Steady Current Generation by RF Travelling Field in a Magnetized Toroidal Plasma

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Abstract
There are two factors to control the currents driven by RF fields travelling along a toroidal plasma; one is the penetration depth of the RF magnetic field into the plasma, and the other is the ratio of the RF magnetic field to the static toroidal magnetic field B t . The currents are observed to increase with B t , since the skin depth for the RF fields increases. There is optimum toroidal magnetic field to hold a maximum toroidal current, and at higher B t , the toroidal currents decrease as more strongly than B t -1 . The toroidal current can also be excited by a local assembly of RF coils.