Transition from resistive-g to eta-i driven turbulence in stellarator systems

Technical Report · Thu Feb 01 04:00:00 EST 1990

DOI:https://doi.org/10.2172/7055394· OSTI ID:7055394

Hong, B -G ^[1]; Horton, W; Hamaguchi, S ^[2]; Wakantani, M; Yagi, M; Sugama, H ^[3]

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1. ENEA, Frascati (Italy). Centro Ricerche Energia
2. Texas Univ., Austin, TX (USA). Inst. for Fusion Studies
3. Kyoto Univ., Uji (Japan). Plasma Physics Lab.

By an electromagnetic incompressible two fluid model describing both ion temperature gradient drift modes ({eta}{sub i} modes) and resistive interchange modes (g modes), a new type of {eta}{sub i} mode is studied in cylindrical geometry including magnetic shear and an averaged curvature of Heliotron/Torsatron. This {eta}{sub i} mode is destabilized by the coupling to the unstable g mode. Finite plasma pressure beta increases the growth rate of this mode and the radial mode width also increases with plasma pressure beta indicating large anomalous transport in the Heliotron/Torsatron configuration. The transport from {eta}{sub i} mode exceeds that from resistive g when the mean-free-path exceeds the machine circumference. For plasma beta above two to three times the Suydam limit the m = 1/n = 1 growth rate increases from the {eta}{sub i} mode value to the MHD value. 13 refs., 5 figs.

• Research Organization: Texas Univ., Austin, TX (USA). Inst. for Fusion Studies
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG05-80ET53088
• OSTI ID: 7055394
• Report Number(s): DOE/ET/53088-417; IFSR--417; ON: DE90009382
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700103* -- Fusion Energy-- Plasma Research-- Kinetics
700107 -- Fusion Energy-- Plasma Research-- Instabilities
CLOSED PLASMA DEVICES
ECR HEATING
ENERGY DENSITY
FLOW MODELS
FLUID FLOW
HEATING
HELIOTRON
HIGH-FREQUENCY HEATING
INCOMPRESSIBLE FLOW
INSTABILITY
ION TEMPERATURE
MATHEMATICAL MODELS
PLASMA HEATING
PLASMA INSTABILITY
STELLARATORS
TEMPERATURE GRADIENTS
THERMONUCLEAR DEVICES
TORSATRON STELLARATOR
TRANSPORT THEORY
TURBULENCE