Improved Krook model collision operator for trapped-particle mode calculations

Abstract

An improved Krook model collision operator is presented for use in calculations of low-frequency microinstabilities in toroidal geometry. A comparison is made with results from calculations which use a Lorentz collision operator and with a previously employed Krook operator. The results with the new Krook operator agree with the results obtained using the Lorentz operator in the small collision frequency limit, whereas those with the old Krook operator do not.

Keywords

PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA MICROINSTABILITIES
MATHEMATICAL MODELS
EIGENVALUES
INSTABILITY GROWTH RATES
TOROIDAL CONFIGURATION
TRAPPED-PARTICLE INSTABILITY
ANNULAR SPACE
CONFIGURATION
INSTABILITY
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SPACE
* - FUSION ENERGY- PLASMA RESEARCH- INSTABILITIES

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