Heavy impurity transport in tokamaks with plasma flows and saturated 3D perturbations

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Magnetohydrodynamic (MHD) instabilities can limit the performance and degrade the confinement of tokamak plasmas. The Tokamak à Configuration Variable (TCV), unique for its capability to produce a variety of poloidal plasma shapes, has been used to analyse various instabilities and compare their behaviour with theoretical predictions. These instabilities are perturbations of the magnetic field which usually extend to the plasma edge where they can be detected with magnetic pick-up coils as magnetic fluctuat

The Joint European Torus (JET) has recently operated with deuterium-tritium (DT) mixtures, carried out an International Thermonuclear Experimental Reactor (ITER) physics campaign in hydrogen, deuterium, DT and tritium, installed the Mark IIGB 'Gas Box' divertor fully by remote handling and started physics experiments with this more closed divertor. The DT experiments set records for fusion power (16.1 MW), ratio of fusion power to plasma input power (0.62, and 0.95 +/- 0.17 if a similar plasma could be obta

The effects of plasma shape on confinement and sawtooth stability are studied for positive and negative discharge triangularity and for different elongations with 1.5 MW centrally deposited ECH power

A particular configuration of the LHD stellarator with an unusually flat pressure profile has been chosen to be a test case for comparison of the MHD stability property predictions of different three-dimensional and averaged codes for the purpose of code comparison and validation. In particular, two relatively localized instabilities, the fastest growing modes with toroidal mode numbers n = 2 and n = 3, were studied using several different codes, with the good agreement that has been found providing justifi

An analysis of the effect on the wall stabilization of external kink modes due to toroidally continuous gaps in the resistive wall is performed. The effects both with and without toroidal rotation are studied. For a high-beta equilibrium, the mode structure is localized on the outboard side. Therefore, outboard gaps greatly increase the growth rate when there is no rotation. For resistive wall stabilization by toroidal rotation, the presence of gaps has the same effect as moving the wall farther away, i.e.,

A modified CPG in the high density regime of 20-70mT of He was investigated. The injection of the plasmatorus into a driftspace was studied by diamagnetical diagnostics both with and without helical bias, where the inner electrode was continued into the driftspace by a central conductor. Quasi-tokamak geometry is obtained (q almost-equal-to 3; l(j) almost-equal-to 1.2; beta(p) almost-equal-to .7). Mean speed of torus in driftspace: 2.2cm/musec; which is in very good agreement with the MHD model derived. Dis

A numerical study of the free-boundary axisymmetric (n = 0) ideal magnetohydrodynamical (MHD) motions of the EXTRAP device is presented. The dependence of stability on current profiles in the plasma and currents in the external conductors is investigated. Results are shown for linear growth-rates and nonlinear saturation amplitudes and their dependence on plasma radius as well as on the conducting shell radius. The interior region of the plasma is simulated by means of a Lagrangian Finite Element Method (FE

In magnetic resonance studies of cross relaxation or Overhauser effects by steady-state continuous irradn., it is shown that the Solomon equations do not allow one to obtain a consistent picture of the expectation values of various magnetization components. The contradictions can be resolved if, in addn. to the Zeeman polarizations, one takes into account a transverse magnetization component that is assocd. with the spin which is being irradiated. [on SciFinder (R)]

Heavy impurity transport in tokamaks with plasma flows and saturated 3D perturbations

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MHD stability limits in the TCV tokamak

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Comparison of the calculations of the stability properties of a specific stellarator equilibrium with different MHD stability codes

The effect of partial poloidal wall sections on the wall stabilization of external kink modes

Coaxial Plasma Gun in the High-Density Regime and Injection into a Helical Field

Numerical Study of the Axisymmetrical Ideal Mhd Stability of Extrap

Cross relaxation in magnetic resonance: an extension of the Solomon equations for a consistent description of saturation