HEATING AND CONFINEMENT IN THE ION CYCLOTRON RANGE OF FREQUENCIES ON THE DIVERTOR TOKAMAK ASDEX
Experiments performed from November 1984 to March 1986 on ASDEX have revealed that NI and ICRH give rise to the same L- and H-mode confinement structures. The dominant confinement regimes of auxiliary heated plasmas are found to be independent of the heating method. Heating in the second harmonic regime, particularly in H/D mixtures has been found as efficient as minority heating, and is, because of its wide insensitivity to the species mix, of particular relevance for application to fusion reactor conditions. Despite the high potential of ICRH to heat large tokamaks, there remain ICRH-specific problems to be resolved, e.g. understanding the mechanism of impurity generation, the understanding of which requires a close investigation of the interaction between RF waves, the plasma boundary, and the walls of fusion devices. As to the impurity problems in particular, no significant increase of the density limit with ICRH power, as compared to NI heating, has so far been observed.
Bibliographic Reference: REPORT IPP III/130, 1988, AVAILABILITY: MAX-PLANCK-INSTITUT, MUENCHEN, D
Record Number: 1989126087000 / Last updated on: 1989-05-01
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