Measurement of pressure-gradient-driven currents in tokamak edge plasmas |
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Authors: | Thomas D M Leonard A W Lao L L Osborne T H Mueller H W Finkenthal D F |
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Institution: | General Atomics, PO Box 85608, San Diego, California 92186-5608, USA. |
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Abstract: | Localized currents driven by pressure gradients play a pivotal role in the magnetohydrodynamic stability of toroidal plasma confinement devices. We have measured the currents generated in the edge of L- (low) and H- (high confinement) mode discharges on the DIII-D tokamak, utilizing the Zeeman effect in an injected lithium beam to obtain high resolution profiles of the poloidal magnetic field. We find current densities in excess of 1 MA/m2 in a 1 to 2 cm region near the peak of the edge pressure gradient. These values are sufficient to challenge edge stability theories based on specific current formation models. |
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