Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Effects of Radially Sheared Electric Field on Turbulence Reduction Analyzed with End-Loss Analysing Systems
Mafumi HIRATATeruji CHOJunko KOHAGURATomoharu NUMAKURASerina KIMINAMIMarie ITONaoyuki MORIMOTOKatsuaki HIRAITooru YAMAGISHIToshinori IKUNOShohei NAMIKIYoshiaki MIYATARyutaro MINAMIKazuo OGURATakashi KONDOHTsuyoshi KARIYATsuyoshi IMAISyoichi MIYOSHI
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2007 Volume 2 Pages S1077

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Abstract

Mirror devices, having open-ended regions, provide intrinsic important advantages in terms of the control of radial-potential or Er shear profiles on the basis of axial particle loss control for ambipolar potential formation. From the viewpoint of the mechanism investigation of radially localized transport-barrier formation, an idea of off-axis-resonant electron-cyclotron heating (ECH) is proposed and applied in the tandem mirror GAMMA 10, by the use of the aforementioned intrinsic advantage of mirror devices. The off-axis ECH produces a cylindrical layer with energetic electrons and facilitates the formation for a localized bumped ambipolar potential with a strong shear of radial electric fields Er. Remarkable effects of dEr/dr on the suppression of turbulent fluctuations with plasma confinement improvement are found by the use of signals of end-loss currents flowing from the central cell as well as the central-cell soft x ray. In association with the reduction of the fluctuations due to strong Er shear formation, increases in ion and electron temperatures are found.

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© 2007 by The Japan Society of Plasma Science and Nuclear Fusion Research
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