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Toroidal microinstability studies of high-temperature tokamaks

1990; American Institute of Physics; Volume: 2; Issue: 2 Linguagem: Inglês

10.1063/1.859320

2163-503X

G. Rewoldt, W. M. Tang,

Fusion materials and technologies

Results from comprehensive kinetic microinstability calculations are presented, showing the effects of toroidicity on the ion temperature gradient mode and its relationship to the trapped-electron mode in high-temperature tokamak plasmas. The corresponding particle and energy fluxes have also been computed. It is found that, although drift-type microinstabilities persist over a wide range of values of the ion temperature gradient parameter ηi≡(d ln Ti/dr)/ (d ln ni/dr), the characteristic features of the dominant mode are those of the ηi-type instability when ηi>ηic∼1.2–1.4 and of the trapped-electron mode when ηi<ηic.