[Table of Contents]

Plasma and Fusion Research

Volume 5, 025 (2010)

Regular Articles

Change of Resonant Electron Orbits from Trapped to Passing in Fast Wave Current Drive
Kun YAO and Yanping ZHAO
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China
(Received 19 April 2010 / Accepted 19 May 2010 / Published 9 July 2010)

Abstract

In fast wave current drive, fast waves accelerate resonant electrons in the direction parallel to the static magnetic field, causing parallel velocity to increase. The trajectory of a trapped resonant electron is calculated by computer code in which fast wave induced diffusion in velocity space is accounted for by a quasi-linear operator. Simulations show that the orbit of a trapped resonant electron transits from trapped to passing in some cases, reducing the effect of trapped electrons on current drive and improving current-drive efficiency. We determined the conditions under which this type of transition occurs.

Keywords

fast wave current drive, resonant electron, electron orbit

DOI: 10.1585/pfr.5.025

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This paper may be cited as follows:

Kun YAO and Yanping ZHAO, Plasma Fusion Res. 5, 025 (2010).