TFTR impurity control

TFTR is a high-energy-density beam-driven tokamak that will utilize both two-component and thermonuclear DT reactions to achieve 'approximate energy breakeven' in the mid 1980's. High-energy-density plasmas, disruptions and DT operation impose severe design constraints on the TFTR impurity control system. The TFTR energy removal system consists primarily of a large area axisymmetric toroidal limiter covered with TiC coated graphite tiles. Recycling control is accomplished with a regenerable Zr Al getter pump that covers approx. equal to 10% of the torus wall. The performance of TFTR will depend significantly on the success of the TFTR impurity control system. This paper gives a status report on the requirements, design concepts and prototype tests for the moveable limiter, bellows cover plates, bumper limiter, and surface pumping system. (orig./AH)