Dual equilibrium in a finite aspect ratio tokamak

Tokamak Reactor Designs as a Function of Aspect Ratio

Error-field induced electromagnetic torques in a large aspect-ratio, low- , weakly shaped tokamak plasma

The toroidal electromagnetic braking torques exerted at the various internal rational surfaces of a large aspect-ratio, low, weakly shaped, tokamak plasma by a nonaxisymmetric error field are investigated using a semianalytic approach. It is found that there is an optimal error-field spectrum for exerting a torque at a given rational surface. This spectrum is dominated by the resonant harmonic,...

Stability of highly shifted equilibria in a large-aspect-ratio tokamak.

High beta poloidal tokamaks can confine plasma pressures an order of magnitude higher than their low beta poloidal counterparts. The theoretical stability of these high beta poloidal magnetohydrodynamics equilibria was left unresolved for many years. Using modern computational tools, such configurations are now found stable to Mercier, resistive and high-n (ideal and resistive) ballooning crite...

Global finite amplitude perturbations in medium aspect ratio pipe flow

Results of a numerical study on the finite amplitude global perturbations inducing transition to turbulence in pipe flow are reported. The aim of this analysis is to characterise the basin of attraction of the basic Hagen-Poiseuille flow (which is believed to be lineary stable for all Reynolds numbers Re) by means of the minimal amplitude of an initial global perturbation triggering transition....

Real-time Equilibrium Reconstruction in a Tokamak

Abstract. This paper deals with the numerical reconstruction of the plasma current density in a Tokamak and of its equilibrium. The problem consists in the identification of a non-linear source in the 2D Grad-Shafranov equation, which governs the axisymmetric equilibrium of a plasma in a Tokamak. The experimental measurements that enable this identification are the magnetics on the vacuum vesse...