Abstract
Abstract
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.
Funder
the National MCF Energy R&D Program
the National Natural Science Foundation of China under Contract