Current drive due to localized electron cyclotron power deposition in DIII-D

Details Current drive due to localized electron cyclotron power deposition in DIII-D Current drive due to localized electron cyclotron power deposition in DIII-D

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..485..253h&link_type=abstract

The thirteenth topical conference on radio frequency power in plasmas. AIP Conference Proceedings, Volume 485, pp. 253-256 (199

Computer Science

1

Plasma Heating By Particle Beams, Tokamaks, Spherical Tokamaks, Theory, Design, And Computerized Simulation

Scientific paper

Due to spatial localization of electron cyclotron wave injection in DIII-D, electrons heated in an off-axis region must toroidally transit the tokamak 25-50 times before re-entering the heating region. This distance is of the order of the mean free path. The effect of such RF localization is simulated with a time-dependent Fokker-Planck code which is 2D-in-velocity, 1D-in-space-along-B, and periodic in space. An effective parallel electric field arises to maintain continuity of the driven current. Somewhat suprisingly, the localized current drive efficiency remains equal to that for a uniform medium.

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