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The improved ergodic divertor (ED), with a power handling capability of 9 MW over 30 s, opens the way to steady-state operation. Bootstrap current generation is investigated with fast wave electron heating and beta(p) approximately 0.3 is achieved with P(add) approximately 7.6 MW. Lower hybrid current drive up to 75% of the total current of 1.3 MA has been achieved with P(LH) approximately 4.5 MW. Detachment in this open divertor configuration occurs at 44% of the Greenwald density in ohmic shots. Target-plate plasma temperatures drop below 10 eV at detachment and then reach 8 +/- 1.75 eV. The energy flux to the target plate vanishes in this detached regime. Enhancement of radiation with respect to the JET scaling is achieved for some ED shots. Self-healing of the confinement loss in the boundary layer is numerically investigated. In qualitative agreement with experimental results, an intrinsic transport barrier is found to build up in the vicinity of the separatrix.

Additional information

Authors: GHENDRIH P, CEA, CEN Cadarache, St-Paul-lez-Durance (FR)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 39 (1997) pp. B207-B222
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