Recently, improved confinement plasma with the internal transport barrier (ITB) on the Experimental Advanced Superconducting Tokamak has been achieved through extensive experiments in high βN scenario development. ELMy H-mode plasmas are heated by lower hybrid wave and neutral beam injection, with BT = 1.6 T, Ip = 400/450 kA and q95 in the range 3.7–4.6. ITB with optimized reversal q profiles and central flat q profiles are observed in these H-mode plasmas, which lead to better confinement. The electron temperature ITB, ion temperature ITB, and electron density ITB exhibit different characteristics. In this paper, the formation and sustainment of ITB on ne channel has great relationship with magnetohydrodynamics (MHD) behaviors. For Te channel, q profile has a dominating effect. Reversal magnetic shear and MHD behaviors are both effective in Ti ITB formation. Suppression of turbulence in the ITB region is the common reason on all the channels. In addition, the power threshold of the ITB formation should be concentrated on electrons and ions separately. The results of this study can widen the understanding of ITB and be helpful in exploring better candidate operational scenarios for future fusion devices.
最近，在实验先进超导托卡马克（EAST）上，通过在高βN情景开发中的广泛实验，实现了具有内部输运垒（ITB）的改善约束等离子体。ELMy H模等离子体由低杂波和中性束注入加热，其参数为BT = 1.6 T，Ip = 400/450 kA，q95在3.7–4.6范围内。在这些H模等离子体中观察到具有优化反剪切q分布和中心平坦q分布的ITB，这些分布导致了更好的约束性能。电子温度ITB、离子温度ITB和电子密度ITB表现出不同的特征。在本文中，ne通道上ITB的形成与维持与磁流体动力学（MHD）行为密切相关。对于Te通道，q分布具有主导作用。反剪切磁结构和MHD行为对Ti ITB的形成均有效。在所有通道中，ITB区域湍流的抑制是共同的原因。此外，ITB形成的功率阈值应分别针对电子和离子进行考虑。本研究的结果可以拓宽对ITB的理解，并有助于为未来聚变装置探索更优的运行情景。