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Effects of toroidal field ripple on suprathermal ions in tokamak plasmas

Published online by Cambridge University Press:  13 March 2009

R. J. Goldston  and
H. H. Towner
R. J. Goldston
Affiliation:
Plasma Physios Laboratory, Princeton University, Princeton, NJ 08544, USA
H. H. Towner
Affiliation:
Plasma Physios Laboratory, Princeton University, Princeton, NJ 08544, USA
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Abstract

Analytic calculations of three important effects of toroidal field ripple on suprathermal ions in tokamak plasmas are presented. In the first process, collisional ripple-trapping, ions become trapped in local magnetic wells near their banana tips owing to pitch-angle scattering as they traverse the ripple on barely unripple-trapped orbits. In the second process, collisionless ripple-trapping, ions are captured (again near a banana tip) owing to their finite orbits, which carry them out into regions of higher ripple. In the third process, banana-drift diffusion, fast-ion banana orbits fail to close precisely, due to a ripple-induced ‘variable lingering period’ near the banana tips. These three mechanisms lead to substantial radial transport of banana-trapped, neutral-beam-injected ions when the quantity α*≡ε|τ|/Nqδ is of order unity or smaller.

Type
Research Article
Information
Journal of Plasma Physics , Volume 26 , Issue 2 , October 1981 , pp. 283 - 307
Copyright
Copyright © Cambridge University Press 1981

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