An overview of recent HL-2A experiments
| Autor: | Duan, XR, Ding, XT, Dong, JQ, Yan, LW, Liu, Y, Huang, Y, Song, XM, Zou, XL, Xu, M, Yang, QW, Liu, DQ, Rao, J, Xuan, WM, Chen, LY, Mao, WC, Wang, QM, Cao, Z, Li, B, Cao, JY, Lei, GJ, Zhang, JH, Li, XD, Chen, W, Zhao, KJ, Xiao, WW, Chen, CY, Kong, DF, Isobe, M, Morita, S, Cheng, J, Chen, SY, Cui, CH, Cui, ZY, Deng, W, Dong, YB, Feng, BB, Hong, WY, Huang, M, Ji, XQ, Li, GS, Li, HJ, Li, Q, Liu, CH, Peng, JF, Shi, BZ, Wang, YQ, Yao, LH, Yao, LY, Yu, DL, Yu, LM, Yuan, BS, Zhou, J, Zhou, Y, Zhong, WL, Tynan, G, Diamond, P, Yu, CX |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Duan, XR; Ding, XT; Dong, JQ; Yan, LW; Liu, Y; Huang, Y; et al.(2013). An overview of recent HL-2A experiments. Nuclear Fusion, 53(10). doi: 10.1088/0029-5515/53/10/104009. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/1sw9x42c Nuclear Fusion, vol 53, 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 Alfvén 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. © 2013 IAEA, Vienna. |
| Databáze: | OpenAIRE |
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