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<p>The enhancement of the D(d, n)<sup>3</sup>He fusion reaction rate, due to the production of energetic deuterons (referred to as the knock-on tail) via nuclear elastic scattering of energetic beam protons, was observed on the large helical device (LHD). The enhanced reaction rate was measured as an increase in the neutron generation rate by more than one order of magnitude. This observed phenomenon was explained through both the Boltzmann–Fokker–Planck analysis and particle simulations that consider three-dimensional particle motion in beam-heated deuterium plasma. The simulations demonstrated a good agreement with the observed phenomenon, leading to the conclusions that the knock-on tail is formed in the deuteron velocity distribution function.</p>

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Effect of Nuclear Elastic Scattering on the Fusion Reaction Rate in the LHD Plasmas

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月29日

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  • Hideaki Matsuura,
  • Shinji Wakisaka,
  • Takahito Fukuda,
  • Kunihiro Ogawa,
  • Mitsutaka Isobe,
  • Yasuko Kawamoto

摘要

The enhancement of the D(d, n)3He fusion reaction rate, due to the production of energetic deuterons (referred to as the knock-on tail) via nuclear elastic scattering of energetic beam protons, was observed on the large helical device (LHD). The enhanced reaction rate was measured as an increase in the neutron generation rate by more than one order of magnitude. This observed phenomenon was explained through both the Boltzmann–Fokker–Planck analysis and particle simulations that consider three-dimensional particle motion in beam-heated deuterium plasma. The simulations demonstrated a good agreement with the observed phenomenon, leading to the conclusions that the knock-on tail is formed in the deuteron velocity distribution function.