T_i/T_e effects on transport in EAST low q₉₅ plasmas

Enhanced confinement is observed in EAST low q 95 ( q 95 < 3.5 ) plasmas with the temperature ratio ( T i / T e ) increasing. A statistically significant positive correlation between H 98 y 2 and T i / T e has been established. Increased T i triggerd by Neutral Beam Injection in experiments maintaining constant T e leads initially to an improved T i / T e ratio, which subsequently mitigates heat transport in the ion channel. The Trapped Gyro-Landau Fluid transport model was applied to analyse the dependence of the turbulent transport on T i / T e . Simulation results demonstrate that the Ion Temperature Gradient mode is stabilized in high T i / T e plasma, with ion flux results from predictive modelling further validating this effect. These findings corroborate the Weiland model and complement one another. This study contributes to a deeper understanding of how the dimensionless parameter T i / T e influences plasma transport, and helps demonstrate the feasibility of operations under the low q 95 condition required for the ITER-inductive scenario in the new T i / T e regime.