Latest results from JET

JET tokamak performance has been progressively raised, culminating in operation at the full design level of 5 MA plasma current in a toroidal field at 3.4 T. the plasma current, position, shape and line-average electron density are controlled by feed-back systems. By glow discharge cleaning in H2/methane mixtures, the interior of the vessel has been coated with carbon. This reduces the fraction of power radiated <or=50% at intermediate densities and raises the density limit for disruption by 10%. Operation over a wide range of parameters has given data for more extensive scaling studies. With ohmic heating, the maximum global energy confinement time is 0.8+or-0.1 s and the maximum central ion-temperature approximately 3.0 keV. The highest (n tau E Ti) product is reached with ohmic heating in a deuterium plasma.