Confinement of Alpha Particles in a Low-Aspect-Ratio Tokamak Reactor

Keiji Tani, Kenji Tobita, Satoshi Nishio, Shunji Tsuji-Iio, Hiroaki Tsutsui, Takayuki Aoki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Studies on the loss of fusion produced alpha particles enhanced by toroidal field (TF) ripple in a low-aspect-ratio tokamak reactor (VECTOR) have been made by using an orbit-following Monte-Carlo code. The ripple loss is strongly reduced as the aspect ratio becomes low. Consequently, alpha particles are well confined in VECTOR. In a low-aspect-ratio system, the dependence of the ripple loss on the number of TF coils is very weak, if the edge field ripple is kept constant. Thanks to the good confinement of alphas in a low-aspect-ratio system, the number of TF coils can be reduced to about 6, one half of the original VECTOR by installing cooling systems near the outer edge of plasma and making allowances for about 30% increase in the bore diameter of TF coils.

Original languageEnglish
Pages (from-to)938-942
Number of pages5
JournalIEEJ Transactions on Fundamentals and Materials
Issue number11
Publication statusPublished - 2005
Externally publishedYes


  • alpha particle
  • fusion reactor
  • low aspect ratio
  • ripple loss
  • tokamak
  • toroidal field coil

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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