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Your search keyword '"Yan, L. W."' showing total 15 results
Start Over Author "Yan, L. W." Publisher iop publishing
15 results on '"Yan, L. W."'

1. Divertor detachment of high βNH-mode discharges with the HL-2A closed divertor geometry

Author

Gao, J M, primary, Cai, L Z, additional, Cao, C Z, additional, Ma, H C, additional, Ke, R, additional, Zhong, W L, additional, Wu, N, additional, Hu, Y, additional, Gao, X Y, additional, Cui, C H, additional, Huang, Z H, additional, Nie, L, additional, Liu, L, additional, Yang, Z C, additional, Yu, X, additional, Li, Y G, additional, Jiang, M, additional, Xue, G Q, additional, Shi, Z B, additional, Yan, L W, additional, Ji, X Q, additional, Liu, X L, additional, Wei, H L, additional, Wang, Y Q, additional, and Xu, M, additional

Published
2022
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2. The ITB dynamics controlled by internal kink modes on HL-2A tokamak

Author

He, X X, primary, Yan, L W, additional, Yu, D L, additional, Chen, W, additional, Yu, L M, additional, Ma, Q, additional, Liu, L, additional, Wei, Y L, additional, He, X F, additional, Zhang, N, additional, Li, Y G, additional, Sun, T F, additional, Nie, L, additional, Shi, Z B, additional, Zhong, W L, additional, Xu, M, additional, and Duan, X R, additional

Published
2021
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3. Effects of a coherent mode on the redistribution of divertor particle flux in HL-2A H-mode plasmas

Author

Wu, N, primary, Cheng, J, additional, Yan, L W, additional, Huang, Z H, additional, Xu, J Q, additional, Wang, W C, additional, Ke, R, additional, Yang, Z C, additional, Ji, X Q, additional, Liu, L, additional, He, X X, additional, Jiang, M, additional, Wen, J, additional, Miao, X G, additional, Zhong, W L, additional, Yu, L M, additional, Gao, J M, additional, Dong, Y B, additional, Shi, Z B, additional, Liu, Y, additional, Yang, Q W, additional, Dong, J Q, additional, and Xu, M, additional

Published
2021
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4. The ITB dynamics controlled by internal kink modes on HL-2A tokamak.

Author

He, X X, Yan, L W, Yu, D L, Chen, W, Yu, L M, Ma, Q, Liu, L, Wei, Y L, He, X F, Zhang, N, Li, Y G, Sun, T F, Nie, L, Shi, Z B, Zhong, W L, Xu, M, and Duan, X R

Subjects
*TOKAMAKS, *FUSION reactors, *PLASMA beam injection heating, *INTERNAL auditing, *NEUTRAL beams, *ION temperature, *PLASMA currents
Abstract

The active control of internal transport barriers (ITBs) is an important issue to achieve high performance plasma in a fusion reactor. A critical challenge of ITB control is to increase the ITB position. The ITBs with internal kink modes (IKMs), such as fishbone (FB) instability and long-live mode (LLM) with mode number of m / n = 1/1 are frequently observed on HL-2A tokamak in neutral beam heated discharges. The correlation of FB instability/LLM with ITBs is analyzed in order to extend the ITB radius. It has been revealed that FB instability and LLM are often excited after the ITB formation. Therefore, FB instability and LLM play no role in triggering ITBs on HL-2A tokamak. On the other hand, they may slow down the outward radial expansion and then shrink the foot position of ITB, and damp the gradient growth of ion temperature and rotation velocity. Since the perturbation of LLM is weaker than that of FB instability, the shrinking effect of ITB foot and braking effect on gradient growth are slighter than those of FB instability. Compared with the LLM, FB instability routinely appears in plasmas with lower density, higher heating power and lower plasma current. In addition, large ITBs without IKMs are also discussed on HL-2A tokamak. The large ITB is the largest one, the FB ITB is the strongest one and the LLM ITB is the widest one in three ITBs, where the ‘large’, ‘strong’ and ‘wide’ qualifications correspond to ITB position ρ ITB, the normalized temperature gradient R /LT, and its width W / a. Therefore, the large ITB position may be obtained if the IKMs are effectively controlled in a tokamak. [ABSTRACT FROM AUTHOR]

Published
2022
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6. Roles of turbulence– and pressure-gradient–induced flows in triggering H-mode at marginal heating power on HL-2A tokamak

Author

Cheng, J., primary, Dong, J. Q., additional, Yan, L. W., additional, He, Z. X., additional, Xie, H. S., additional, Xiao, Y., additional, Zhao, K. J., additional, Huang, Z. H., additional, Xu, J. Q., additional, Liu, L., additional, Shi, Z. B., additional, Zhong, W. L., additional, Yu, D. L., additional, Ji, X. Q., additional, Huang, Y., additional, Song, X. M., additional, Yang, Q. W., additional, Ding, X. T., additional, Zou, X. L., additional, and Duan, X. R., additional

