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Profile control with lower hybrid waves on ASDEX

F.X. Soldner, F. Leuterer, R. Bartiromo, S. Bernabei, R. Buchse, O. Gehre, R.W. Harvey, M. Kornherr, K. McCormick, H.D. Murmann and G.V. Pereverzev

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Controlled modification of the radial profiles of the plasma current, electron temperature and density was achieved in the ASDEX divertor tokamak with lower hybrid waves. Variation of the lower hybrid power and current deposition profiles was accomplished by tailoring the launched wave spectra or by compound antenna phasing. The current and temperature profiles could be largely decoupled. MHD modes were strongly influenced by the current profile modifications. Sawteeth and m=1 modes were suppressed up to the density limit of lower hybrid current drive on ASDEX (ne=5*1019 m-3). The electron temperature profile peaked in this case and the global confinement was improved

PACS

52.35.Hr Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid)

52.55.Rk Power exhaust; divertors

52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

52.55.Wq Current drive; helicity injection

52.55.Fa Tokamaks, spherical tokamaks

52.40.Fd Plasma interactions with antennas; plasma-filled waveguides

Subjects

Plasma physics

Dates

Issue 7 (July 1994)



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