Effect of thermal 3He minorities on knock-on tail formation and the resulting neutron emission spectrum modification in deuterium-tritium plasmas

H. Matsuura, M. Nakamura, O. Mitarai, Y. Nakao

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

The knock-on tail formations in fuel-ion velocity distribution functions by energetic alpha particles (by the T(d,n)4He reaction) and protons (by the D(d,p)T and 3He(d,p)4He reactions) are investigated by simultaneously solving the Boltzmann-Fokker-Planck (BFP) equations for deuteron, triton, 3He, alpha particle and proton in an ITER-like (DT) plasma admixed with a small amount of 3He. As a result of the 3He inclusion, a fraction of the transferred energy from energetic ions to thermal deuterons and tritons via nuclear plus interference (NI) scattering is reduced. Owing to the NI scattering of the energetic protons by fuel ions, the latter are knocked up to higher energies. The knocking-up effect of fuel ions is enhanced with increasing 3He concentration. It is shown that if 3He with relative concentration of 4.2%, i.e.,n3He/ne, is included in Te = 20 keV, ne = 9.5 × 1019 m-3 plasma, the magnitude of the knock-on tail in deuteron distribution function in 300 keV-3 MeV energy range is reduced by about 15% from the value when 3He is not externally supplied. Such knock-on tail reduction also results in alternation of the non-Gaussian neutron emission spectrum with energies less than ∼13 MeV and above ∼15 MeV.

本文言語英語
論文番号035023
ジャーナルPlasma Physics and Controlled Fusion
53
3
DOI
出版ステータス出版済み - 3 2011

All Science Journal Classification (ASJC) codes

  • 原子力エネルギーおよび原子力工学
  • 凝縮系物理学

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