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20 results on '"Lan, T."'

3. Dynamics of L–H transition and I-phase in EAST

Author

Xu, GS, Wang, HQ, Xu, M, Wan, BN, Guo, HY, Diamond, PH, Tynan, GR, Chen, R, Yan, N, Kong, DF, Zhao, HL, Liu, AD, Lan, T, Naulin, V, Nielsen, AH, Rasmussen, J Juul, Miki, K, Manz, P, Zhang, W, Wang, L, Shao, LM, Liu, SC, Chen, L, Ding, SY, Zhao, N, Li, YL, Liu, YL, Hu, GH, Wu, XQ, and Gong, XZ

Subjects
L-H transition, I-phase, reciprocating probe, zonal flows, Reynolds stress, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

The turbulence and flows at the plasma edge during the L-I-H, L-I-L and single-step L-H transitions have been measured directly using two reciprocating Langmuir probe systems at the outer midplane with several newly designed probe arrays in the EAST superconducting tokamak. The E× B velocity, turbulence level and turbulent Reynolds stress at ∼1cm inside the separatrix ramp-up in the last ∼20ms preceding the single-step L-H transition, but remain nearly constant near the separatrix, indicating an increase in the radial gradients at the plasma edge. The kinetic energy transfer rate from the edge turbulence to the E×B flows is significantly enhanced only in the last ∼10ms and peaks just prior to the L-H transition. The E×B velocity measured inside the separatrix, which is typically in the electron diamagnetic drift direction in the L-mode, decays towards the ion diamagnetic drift direction in response to fluctuation suppression at the onset of the single-step L-H, L-I-L as well as L-I-H transitions. One important distinction between the L-I-H and the L-I-L transitions has been observed, with respect to the evolution of the edge pressure gradient and mean E×B flow during the I-phase. Both of them ramp up gradually during the L-I-H transition, but change little during the L-I-L transition, which may indicate that a gradual buildup of the edge pedestal and mean E×B flow during the I-phase leads to the final transition into the H-mode. In addition, the transition data in EAST strongly suggest that the divertor pumping capability is an important ingredient in determining the transition behaviour and power threshold.

Published
2014

4. Dynamics between toroidal Alfvén eigenmode evolution and turbulence suppression under resonant magnetic perturbations on EAST

Author

Li, P., primary, Li, Y.D., additional, Li, J.G., additional, Wu, G.J., additional, Chen, W., additional, Geng, J.S., additional, Chen, F., additional, Wang, Y.H., additional, Zhang, B., additional, Xu, L.Q., additional, Sun, P.J., additional, Li, E.Z., additional, Lan, T., additional, Hansjuergens, H., additional, Chu, Y.Q., additional, Hu, Y.J., additional, Li, Y.Y., additional, Lu, B., additional, Zang, Q., additional, and Liu, H.Q., additional

Published
2021
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5. Fluctuation-induced inward particle flux during L–I–H transition on HL-2A tokamak

Author

Wu, J., primary, Lan, T., additional, Ding, W.X., additional, Zhuang, G., additional, Yu, C.X., additional, Xu, M., additional, Nie, L., additional, Wu, J.R., additional, Sheng, H.G., additional, Chen, W., additional, Yu, L.M., additional, Cheng, J., additional, Yan, L.W., additional, Deng, T.J., additional, Xu, H.Q., additional, Zhu, J.F., additional, Zhang, S., additional, Mao, W.Z., additional, Yu, Y., additional, Sun, X., additional, Liu, A.D., additional, Xie, J.L., additional, Li, H., additional, Duan, X.R., additional, and Liu, W.D., additional

Published
2021
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6. Experimental identification of edge temperature ring oscillation and alternating turbulence transitions near the pedestal top for sustaining stationary I-mode

Author

Liu, A.D., primary, Zou, X.L., additional, Han, M.K., additional, Wang, T.B., additional, Zhou, C., additional, Wang, M.Y., additional, Duan, Y.M., additional, Verdoolaege, G., additional, Dong, J.Q., additional, Wang, Z.X., additional, Xi, F., additional, Xie, J.L., additional, Zhuang, G., additional, Ding, W.X., additional, Zhang, S.B., additional, Liu, Y., additional, Liu, H.Q., additional, Wang, L., additional, Li, Y.Y., additional, Wang, Y.M., additional, Lv, B., additional, Hu, G.H., additional, Zhang, Q., additional, Wang, S.X., additional, Zhao, H.L., additional, Qu, C.M., additional, Liu, Z.X., additional, Liu, Z.Y., additional, Zhang, J., additional, Ji, J.X., additional, Zhong, X.M., additional, Lan, T., additional, Li, H., additional, Mao, W.Z., additional, and Liu, W.D., additional