Published
2016
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7. Dynamics of low–intermediate–high-confinement transitions in the HL-2A tokamak

Author

Xu, Y, primary, Cheng, J, additional, Dong, J Q, additional, Dong, Y B, additional, Jiang, M, additional, Zhong, W L, additional, Yan, L W, additional, Shi, Z B, additional, Huang, Z H, additional, Li, Y G, additional, Nie, L, additional, Xu, M, additional, Zhao, K J, additional, Ji, X Q, additional, Yu, D L, additional, Liu, Y, additional, Cui, Z Y, additional, Chen, W, additional, Yang, Q W, additional, Ding, X T, additional, Duan, X R, additional, and Liu, Yong, additional

Published
2014
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8. Observation and theory of nonlinear mode couplings between shear Alfvén wave and magnetic island in tokamak plasmas

Author

Chen, W., primary, Qiu, Z., additional, Ding, X. T., additional, Xie, H. S., additional, Yu, L. M., additional, Ji, X. Q., additional, Li, J. X., additional, Li, Y. G., additional, Dong, J. Q., additional, Shi, Z. B., additional, Zhang, Y. P., additional, Cao, J. Y., additional, Song, X. M., additional, Song, S. D., additional, Xu, M., additional, Yang, Q. W., additional, Liu, Yi., additional, Yan, L. W., additional, and Duan, X. R., additional

Published
2014
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9. Intermittent convective transport suppressed by supersonic molecular beam injection on the HL-2A tokamak

Author

Nie, L, primary, Cheng, J, additional, Huang, Y, additional, Yan, L W, additional, Yao, L H, additional, Feng, B B, additional, Dong, J Q, additional, Xu, M, additional, Zhao, K J, additional, Yu, D L, additional, Zhong, W L, additional, Gao, J M, additional, Yuan, C C, additional, Huang, Z H, additional, Kong, D F, additional, Feng, Z, additional, Liu, C H, additional, Yao, K, additional, Shang, J, additional, Yang, Q W, additional, Ding, X T, additional, and Duan, X R, additional

Published
2014
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10. Turbulence and zonal flows in edge plasmas of the HL-2A tokamak

Author

Zhao, K J, primary, Dong, J Q, additional, Yan, L W, additional, Hong, W Y, additional, Fujisawa, A, additional, Yu, C X, additional, Li, Q, additional, Qian, J, additional, Cheng, J, additional, Lan, T, additional, Liu, A D, additional, Zhao, H L, additional, Kong, D F, additional, Huang, Y, additional, Liu, Yi, additional, Song, X M, additional, Yang, Q W, additional, Ding, X T, additional, Duan, X R, additional, and Liu, Yong, additional

Published
2010
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13. Features of spontaneous and pellet-induced ELMs on the HL-2A tokamak.

Author

Huang, Y., Liu, C. H., Nie, L., Feng, Z., Ji, X. Q., Yao, K., Zhu, G. L., Liu, Yi, Cui, Z. Y., Yan, L. W., Wang, Q. M., Yang, Q. W., Ding, X. T., Dong, J. Q., and Duan, X. R.

Subjects
TOKAMAKS, STRUCTURAL plates, ELECTRON distribution, QUANTUM perturbations, PLASMA gases, MAGNETIC fields, OSCILLATIONS
Abstract

The pellet pacing ELM mitigation concept is being tested in some tokamaks such as ASDEX Upgrade, DIII-D and JET. By increasing the ELM frequency, the ELM size can be reduced and eventually suppressed to meet the lifetime requirements on ITER target plates. In the HL-2A tokamak, ELMy H-mode operation is routinely performed and small type-III ELMs with a high repetition rate and some type-I (or possibly large type-III) ELM events are observed. Large ELMs are often preceded by strong coherent magnetic oscillations, and produce obvious perturbations on plasma current Ip, electron density ñedge at the edge, stored energy WE, etc. The coherent magnetic oscillations before an ELM crash or during the ELM are measured by toroidal and poloidal Mirnov coils and analysed by the wavelet technique to study the spectral characteristics of the short time ELM events. Pellet injection experiments are performed in type-III ELMy H-mode plasmas and ELM-free H-mode plasmas to study the physics of pellet triggering ELM. The analyses of pellet-induced ELMs and spontaneous ELMs are presented. Because the pellet size is relatively large, it induces magnetic oscillations lasting longer than that of a natural ELM. [ABSTRACT FROM AUTHOR]

Published
2012
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