[en] A one-dimensional model of an aircore transformer is developed through which it is possible to analyze the effect of eddy currents in the primary windings--and of similar currents in the field coils for the toroidal magnetic field--on the time dependence of the current in a Tokamak experiment. The model is applied to the Alcator Tokamak, and its accuracy is tested by comparing analytical results for the harmonic behavior of the transformer, with experimental data. The time dependent behavior of the plasma current--for a constant plasma resistance--shows that eddy currents in the primary windings will lead to a reduction of 8% of the current maximum. The eddy currents in the Bitter coils are found to affect predominantly the initial current rise, they lead to a steepening of the current rise. Finally, the influence of the time dependence of the plasma resistance is investigated

[en] The author discusses results obtained in high energy field Tokamaks at temperatures of 1 KeV. In particular, work carried out at the MIT Alcator Tokamak with cooperation from FOM-Jutphaas has led to the achievement of 2.10¹⁹ sec/m³, only one order of magnitude smaller than the desired ntau product. A plasma of high temperature and density has been realised which exhibits heat transport close to the expected classical value. (D.J.B.)

No abstract available

No abstract available

[en] Linear dispersion phenomena in Vlasov-Poisson plasma's with drift are studied in order to be able to test the relevance of linear theory for plasma turbulence. Especially the effect of the addition of light ions, giving rise to stabilisation, is taken into account. Emphasis is laid on approximate methods that give the possibility to investigate the influence of parameters like ion-mass-ratio, temperature ratio etc. Numerical results are given for a He-A plasma. (Auth.)

No abstract available

[en] The process of plasma deposition and surface modification depends on the nature and intensity of the particle and energy fluxes incident on the substrate. By way of examples of plasma beam deposition possible mechanisms will be shown, which influence the growth of good quality layers with high growth rates. The possible contributions of ion, radical and energy fluxes will be summarised. The possibility of replacing the ion (and radical) fluxes by ion (and radical) beams will be discussed. At hand is a short summary of available ion beams and a discussion of restraints and necessary conditions to the source plasma for ion beam formation. Possibilities to achieve high brightness sources with a large efficiency will be indicated. (orig.)

[en] Short communication

[en] It is proven that neoclassical ion heat conduction is the major energy loss mechanism in the center of an ohmically heated high-density tokamak discharge (n > 3 10²⁰m^-3). This fixes the mutual dependence of plasma quantities on axis and leads to scaling laws for the poloidal beta and energy confinement time given the empirical fact that the pressure profile and the current density profiles are Gaussians. 8 references, 5 figures

[en] In this contribution a number of experimental data concerning a well-defined RF-discharge, similar to those applied in surface processing of semiconductor material, are presented. Experimental values of electron densities, etch rates and ratio of fluorine to argon emission as a function of pressure are presented. (G.Q.)