Effect of drift modes on currentfree plasma transport processes in a stellarator

Physics

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Charged Particles, Energy Dissipation, Plasma Control, Stellarators, Toroidal Plasmas, Transport Properties, Drift Rate, Electron Scattering, Graphs (Charts), Plasma Diffusion, Thermal Conductivity, Thermal Energy, Thermal Insulation

Scientific paper

Work carried out in the l = 3 Saturn stellarator is discussed along with an experimental investigation of the effect of drift modes on energy and particle losses in a current-free microwave discharge plasma in the Saturn stellarator. The plasma production method, the diagnostics applied, and the plasma parameters are described, and data are reported on the measurement of heat losses via the plasma electrons. Analysis of the relations obtained suggests that the pseudoclassical nature of the energy losses observed across the magnetic field is due to the presence of drift modes in the plasma. Confinement of the charged plasma particles is then studied as a function of the plasma and magnetic-configuration parameters. The results show that at high shear values (theta greater than 0.05) the particle losses correspond to the neoclassical theory in both magnitude and functional dependence.

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