Evolution of turbulence characteristics in the pre-precursor phase of tearing mode included disruption in the core of EAST

被引：1

作者：

Wang, Y. H. ^{[1
,2
]}

Li, Y. D. ^{[1
]}

Wu, G. J. ^{[1
]}

Li, P. ^{[1
]}

Zeng, L. ^{[1
]}

Zhao, H. L. ^{[1
]}

Mai, C. W. ^{[1
,2
]}

Geng, J. S. ^{[1
,2
]}

Chen, F. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China

[2] Univ Sci & Technol China, Hefei 230026, Peoples R China

来源：

PHYSICA SCRIPTA | 2023年 / 98卷 / 04期

基金：

国家重点研发计划;

关键词：

disruption; electron-scale turbulence; predicting disruption; tearing mode;

D O I：

10.1088/1402-4896/acc286

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Avoiding the plasma instability, especially the disruption instability, is an important problem for the stable operation of tokamak. Large-scale instabilities driven by free energy evolve nonlinearly and lead to the disruption. The microscale turbulence is highly sensitive to the change of free energy. The paper show the electron-scale turbulence evolution in the pre-precursor phase of TMs included disruption with the CO2 laser coherent scattering system in EAST. In the pre-precursor phase of disruption, it is observed that the characteristics of turbulence (e.g. intensity, spatial correlation) have obviously changed for more than 30 ms. In addition, before TM (n = 1) included major disruption, the spatial correlation of turbulence in two regions (? = 0-0.4 and ? = 0.4-0.8) increase obviously, while opposite turbulence spatial-correlation evolution was observed before TM (n = 1) included minor disruption. The warning time for disruption with microscale turbulence is competitive while 30 ms for ITER. According to the experimental results in EAST, it may provide a new experimental evidence for the method improvement of predicting disruption.

引用

页数：7