Published
2020
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7. Power threshold and confinement of the I-mode in the EAST tokamak

Author

Liu, Y.J., primary, Liu, Z.X., additional, Liu, A.D., additional, Zhou, C., additional, Feng, X., additional, Yang, Y., additional, Zhang, T., additional, Xia, T.Y., additional, Liu, H.Q., additional, Wu, M.Q., additional, Zou, X.L., additional, Kong, D.F., additional, Li, H., additional, Xie, J.L., additional, Lan, T., additional, Mao, W.Z., additional, Zhang, S.B., additional, Ding, W.X., additional, Zhuang, G., additional, and Liu, W.D., additional

Published
2020
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9. I-mode investigation on the Experimental Advanced Superconducting Tokamak

Author

Feng, X., primary, Liu, A.D., additional, Zhou, C., additional, Liu, Z.X., additional, Wang, M.Y., additional, Zhuang, G., additional, Zou, X.L., additional, Wang, T.B., additional, Zhang, Y.Z., additional, Xie, J.L., additional, Liu, H.Q., additional, Zhang, T., additional, Liu, Y., additional, Duan, Y.M., additional, Hu, L.Q., additional, Hu, G.H., additional, Kong, D.F., additional, Wang, S.X., additional, Zhao, H.L., additional, Li, Y.Y., additional, Shao, L.M., additional, Xia, T.Y., additional, Ding, W.X., additional, Lan, T., additional, Li, H., additional, Mao, W.Z., additional, Liu, W.D., additional, Gao, X., additional, Li, J.G., additional, Zhang, S.B., additional, Zhang, X.H., additional, Liu, Z.Y., additional, Qu, C.M., additional, Zhang, S., additional, Zhang, J., additional, Ji, J.X., additional, Fan, H.R., additional, and Zhong, X.M., additional

Published
2019
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10. Experimental observation and simulation analysis of the relationship between the fishbone and ITB formation on EAST tokamak.

Author

Liu, Z.X., Ge, W.L., Wang, F., Liu, Y.J., Yang, Y., Wu, M.Q., Wang, Z.X., Zhang, X.X., Li, H., Xie, J.L., Lan, T., Mao, Wenzhe, Liu, A.D., Zhou, C., Ding, W.X., Zhuang, G., Liu, W.D., and team, the EAST

Subjects
FAST ions, MAGNETOHYDRODYNAMIC instabilities, HYBRID computer simulation, DISTRIBUTION (Probability theory), ION energy, PLASMA turbulence
Abstract

A strong relationship between the fishbone instability and internal transport barrier (ITB) formation has been found on the Experimental Advanced Superconducting Tokamak (EAST) in high βN ELMy H-mode discharges. ITB formation always appears after the fishbone instability, and the fishbone disappears when the ITB grows to a certain extent. Hybrid simulations with the global kinetic-magnetohydrodynamic (MHD) code M3D-K have been carried out to investigate the linear stability and non-linear dynamics of beam-driven fishbone instabilities in these shots. The simulation results show that the fishbone instability absorbs the energy of the fast ions and changes the distribution function of the fast ions, leading to the accumulation of fast ions near the ITB, which might eventually assist in the formation of the ITB. The q = 1 surface disappearance caused by the bootstrap current generated by the steep pressure gradient in the ITB region has been considered as the reason for the fishbone instability vanishing. This process has also been reproduced in simulation. However, the timescale of this change in the q profile is not sufficient under classical current diffusion times. The simulation utilizes another assumption explaining the disappearance of the fishbone instability. The density will form a barrier in the ITB region, which should broaden the distribution of the fast ions, and the broadening profile of the distribution of the fast ion mitigates the growth of the fishbone instability. [ABSTRACT FROM AUTHOR]

Published
2020
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11. Study of turbulence modulation and core density peaking with CO2 laser collective scattering diagnostics in the EAST tokamak.

Author

Li, P., Li, Y.D., Li, J.G., Wu, G.J., Lan, T., Zhang, B., Geng, J.S., Zhang, Y.K., Xu, L.Q., Wang, H.L., and Liu, H.Q.

