Finite Larmor radius effects on ripple diffusion in tokamaks

H. Mimata, K. Tani, K. Tobita, H. Tsutsui, S. Tsuji-Iio, R. Shimada

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The confinement of alpha particle is important in tokamaks. The trajectory or confinement of alpha particles is often calculated with guiding center approximation. The features of spherical tokamak can break the approximation. We investigate finite Larmor radius effect. The orbit calculated by equation of motion is different, especially in toroidal direction, from that by guiding center equations. This difference causes difference of ripple resonance energy and the difference of the peaks of the diffusion coefficients. Furthermore, because of the additional free parameter, Larmor phase, the peaks of diffusion coefficient calculated by equation of motion are broader than those by guiding center equations.

Original languageEnglish
Pages (from-to)638-642
Number of pages5
JournalProgress in Nuclear Energy
Issue number2-6
Publication statusPublished - 2008 Mar


  • Diffusion
  • Ripple
  • ST
  • Tokamak
  • α-Particle


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