Ti/Te effects on transport in EAST low q95 plasmas

oleh: Y.F. He, J.P. Qian, J.G. Li, P. Li, X.Z. Gong, B. Zhang, J.Y. Zhang, J.L. Chen, Cheonho Bae, M.Q. Wu, X.D. Yang, T.Q. Jia, G.S. Li, Y.F. Jin, Z.C. Lin, S.Y. Fu, G.L. Lin, Q. Zang, G.Q. Zhong, S.X. Wang, X. Li, J. Huang

Format: Article
Diterbitkan: IOP Publishing 2024-01-01

Deskripsi

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 ${H_{98y2}}$ 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.