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Efficiency of LH+EC current drive in tokamaks featuring an internal transport barrier

By Paulo Ricardo da Silva Rosa, Luiz Fernando Ziebell, Clesio Ismerio de Oliveira, Gleison Nunes Jardim and Aline Kassab Bonfim


In the present paper we study the effects due to the occurrence of radial transport of particles in a tokamak on the efficiency of current drive due to combined action of lower hybrid waves and electron cyclotron waves, in the presence of an internal transport barrier. The results are obtained by numerical solution of the Fokker-Planck equation which rules the evolution of the electron distribution function. We assume that the radial transport of particles can be due to magnetic or to electrostatic fluctuations, and compare the two situations. In both cases the efficiency of current drive is shown to increase with the increase of the fluctuations which originate the transport. The current drive efficiency is shown to depend weakly on the radial position of the barrier, with a slightly more pronounced dependence in the case of magnetic fluctuations

Topics: Física
Year: 2013
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