Mechanisms of Stochastic Diffusion of Energetic Ions in Spherical Tori | Zendy

Ya.I. Kolesnichenko | Zendy; R. B. White | Zendy; Yu. V. Yakovenko | Zendy

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Mechanisms of Stochastic Diffusion of Energetic Ions in Spherical Tori

Author(s) -

Ya.I. Kolesnichenko,

R. B. White,

Yu. V. Yakovenko

Publication year - 2001

Language(s) - English

Resource type - Reports

DOI - 10.2172/793022

Subject(s) - torus , diffusion , physics , ion , ripple , moment (physics) , magnetic field , field (mathematics) , particle (ecology) , atomic physics , tokamak , classical mechanics , computational physics , plasma , mathematics , quantum mechanics , geometry , oceanography , voltage , pure mathematics , geology

Stochastic diffusion of the energetic ions in spherical tori is considered. The following issues are addressed: (I) Goldston-White-Boozer diffusion in a rippled field; (ii) cyclotron-resonance-induced diffusion caused by the ripple; (iii) effects of non-conservation of the magnetic moment in an axisymmetric field. It is found that the stochastic diffusion in spherical tori with a weak magnetic field has a number of peculiarities in comparison with conventional tokamaks; in particular, it is characterized by an increased role of mechanisms associated with non-conservation of the particle magnetic moment. It is concluded that in current experiments on National Spherical Torus eXperiment (NSTX) the stochastic diffusion does not have a considerable influence on the confinement of energetic ions

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