Subjects
PLASMA turbulence, ELECTRON cyclotron resonance heating, REYNOLDS stress, TURBULENCE, CONTROLLED fusion, PLASMA flow
Abstract

We report experiments designed to help us understand the interaction between electron-scale turbulence and plasma poloidal flow in tokamaks. Multiple electron-scale turbulence (for) in the plasma radial region (ρ = 0–0.8) is simultaneously monitored by CO2 laser collective scattering diagnostics in the EAST tokamak. In the stable discharge phase with electron cyclotron resonance heating (ECRH) power modulation and constant neutral beam injection (NBI), a periodic change in the core density peaking factor can be obtained. We note that the intensity of turbulence and the core density peaking factor show a negative correlation, while the poloidal rotation speed is inversely proportional to the intensity of electron-scale turbulence. The correlation between turbulence and plasma flow is found to be closely related to the density peaking factor. The quasi-linear theory of electron-scale turbulence-driven intrinsic poloidal rotation is adopted, and it shows that plasma flow may exhaust the free energy of turbulence through Reynolds stress. Besides, by comparing the plasma flow shear and spatial cross-correlation of turbulence we observed that the spatial structure of turbulence at is more sensitive to flow shear than that of turbulence at. The possible mechanism for controlling the core density peaking, together with the unchanged density gradient in the outer plasma region 0.5–0.8) are favorable for controlling the fusion reaction rate if they can be extrapolated to burning plasma. The results for ECRH power modulation experiments without NBI are listed and analyzed simultaneously; these serve as a comparison and enrich the physical picture. [ABSTRACT FROM AUTHOR]

Published
2020
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12. Investigation of the geodesic acoustic mode in EAST H-mode operation using Doppler backscattering systems

Author

Zhou, C., primary, Liu, A.D., additional, Liu, Z.Y., additional, Wang, M.Y., additional, Xi, F., additional, Zhang, J., additional, Ji, J.X., additional, Fan, H.R., additional, Shi, T.H., additional, Liu, H.Q., additional, Wang, S.X., additional, Zhuang, G., additional, Li, H., additional, Lan, T., additional, Xie, J.L., additional, Mao, W.Z., additional, Ding, W.X., additional, Zou, X.L., additional, and Liu, W.D., additional

Published
2018
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13. Exciting and propagating characteristics of two coexisting kinetic geodesic acoustic modes in the edge of plasma

Author

Kong, D.F., primary, Liu, A.D., additional, Lan, T., additional, Yu, C.X., additional, Cheng, J., additional, Qiu, Z.Y., additional, Zhao, H.L., additional, Shen, H.G., additional, Yan, L.W., additional, Dong, J.Q., additional, Xu, M., additional, Zhao, K.J., additional, Duan, X.R., additional, Liu, Y., additional, Chen, R., additional, Zhang, S.B., additional, Sun, X., additional, Xie, J.L., additional, Li, H., additional, and Liu, W.D., additional

Published
2017
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14. Study of instability driving inward particle flux during the formation of transport barriers at the edge of the HL-2A tokamak

Author

Kong, D.F., primary, Lan, T., additional, Liu, A.D., additional, Yu, C.X., additional, Zhao, H.L., additional, Shen, H.G., additional, Yan, L.W., additional, Dong, J.Q., additional, Xu, M., additional, Zhao, K.J., additional, Cheng, J., additional, Duan, X.R., additional, Liu, Y., additional, Chen, R., additional, Sun, X., additional, Xie, J.L., additional, Li, H., additional, and Liu, W.D., additional

Published
2016
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16. Evolutions of zonal flows and turbulence in a tokamak edge plasma during electron cyclotron resonance heating

Author

Kong, D.F., primary, Liu, A.D., additional, Lan, T., additional, Cui, Z.Y., additional, Yu, D.L., additional, Yan, L.W., additional, Zhao, H.L., additional, Sheng, H.G., additional, Chen, R., additional, Xie, J.L., additional, Li, H., additional, Liu, W.D., additional, Yu, C.X., additional, Ding, W.X., additional, Sun, X., additional, Hong, W.Y., additional, Cheng, J., additional, Zhao, K.J., additional, Dong, J.Q., additional, and Duan, X.R., additional

Published
2013
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17. Observation of nonlinear couplings between coexisting kinetic geodesic acoustic modes in the edge plasmas of the HT-7 tokamak

Author

Kong, D.F., primary, Liu, A.D., additional, Lan, T., additional, Qiu, Z.Y., additional, Zhao, H.L., additional, Sheng, H.G., additional, Yu, C.X., additional, Chen, L., additional, Xu, G.S., additional, Zhang, W., additional, Wan, B.N., additional, Chen, R., additional, Ding, W.X., additional, Sun, X., additional, Xie, J.L., additional, Li, H., additional, and Liu, W.D., additional

Published
2013
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18. Overview of experimental results on HL-2A

