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The improved ergodic divertor, 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) ~ 0.3 is achieved with P(add) ~ 7.6 MW. Lower hybrid current drive up to 75% of the total current of 1.3 MA has been achieved with P(LH) ~ 4.5 MW. Detachment in this open divertor configuration occurs at 44% of the Greenwald limit in ohmic shots. Target plat plasma temperatures drop below 10 eV at detachment and then reach 8 eV ± 1.75 eV. The infrared and Langmuir probe measured energy flux to the target plate vanishes in these detached regimes. Enhancement of radiation H(Rad) with respect to the Joint European Torus (JET) scaling is achieved for some ergodic divertor shots, H(Rad) ~ 5. Self healing of the confinement loss in the boundary layer is investigated numerically. 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, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion (1997)
Record Number: 199810155 / Last updated on: 1998-02-12
Original language: en
Available languages: en