TORE SUPRA is a large superconducting tokamak designed for sustaining long inductive pulses (t -30 s ) . In particular, all the first wall components have been designed for steady-state heat and particle exhaust , particle injection,and additional heating. In addition to these technological assets, a strict control of the plasma-wall interactions is required. This has been done at low power : experiments with ohmic heating have been mainly devoted to the pump limiter, ergodic divertor and pellet injection experiments. Some specific problems arising in large tokamaks are encountered ; the pump limiter and the ergodic divertor yield the expected effects on the plasma edge. The effects on the bulk are discussed.
A high-frequency hot electron instability is observed in ELMO Bumpy Torus (EBT) plasmas when the hot electron-to-ion density ratio exceeds 0.4. Both the real frequency and the imaginary frequency are larger than the ion cyclotron frequency. The azimuthal mode number (m) is 7, and the instability rotates in the hot electron curvature drift direction. This instability is identified as a curvature-driven mode. When it is strongly excited, the equilibrium of the hot electron annuli and confined plasmas are destroyed (disruption). Ion heating and neutron bursts are associated with this instability.
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