Journal ArticleDOI
Effect of toroidal field ripple on particle and energy transport in a tokamak
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In this article, the diffusion and ion heat transport coefficients associated with ripple-induced drift of particles trapped in the usual banana orbits have been calculated and the results compared with the coefficients for neoclassical banana transport in axisymmetric tokamaks, transport governed by the dissipative trapped-ion instability, and the transport associated with particles trapped between the coil planes by the ripple field itself.Abstract:
The azimuthal asymmetry introduced in tokamaks by the use of a finite number of toroidal field coils can lead to anomalously large particle and energy losses. The diffusion and ion heat transport coefficients associated with the ripple-induced drift of particles trapped in the usual banana orbits have been calculated and the results compared with the coefficients for neoclassical banana transport in axisymmetric tokamaks, transport governed by the dissipative trapped-ion instability, and the transport associated with particles trapped between the coil planes by the ripple field itself. The calculations were performed for an Experimental Power Reactor design and show that the losses due to the ripple-induced banana drifts can be a major limit on fusion reactor magnet design.read more
Citations
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Journal ArticleDOI
Effect of Toroidal Field Ripple on Fast Ion Behavior in a Tokamak
TL;DR: In this article, the authors performed computational studies for fast ion behavior in a Tokamak with toroidal field ripple and classified the fast ion loss associated with ripple into two groups; ripple-trapped loss and banana-drift loss.
Journal ArticleDOI
Neoclassical theory of transport processes in toroidal magnetic confinement systems, with emphasis on non-axisymmetric configurations
TL;DR: A review of the theory of transport processes in the different types of toroidal magnetic configuration now being used to study the possibility of producing a controlled thermonuclear reaction is presented in this paper.
Journal ArticleDOI
Neutral-beam-driven tokamak fusion reactors
TL;DR: In this paper, the physical basis and plasma engineering parameters of beam-driven tokamak reactors are discussed, and the role of the energetic ions in plasma heating, fuelling, and current maintenance, as well as in the direct enhancement of fusion power multiplication and power density is discussed in detail for the three reactor types.
Journal ArticleDOI
Enhanced transport in tokamaks due to toroidal ripple
TL;DR: In this article, a method for evaluating transport in nonsymmetric systems is developed and applied to a previously little studied ripple collisionality regime of tokamaks, the ripple plateau.
Journal ArticleDOI
Effects of toroidal field ripple on suprathermal ions in tokamak plasmas
TL;DR: In this article, the effects of toroidal field ripple on suprathermal ions in tokamak plasmas are analyzed and three important effects of Toroidal Field Ripples are presented.
References
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Journal ArticleDOI
Plasma Transport in Toroidal Confinement Systems
TL;DR: In this article, a variational principle for the rate of irreversible entropy production in axisymmetric toroidal confinement systems was derived by employing the full Fokker-Planck collision operator, including both like and unlike species collisions.
Journal ArticleDOI
Trapped particles in toroidal magnetic systems
B.B. Kadomtsev,O.P. Pogutse +1 more
TL;DR: In this paper, the role of trapped particles for equilibrium, diffusion and stability of plamas in toroidal magnetic devices is discussed and the correspondence between the neoclassical theory of diffusion, the turbulent transport processes due to the instabilities and the existing experimental Tokamak data is discussed.
Journal ArticleDOI
Effect of the magnetic field ripple on diffusion in Tokamaks
TL;DR: In this article, the authors evaluated the magnetic field modulation due to the discrete nature of the field coils in a Tokamak and compared the resulting diffusion with the neoclassical diffusion.
Journal ArticleDOI
Neoclassical diffusion arising from magnetic-field ripples in Tokamaks
J.W. Connor,R.J. Hastie +1 more
TL;DR: A solution of the Fokker-Planck equation for the distribution of trapped particles in the magnetic field ripples of an imperfectly axisymmetric Tokamak is obtained in this article.
Journal ArticleDOI
Collisional Diffusion in Nonaxisymmetric Toroidal Systems
TL;DR: Collisional cross field diffusion in nonaxisymmetric toruses with high shear has been found, but a region of minimum diffusion is shown to exist which might provide an attractive operating regime for future reactor considerations as discussed by the authors.
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Neoclassical diffusion arising from magnetic-field ripples in Tokamaks
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