Abstract
Wave absorption in a torus is found to differ significantly from the classical Landau result. Instead of the isolated resonance atv=ω/k, the periodic modulation in particles' parallel velocity gives rise to an infinite, discrete spectrum of resonances. The spread of wave absorption over the velocity space leads to an enhancement in damping for the highphase-velocity waves. This mechanism might provide the resolution of the lower-hybrid current drive spectral-gap anomaly without invoking either a spectral upshift or recourse to an anomalous process.
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I am indebted to Prof. R. Wilhelm for many fruitful discussions as well as for suggesting the applicability of enhanced toroidal Landau damping to LHCD spectral-gap anomaly. I am also thankful to Dr. M. Ballico, Dr. F. Leuterer and Dr. J.-G. Wegrowe for their help.
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Puri, S. Resolution of the lower hybrid current drive spectral-gap anomaly via enhanced toroidal Landau damping. Czech J Phys 43, 631–645 (1993). https://doi.org/10.1007/BF01591538
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DOI: https://doi.org/10.1007/BF01591538