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Abstract. The 6 beam 2nd harmonic X-mode (X2), 3MW, ECH/ECCD system of the
TCV tokamak allows a fine tailoring of the deposition profiles in the
plasma. The sensitivity of the sawtooth period to the deposition location is
used to increase the equilibria reconstruction and ray-tracing accuracy.
Off-axis ECH, followed by on-axis counter-ECCD produces improved central
confinement regimes in which
exceeds RLW scaling by a factor
of 3.5. The PRETOR transport code (incorporating an RLW local transport
model but constrained by the experimental density profiles) predicts an
extreme sensitivity of
to the deposition location of the
counter-ECCD. This is confirmed by experiments. Sawtooth simulations using
PRETOR, including the effects of current drive with inputs from the TORAY
ray-tracing code, are in good agreement with experimental results. These
results are an initial benchmark for the package of analysis codes, LIUQE /
TORAY / PRETOR used during ECH/ECCD experiments on TCV.
IAEA 2001