Transition from resistive-g to eta-i driven turbulence in stellarator systems
- ENEA, Frascati (Italy). Centro Ricerche Energia
- Texas Univ., Austin, TX (USA). Inst. for Fusion Studies
- 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; TRN: 90-010524
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STELLARATORS
TRANSPORT THEORY
ECR HEATING
ENERGY DENSITY
FLOW MODELS
HELIOTRON
INCOMPRESSIBLE FLOW
ION TEMPERATURE
PLASMA INSTABILITY
TEMPERATURE GRADIENTS
TORSATRON STELLARATOR
TURBULENCE
CLOSED PLASMA DEVICES
FLUID FLOW
HEATING
HIGH-FREQUENCY HEATING
INSTABILITY
MATHEMATICAL MODELS
PLASMA HEATING
THERMONUCLEAR DEVICES
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