Dependence of heat and particle transport on the ratio of the ion and electron temperatures

Experiments in high confinement (H-mode) plasmas on the DIII-D tokamak show that the heat and particle transport are sensitive to the ratio of the ion and electron temperatures. Increasing the ion-to-electron temperature ratio decreases the electron and ion heat transport and the particle transport regardless of which temperature is being varied. A likely explanation of these results is the dependence of the ion-temperature-gradient instability on the ratio of the ion and electron temperatures.