Bibliographic Details
| Title: |
Recent advances in high-βN experiments and magnetohydrodynamic instabilities with hybrid scenarios in the HL-2A Tokamak |
| Authors: |
Wei Chen, Liming Yu, Min Xu, Xiaoquan Ji, Zhongbing Shi, Xiaoxue He, Zhengji Li, Yonggao Li, Tianbo Wang, Min Jiang, Shaobo Gong, Jie Wen, Peiwan Shi, Zengchen Yang, Kairui Fang, Jia Li, Lai Wei, Wulv Zhong, Aiping Sun, Jianyong Cao, Xingyu Bai, Jiquan Li, Xuantong Ding, Jiaqi Dong, Qingwei Yang, Yi Liu, Longwen Yan, Zhengxiong Wang, Xuanru Duan |
| Source: |
Fundamental Research, Vol 2, Iss 5, Pp 667-673 (2022) |
| Publisher Information: |
KeAi Communications Co. Ltd., 2022. |
| Publication Year: |
2022 |
| Collection: |
LCC:Science (General) |
| Subject Terms: |
High-βN, Transport barrier, Hybrid scenario, Bootstrap current, Magnetohydrodynamic, Science (General), Q1-390 |
| More Details: |
Over the past several years, high-βN experiments have been carried out on HL-2A. The high-βN is realized using double transport barriers (DTBs) with hybrid scenarios. A stationary high-βN (>2) scenario was obtained by pure neutral-beam injection (NBI) heating. Transient high performance was also achieved, corresponding to βN≥3, ne/neG∼0.6, H98∼1.5, fbs∼30%, q95∼4.0, and G∼0.4. The high-βN scenario was successfully modeled using integrated simulation codes, that is, the one modeling framework for integrated tasks (OMFIT). In high-βN plasmas, magnetohydrodynamic (MHD) instabilities are abundant, including low-frequency global MHD oscillation with n = 1, high-frequency coherent mode (HCM) at the edge, and neoclassical tearing mode (NTM) and Alfvénic modes in the core. In some high-βN discharges, it is observed that the NTMs with m/n=3/2 limit the growth of the plasma energy and decrease βN. The low-n global MHD oscillation is consistent with the coupling of destabilized internal (m/n = 1/1) and external (m/n = 3/1 or 4/1) modes, and plays a crucial role in triggering the onset of ELMs. Achieving high-βN on HL-2A suggests that core-edge interplay is key to the plasma confinement enhancement mechanism. Experiments to enhance βN will contribute to future plasma operation, such as international thermonuclear experimental reactor . |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2667-3258 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2667325822000024; https://doaj.org/toc/2667-3258 |
| DOI: |
10.1016/j.fmre.2021.12.011 |
| Access URL: |
https://doaj.org/article/d32dc83cd332468f8afe3f080eea397b |
| Accession Number: |
edsdoj.32dc83cd332468f8afe3f080eea397b |
| Database: |
Directory of Open Access Journals |
