T i /T e effects on transport in EAST low q 95 plasmas

• Published in: Nuclear fusion Vol. 64; no. 7; p. 76064
• Main Authors: He, Y.F., Qian, J.P., Li, J.G., Li, P., Gong, X.Z., Zhang, B., Zhang, J.Y., Chen, J.L., Bae, Cheonho, Wu, M.Q., Yang, X.D., Jia, T.Q., Li, G.S., Jin, Y.F., Lin, Z.C., Fu, S.Y., Lin, G.L., Zang, Q., Zhong, G.Q., Wang, S.X., Li, X., Huang, J.
• Format: Journal Article
• Language: English
• Published: 01.07.2024
• ISSN: 0029-5515; 1741-4326
• DOI: 10.1088/1741-4326/ad5363

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.