Abstract
The linear stability of the collisionless trapped electron mode (“ubiquitous mode”) is investigated for the case of multispecies plasmas in low-β toroidal magnetic confinement experiments (JET and TFTR). A moderate reduction in the growth rate of fluctuations with given poloidal wavelength is observed when a heavier ion than the fuelling species, e.g. deuterium, is introduced. The quasilinear energy and particle fluxes are computed for the saturated state, and a model for the observed “isotopic scaling” of transport with the mass of the fuelling ion is presented.
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