribution function is obtained by means of the ion trajectory analysis in a Tokamak magnetic configuration. The knock-on tail in two-dimensional (2D) deuteron velocity distribution function due to NES by energetic protons is evaluated via Boltzmann collision integral and 2D Fokker-Planck simulation. From the 2D deuteron velocity distribution function obtained, enhancement of the emission rate of 0.48-MeV γ-rays by 6Li(d,p)7Li∗, 7Li∗→7Li+γ reaction due to NES is evaluated. It is shown that the γ-ray emission rate is significantly influenced by the magnitude of the knock-on tail, and the γ-ray-generating reaction can be a useful tool for the knock-on tail observation.

Keywords

nuclear elastic scattering, knock-on tail, γ-ray-generating 6Li(d,pγ)7Li reaction, Boltzmann collision integral, Fokker-Planck equation

DOI: 10.1585/pfr.11.1403105

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