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Observation of tearing mode triggering by sawtooth crash with high-Z impurity accumulation in EAST

Authors :
Shanshan Pan
Yanmin Duan
Liqing Xu
Yan Chao
Hailin Zhao
Haiqing Liu
Shouxin Wang
Ling Zhang
Yuqi Chu
Wenmin Zhang
Kaixuan Ye
Liqun Hu
Source :
AIP Advances, Vol 13, Iss 4, Pp 045108-045108-9 (2023)
Publication Year :
2023
Publisher :
AIP Publishing LLC, 2023.

Abstract

The high-Z impurity accumulation in the plasma core could degrade the plasma performance and may affect sawtooth crash and trigger tearing modes (TMs) in experimental advanced superconducting tokamak (EAST). Triggering of m/n = 3/2 TM (m and n are the poloidal and toroidal mode numbers, respectively) and m/n = 2/1 TM by a large sawtooth crash is observed and studied under the condition of high-Z impurity accumulation in core plasma in EAST tokamak. This work mainly focuses on the relationship among impurity, sawtooth crashes, and TMs. When there is a certain amount of impurity in the plasma core, sawtooth crash leads to impurity transport, resulting the changes in impurity concentration, and by inducing the density perturbation near the rational surface, TMs become destabilized. The experimental analyses indicate that the outward impurity transport after a sawtooth crash plays an important role in the destabilization of TMs.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
13
Issue :
4
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.114b50c1be8d495085186ffa42333cfe
Document Type :
article
Full Text :
https://doi.org/10.1063/5.0141970