Fast ions raise the ITG threshold favorably with strong dependence on their density fraction and mostly favorable dependence on temperature ratio, while lowering the ETG threshold; a compact analytic expression is given for the ITG critical gradient in the large fast-ion gyroradius limit.
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Fast ion effects on the threshold conditions of ion temperature gradient mode and electron temperature gradient mode
Fast ions raise the ITG threshold favorably with strong dependence on their density fraction and mostly favorable dependence on temperature ratio, while lowering the ETG threshold; a compact analytic expression is given for the ITG critical gradient in the large fast-ion gyroradius limit.