Electrically insulated divertor plates are used on TdeV (Tokamak de Varennes) lsqb;18thEPSConferenceonControlledFusionandPlasmaPhysicsBerlin (European Physical Society, Petithyphen;Lancy, 1991), Vol. 15C, Part I, pp. 1ndash;141rsqb; to produce various biasing configurations, which can be decomposed into two basic modes. Plasma biasing, with a radial electric fieldErin the scrapehyphen;off layer (SOL), is most promising for divertor applications. TheErfield is produced with a particular divertor plate geometry, causing a nonambipolar radial current and a particle flow in theErtimes;BTdirection, toward one of the divertors (the active divertor). The pressure and impurity retention in the active divertor are shown, in the Ohmic regime, to be strongly increased by biasing. He exhaust through this divertor is increased by a factor of almost 3 with modest biasing voltages and currents scalable to larger devices. Biasing also modifies the power repartition between the divertors, with the active divertor also receiving a larger fraction of the power.
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