POWER FLUX AND ELECTRIC-CURRENT FLOW TO THE DIVERTOR TARGET PLATES OF JET

Divertor plate heat loads are recognised as a critical design issue for large power tokamaks. Target heat load data obtained during high-power divertor discharges at JET show a large, narrow peak of power flux near the strike point of the separatrix and in the same region an electric current flowing from the target to the plasma. We present an analytical model which connects both phenomena and gives some insight into the underlying physics.