Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Rapid Communications
Improvement of EC-Driven Spherical Tokamak Discharge by a Radial Magnetic Perturbation on Energetic Trapped Electrons
Fumitake WATANABEMasaki UCHIDAHitoshi TANAKATakashi MAEKAWA
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2012 Volume 7 Pages 1202005

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Abstract

Effects of a radial magnetic perturbation (MP) on electron cyclotron (EC) driven fast electrons are investigated in the Low Aspect ratio Torus Experiment (LATE) device. When a weak MP is applied to plasmas maintained solely by EC heating and current drive, plasma current and electron density increase, whereas energetic trapped electrons located outside the last closed flux surface (LCFS) on the low field side (LFS) decrease. The effect of MPs on energetic trapped electrons has an important role in improving EC-driven plasma discharges.

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© 2012 by The Japan Society of Plasma Science and Nuclear Fusion Research
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