Recent JET results and future prospects

The latest results of JET plasmas in transient and steady states are presented. Substantial improvements in plasma purity and corresponding reductions in plasma dilution have resulted from the use of beryllium as the first wall material facing the hot plasma. As a consequence, plasmas with a fusion triple product (n{sub D}(0){tau}{sub E}T{sub i}(0)) in the range 8--9 {times} 10{sup 20} m{sup {minus}3} skeV have been achieved (within a factor of 8 that required in a fusion reactor), albeit under transient conditions. The general JET performance has also improved, allowing the parameters of a reactor plasma to be individually achieved in JET. In view of their importance for reactors, the JET results are presented with particular emphasis on their significance for the formulation of a plasma model for the Next Step. However, impurity influxes limit the attainment of better parameters and prevent the realization of steady state conditions at high heating powers. To address these problems of impurity control, plasma fueling and helium ash exhaust, a New Phase is planned for JET. An axisymmetric pumped divertor configuration will allow operating conditions close to those of a reactor. The divertor configuration should demonstrate a concept of impurity control and determine the size and geometry needed to fulfill this concept in a reactor. It should identify appropriate materials for plasma facing components and define the operational domain for the Next Step

Future plans for JET and ideas for a post-JET machine

SIGLEAvailable from British Library Document Supply Centre- DSC:4672.262(JET-P--89-60) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

JET Evolution, status and prospects

Preprint of talk at Royal Soc. Discussion Meeting on JET Project, London (GB), 12-13 Mar 1986SIGLEAvailable from British Library Document Supply Centre- DSC:4672.262(JET-P--86/17) / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Comparison between beryllium and graphite as materials for JET limiters and wall surfaces

SIGLEAvailable from British Library Document Supply Centre- DSC:4672.2625(JET-R--89/14) / BLDSC - British Library Document Supply CentreGBUnited Kingdo