Tokamak current driven by poloidally asymmetric fueling

Tokamak current driven by poloidally asymmetric fueling

Tokamak current driven by poloidally asymmetric fueling 150 150 Mathew

Tokamak current driven by poloidally asymmetric fueling

It is shown that poloidally asymmetric particle transport or fueling in a tokamak generally produces an electric current parallel to the magnetic field, in particular if the transport or fueling is up-down asymmetric. For instance, a current arises in the edge region if most particle transport across the last closed flux surface occurs in the midplane while most refueling comes from recycling near the X-point. This current is negative relative to the bulk plasma current and thus stabilizing to peeling modes if the ion drift is toward the X-point, and changes direction if the magnetic field is reversed. However, this current appears to be smaller than the pedestal bootstrap current under typical conditions.

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18/10/2006