3-D simulations of limiter stabilization of high-beta external kink-tearing modes
The effects of finite-size poloidal limiters, toroidal limiters, and general mushroom limiters are examined for high-beta finite-resistivity tokamak plamas in free boundary. Even for a linear stability analysis, a 3-D simulation is necessary, in which many poloidal and toroidal modes are coupled because of the limiter constraint and finite-beta. When the plasma pressure and resistivity are small, a poloidal limiter is effective in reducing the growth rate with a small limiter-size, while a toroidal limiter requires a large size for a comparable effect. As the plasma pressure or resistivity increases, a toroidal limiter becomes more effective in reducing the growth rate than a poloidal limiter of the same size. A small optimized mushroom limiter might have a stabilizing effect similar to a conducting shell.
- Research Organization:
- GA Technologies, Inc., San Diego, CA (USA)
- DOE Contract Number:
- AT03-84ER53158
- OSTI ID:
- 5144073
- Report Number(s):
- GA-A-17503; CONF-840370-2; ON: DE84009400
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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CLOSED PLASMA DEVICES
HIGH-BETA PLASMA
INSTABILITY
KINK INSTABILITY
LIMITERS
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SIMULATION
STABILIZATION
TEARING INSTABILITY
THERMONUCLEAR DEVICES
THREE-DIMENSIONAL CALCULATIONS
TOKAMAK DEVICES