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Abstract. The flexibility of the design of JET has made it well suited to exploring the effects of different plasma shapes and elongations on ELMy H-mode plasmas. Over the past few years, a number of experiments [G. Sabeine; Nuclear Fusion 39 (1999) 1133] have measured such effects and attempted to explain the underlying physics. Two of the principal results have been the strong dependence of confinement on elongation and the improvement of confinement, for densities close to the Greenwald density, at higher triangularities. This led to experiments in Autumn 1999, at the request of the ITER project, to measure, independently, the effects of elongation and shaping at constant q and current. Here we draw together these experiments to produce the best measure yet of the elongation and triangularity scaling on JET. By including data from other machines, from the international confinement database [O. Kardaun; Plasma Phys. Control. Fusion 41 (1999) 429], we show this scaling's impact on possible next step machines, especially by means of two term scaling laws.
IAEA 2001
