Study of the mechanism of ITB formation and sustainment with optimized q profiles in ELMy H mode discharges on the EAST

Y. Q. Chu, H. Q. Liu, S. B. Zhang, Y. X. Jie, H. Lian, M. Q. Wu, X. Zhu, C. B. Wu, L. Q. Xu, Y. F. Wang, S. X. Wang, T. Zhang, Y. Yang, K. Hanada, B. Lyu, Y. Y. Li, Q. Zang

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, improved confinement plasma with the internal transport barrier (ITB) on the Experimental Advanced Superconducting Tokamak has been achieved through extensive experiments in high β N scenario development. ELMy H-mode plasmas are heated by lower hybrid wave and neutral beam injection, with B T = 1.6 T, I p = 400/450 kA and q 95 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 n e channel has great relationship with magnetohydrodynamics (MHD) behaviors. For T e channel, q profile has a dominating effect. Reversal magnetic shear and MHD behaviors are both effective in T i 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.

Original languageEnglish
Article number105003
JournalPlasma Physics and Controlled Fusion
Volume63
Issue number10
DOIs
Publication statusPublished - Oct 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Study of the mechanism of ITB formation and sustainment with optimized q profiles in ELMy H mode discharges on the EAST'. Together they form a unique fingerprint.

Cite this