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Injection of vanadium ions by the laser blow-off technique has permitted to modify at will the impurity content in TFR plasmas prior to ion - cyclotron resonance (ICR) heating experiments in the mode conversion regime. The initial rate of increase of the central deuteron temperature T-D(O) has thus been enhanced. By solving the wave propagation equation in the WKB approximation, it has been possible to account for the enhanced dT-D(O)/dt value by wave energy deposition on resonating V-21+ ions, provided a fraction (of the order of 10%) of these ions has been accelerated to the tens of keV range. Previous experimental ICR heating results, in conditions such that the proton cyclotron layer is outside the limiter radius, can be explained by similar resonance processes on intrinsic metal impurity ions.

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Bibliographic Reference: WRITE TO CEA MENTIONING REPORT EUR-CEA-FC-1283 EN, 1985
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