Impurity Control Systems for Reactor Experiments

摘要: Poloidal divertors and pumped limiters are the leading candidates for impurity particle control systems reactor tokamak experiments. Such must be able to provide heat removal He pumping while satisfying requirements (1) minimum plasma contamination by impurities, (2) reasonable component lifetime (~ 1 year), (3) size cost maximum simplicity. While limiter simpler cheaper, poloidal offer possibility of low sputtering rates first wall components modest due formation a cool, dense near collector plates. Estimates made as part INTOR study indicate that could unacceptably large. Both types should adequate pumping. Engineering design studies have been carried out both systems. The divertor system indicates such offers solution problem at only increase in total (~10%) complexity compared system.