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Earlier work on TEXTOR has allowed the identification of an operational regime which is accessed with NBI-co and the combinations NBI-co+ICRH and NBI-co+counter. This regime has an energy confinement which is far in excess of the standard L-mode scaling that was, and still is, the rule on TEXTOR before the pure NBI-counter and ICRH operations or their combinations. The improved I-regime has recently been investigated further through parametric studies over a wide range of plasma currents and densities. All results pertain to circular discharges limited by the belt limiter ALT-II with boronised walls. Heating powers up to 2 x 1.8 MW of tangential NBI and up to 3.6 MW of ICRH have been applied. The case of NBI-co+counter shows peaked density profiles reminiscent of those of the supershot regime. The confinement in the L- and I-modes improves with I(p). Transitions from I to L have been observed.

Additional information

Authors: ONGENA J ET AL., Ecole Royale Militaire, Bruxelles (BE);CONRADS H ET AL., Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);HILLIS D L, Oak Ridge National Laboratory, Oak Ridge (US)
Bibliographic Reference: Article: 18th European Conference on Controlled Fusion and Plasma Physics, Vol. I (1991) pp. 409-412
Record Number: 199111388 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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