Author

Duan, X.R., primary, Ding, X.T., additional, Dong, J.Q., additional, Yang, Q.W., additional, Yan, L.W., additional, Liu, Yi, additional, Zou, X.L., additional, Liu, D.Q., additional, Xuan, W.M., additional, Chen, L.Y., additional, Rao, J., additional, Song, X.M., additional, Mao, W.C., additional, Wang, Q.M., additional, Cao, Z., additional, Li, B., additional, Cao, J.Y., additional, Lei, G.J., additional, Zhang, J.H., additional, Li, X.D., additional, Wang, S.J., additional, Liu, A.D., additional, Bu, M.N., additional, Chen, Y.H., additional, Chen, W., additional, Cheng, J., additional, Cui, C.H., additional, Cui, Z.Y., additional, Deng, Z.C., additional, Dong, Y.B., additional, Feng, B.B., additional, Gao, Q.D., additional, Han, X.Y., additional, Hong, W.Y., additional, Hu, H.T., additional, Huang, M., additional, Huang, Y., additional, Ji, X.Q., additional, Kang, Z.H., additional, Lan, T., additional, Li, G.S., additional, Li, H.J., additional, Li, Qing, additional, Li, Qiang, additional, Li, W., additional, Li, Y.G., additional, Li, Z.J., additional, Liu, Z.T., additional, Luo, C.W., additional, Mao, X.H., additional, Pan, Y.D., additional, Peng, J.F., additional, Shao, K., additional, Song, X.Y., additional, Sun, H.J., additional, Wang, A.K., additional, Wang, H., additional, Wang, M.X., additional, Wang, Y.Q., additional, Wang, Z.T., additional, Xiao, W.W., additional, Xiao, Z.G., additional, Xie, Y.F., additional, Yao, L.H., additional, Yao, L.Y., additional, Yu, D.L., additional, Yuan, B.S., additional, Zhao, K.J., additional, Zheng, Y.Z., additional, Zhong, G.W., additional, Zhou, C.P., additional, Zhou, J., additional, Zhou, Y., additional, Yan, J.C., additional, Yu, C.X., additional, Pan, C.H., additional, and Liu, Yong, additional

Published
2009
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19. Three-dimensional features of GAM zonal flows in the HL-2A tokamak

Author

Yan, L.W., primary, Cheng, J., additional, Hong, W.Y., additional, Zhao, K.J., additional, Lan, T., additional, Dong, J.Q., additional, Liu, A.D., additional, Yu, C.X., additional, Yu, D.L., additional, Qian, J., additional, Huang, Y., additional, Yang, Q.W., additional, Ding, X.T., additional, Liu, Y., additional, and Pan, C.H., additional

Published
2007
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20. Overview of HL-2A experiment results

Author

Yang, Q.W., primary, Liu, Yong, additional, Ding, X.T., additional, Dong, J.Q., additional, Yan, L.W., additional, Liu, D.Q., additional, Xuan, W.M., additional, Chen, L.Y., additional, Rao, J., additional, Duan, X.R., additional, Song, X.M., additional, Cao, Z., additional, Zhang, J.H., additional, Mao, W.C., additional, Zhou, C.P., additional, Li, X.D., additional, Wang, S.J., additional, Bu, M.N., additional, Chen, W., additional, Chen, Y.H., additional, Cui, C.H., additional, Cui, Z.Y., additional, Deng, Z.C., additional, Dong, Y.B., additional, Feng, B.B., additional, Gao, Q.D., additional, Hong, W.Y., additional, Hu, H.T., additional, Huang, Y., additional, Kang, Z.H., additional, Lan, T., additional, Li, B., additional, Li, G.S., additional, Li, H.J., additional, Li, Qiang, additional, Li, Qing, additional, Li, W., additional, Li, Y.G., additional, Li, Z.J., additional, Liu, Yi, additional, Liu, Z.T., additional, Luo, C.W., additional, Mao, X.H., additional, Pan, Y.D., additional, Peng, J.F., additional, Shao, K., additional, Shi, Z.B., additional, Song, X.Y., additional, Wang, A.K., additional, Wang, H., additional, Wang, M.X., additional, Wang, Q.M., additional, Wang, Y.Q., additional, Xiao, W.W., additional, Xiao, Z.G., additional, Xie, Y.F., additional, Yao, L.H., additional, Yao, L.Y., additional, Yu, C.X., additional, Yuan, B.S., additional, Zhao, K.J., additional, Zheng, Y.Z., additional, Zhong, G.W., additional, Zhou, H.Y., additional, Zhou, Y., additional, Yan, J.C., additional, and Pan, C.H., additional

Published
2007
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