Resistive interchange instabilities in heliotron E

Conference · Sun May 01 04:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6930015

Wakatani, M ^[1]

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1. Plasma Physics Laboratory, Kyoto University, Gokasho, Uji (Japan)

In Heliotron E resistive interchange (or [ital g]) modes are unstable even for sufficiently low beta plasmas, since magnetic hill governs a substantial region of the plasma column. From linear theory of [ital g] modes, both low and high-[ital m] modes are relevant to present experiments, where [ital m] is a poloidal mode number in the cylindrical plasma limit. Evidence of low-[ital m] [ital g] mode is clearly seen in the pressure driven sawtooth oscillations observed in Heliotron [ital E]. This phenomena are well explained by the nonlinear evolution of low-[ital m] [ital g] mode. Unstable high-[ital m] [ital g] modes may show turbulent behavior in Heliotron [ital E]. Nonlinear theory of [ital g] mode turbulence and predicted anomalous transport are briefly reviewed. Also theoretical models are extended to include coupling to resistive drift waves and ion temperature gradient (or [eta][sub [ital i]]) modes, and to study poloidal shear flow effect. Recent measurements of density and magnetic field fluctuations are compared with the theoretical predictions for the [ital g] mode turbulence qualitatively. The anomalous edge transport seems to be induced by the [ital g] mode turbulence.

• OSTI ID: 6930015
• Report Number(s): CONF-9301107--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 284:1
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330 -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
CLOSED PLASMA DEVICES
DRIFT INSTABILITY
HELIOTRON
INSTABILITY
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
REYNOLDS NUMBER
STELLARATORS
TEMPERATURE GRADIENTS
THERMONUCLEAR DEVICES
TRANSPORT THEORY
TURBULENCE