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In the low aspect ratio torus experiment(LATE)device,plasma current is initiatedand ramped up to 20 kA solely by microwave power at the electron cyclotron(EC)range offrequency with a ramp of the external vertical field B_v for the radial equilibrium of plasma torusat larger currents.Measurements suggest that an energetic electron tail in the energy range ofabout 200 keV carries the current.The line averaged electron density is higher than the plasmacutoff density,suggesting that tail electrons might be driven by electron Bernstein waves modeconvertedfrom the launched electromagnetic waves.
Plasma current is initiated and ramped up to 20 kA solely by microwave power at the electron cyclotron (EC) range offrequency with a ramp of the external vertical field B_v for the radial equilibrium of plasma torusat larger currents. Measures suggest that an energetic electron tail in the energy range ofabout 200 keV carries the current. The line averaged electron density is higher than the plasmacutoff density, suggesting that the tail electrons might be driven by electron Bernstein waves modeconvertedfrom the launched electromagnetic waves.