Overview of recent HL-2A experiments

Autor: Hl A Team, Yves Peysson, Y.P. Zhang, Qing Li, Chen Lei, B.B. Feng, Y. H. Zhou, T. Hoang, Y.G. Li, X.L. Zou, Yan Wang, X.Q. Ji, Q.W. Yang, Z.Y. Cui, Haifeng Li, Yi Liu, Annika Ekedahl, Q.M. Wang, L.W. Yan, M. Isobe, J. Rao, M. Huang, G.L. Xiao, Xiaomei Li, M. Xu, Z. Cao, J. Cheng, D.Q. Liu, Yong Liu, C.H. Cui, D. Mazon, W.C. Mao, Katsumi Ida, Kimitaka Itoh, Q. J. Li, G.Y. Zheng, B.S. Yuan, B. Lu, Lena Delpech, Shigeru Inagaki, J.Q. Dong, Z.B. Shi, K.J. Zhao, Wulyu Zhong, Bing Li, W.M. Xuan, Wei Chen, S.-I. Itoh, Shigeru Morita, J.F. Peng, Jian-Hui Zhang, G.S. Li, X.M. Song, Patrick Diamond, X.Y. Bai, Dan Yu, X.R. Duan, Yueqiang Liu, Yin Xu, Jun-Jie Cao, G.J. Lei, Liming Yu, Y.B. Dong, Xiaogang Wang, X.T. Ding, Yanping Huang
Rok vydání: 2017
Předmět:
Zdroj: NUCLEAR FUSION, vol 57, iss 10
Popis: For the first time supersonic molecular beam injection (SMBI) and cluster jet injection (CJI) were applied to mitigate edge-localized modes (ELMs) in HL-2A successfully. The ELM frequency increased by a factor of 2–3 and the heat flux on the divertor target plates decreased by 50% on average after SMBI or CJI. Energetic particle induced modes were observed in different frequency ranges with high-power electron cyclotron resonance heating (ECRH). The high frequency (200–350 kHz) of the modes with a relatively small amplitude was close to the gap frequency of the toroidicity-induced Alfven eigenmode. The coexistent multi-mode magnetic structures in the high-temperature and low-collision plasma could affect the plasma transport dramatically. Long-lived saturated ideal magnetohydrodynamic instabilities during strong neutral beam injection heating could be suppressed by high-power ECRH. The absolute rate of nonlinear energy transfer between turbulence and zonal flows was measured and the secondary mode competition between low-frequency (LF) zonal flows (ZFs) and geodesic acoustic modes (GAMs) was identified, which demonstrated that ZFs played an important role in the L–H transition. The spontaneously generated E × B shear flow was identified to be responsible for the generation of a large-scale coherent structure (LSCS), which provided unambiguous experimental evidence for the LSCS generation mechanism. New meso-scale electric potential fluctuations (MSEFs) at frequency f ∼ 10.5 kHz with two components of n = 0 and m/n = 6/2 were also identified in the edge plasmas for the first time. The MSEFs coexisted and interacted with magnetic islands of m/n = 6/2, turbulence and LF ZFs.
Databáze: OpenAIRE
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