Change of the resonant electron orbit from trapped orbit to passing orbit in fast wave current drive

Details Change of the resonant electron orbit from trapped orbit to passing orbit in fast wave current drive Change of the resonant electron orbit from trapped orbit to passing orbit in fast wave current drive

2010-03-30

arxiv.org/abs/1003.5719v1

Physics

Plasma Physics

Scientific paper

In fast wave current drive, the resonant electron is accelerated by fast wave in the direction parallel to the static magnetic field, and the parallel velocity will be increased. The trajectories of the trapped resonant electrons are calculated with a computer code in which fast wave-induced diffusion in velocity space is accounted for by a quasi-linear operator. The simulation results show that the orbit of trapped resonant electron will change from a trapped orbit to a passing orbit in some cases. We obtain the transition conditions, and if they are satisfied the trapped orbit will become a passing orbit. The transition from trapped orbit to passing orbit implies that the effect of trapped electrons on current drive will be reduced and the current drive efficiency will be improved.

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