The Korea Superconducting Tokamak Advanced Research (KSTAR)
project is the major effort of the national fusion programme of the Republic of Korea. Its aim is
to develop a steady state capable advanced superconducting tokamak to
establish a scientific and technological basis for an attractive fusion
reactor. The major parameters of the tokamak are: major radius 1.8 m, minor
radius 0.5 m, toroidal field 3.5 T and plasma current 2 MA, with a
strongly shaped plasma cross-section and double null divertor. The initial
pulse length provided by the poloidal magnet system is 20 s, but the pulse
length can be increased to 300 s through non-inductive current drive. The
plasma heating and current drive system consists of neutral beams,
ion cyclotron waves, lower hybrid waves and electron cyclotron waves for
flexible profile control in advanced tokamak operating modes. A
comprehensive set of diagnostics is planned for plasma control,
performance evaluation and physics understanding. The project has
completed its conceptual design and moved to the engineering design and
construction phase. The target date for the first plasma is 2002.
The bounce-averaging procedure for the electron Fokker–Planck equation is extended to the case of nonaxisymmetric geometry, in order to calculate consistently electron ripple-induced losses in tokamak during rf heating and current drive experiments. New explicit expressions for the bounce-averaged coefficients are developed for circulating electrons but also for banana electrons. While the effect of magnetic ripple is fairly negligible for circulating electrons, nonaxisymmetric corrections become significantly larger for banana electrons as compared to the axisymmetric case.
A consistent estimation of the losses of collisionless fast electrons driven by the lower hybrid wave and trapped in magnetic ripples in the Tokamak Tore Supra [Equipe TORE SUPRA, in Proceedings of the 15th Conference on Plasma Physics and Controlled Nuclear Fusion Research, Seville (International Atomic Energy Agency, Vienna, 1995), Vol. 1, IAEA-CN-60/A1-5, p. 105], is carried out using a two-dimensional relativistic bounce-averaged Fokker–Planck solver. A reasonable agreement is found between the simulations and the experimentally observed results obtained by the diagnostic named DRIPPLE (Diagnostic-Ripple) dedicated to magnetic ripple loss measurements. The analysis shows that the radial profile of the ripple loss current is dominated by the shape of the supertrapped domain in momentum space, and is therefore weakly dependent on the lower hybrid wave power absorption.
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