Ion internal transport barrier in neutral beam heated plasmas on HL-2A

D. L. Yu; Y. L. Wei; L. Liu; J. Q. Dong; K. Ida; K. Itoh; A. P. Sun; J. Y. Cao; Z. B. Shi; Z. X. Wang; Y. Xiao; B. S. Yuan; H. R. Du; X. X. He; W. J. Chen; Q. Ma; S. I. Itoh; K. J. Zhao; Y. Zhou; J. Wang; X. Q. Ji; W. L. Zhong; Y. G. Li; J. M. Gao; W. Deng; Yi Liu; Y. Xu; L. W. Yan; Q. W. Yang; X. T. Ding; X. R. Duan; Yong Liu

doi:10.1088/0029-5515/56/5/056003

Ion internal transport barrier in neutral beam heated plasmas on HL-2A

D. L. Yu, Y. L. Wei, L. Liu, J. Q. Dong, K. Ida, K. Itoh, A. P. Sun, J. Y. Cao, Z. B. Shi, Z. X. Wang, Y. Xiao, B. S. Yuan, H. R. Du, X. X. He, W. J. Chen, Q. Ma, S. I. Itoh, K. J. Zhao, Y. Zhou, J. WangX. Q. Ji, W. L. Zhong, Y. G. Li, J. M. Gao, W. Deng, Yi Liu, Y. Xu, L. W. Yan, Q. W. Yang, X. T. Ding, X. R. Duan, Yong Liu

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

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Abstract

Ion internal transport barriers (iITBs) are first observed in neutral beam injection (NBI) heated plasmas at the HL-2A tokamak. The position of the barrier foot, in the stationary state, coincides with the q = 1 surface within its uncertainty of measurement. iITBs can develop more easily at the beginning of NBI heating. Also, iITBs are unstable for the sawtooth plasma. Simulations reveal that the thermal diffusivity of ions (χ _i) inside the barrier can be as low as the neoclassical level. It is observed that the flow shear in the stationary iITB state reaches the level required for suppressing the ion temperature gradient mode instability, which indicates the important role of flow shear in sustaining the iITB.

Original language	English
Article number	056003
Journal	Nuclear Fusion
Volume	56
Issue number	5
DOIs	https://doi.org/10.1088/0029-5515/56/5/056003
Publication status	Published - Mar 31 2016

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Yu, D. L., Wei, Y. L., Liu, L., Dong, J. Q., Ida, K., Itoh, K., Sun, A. P., Cao, J. Y., Shi, Z. B., Wang, Z. X., Xiao, Y., Yuan, B. S., Du, H. R., He, X. X., Chen, W. J., Ma, Q., Itoh, S. I., Zhao, K. J., Zhou, Y., ... Liu, Y. (2016). Ion internal transport barrier in neutral beam heated plasmas on HL-2A. Nuclear Fusion, 56(5), [056003]. https://doi.org/10.1088/0029-5515/56/5/056003

Ion internal transport barrier in neutral beam heated plasmas on HL-2A. / Yu, D. L.; Wei, Y. L.; Liu, L.; Dong, J. Q.; Ida, K.; Itoh, K.; Sun, A. P.; Cao, J. Y.; Shi, Z. B.; Wang, Z. X.; Xiao, Y.; Yuan, B. S.; Du, H. R.; He, X. X.; Chen, W. J.; Ma, Q.; Itoh, S. I.; Zhao, K. J.; Zhou, Y.; Wang, J.; Ji, X. Q.; Zhong, W. L.; Li, Y. G.; Gao, J. M.; Deng, W.; Liu, Yi; Xu, Y.; Yan, L. W.; Yang, Q. W.; Ding, X. T.; Duan, X. R.; Liu, Yong.

In: Nuclear Fusion, Vol. 56, No. 5, 056003, 31.03.2016.

Research output: Contribution to journal › Article › peer-review

Yu, DL, Wei, YL, Liu, L, Dong, JQ, Ida, K, Itoh, K, Sun, AP, Cao, JY, Shi, ZB, Wang, ZX, Xiao, Y, Yuan, BS, Du, HR, He, XX, Chen, WJ, Ma, Q, Itoh, SI, Zhao, KJ, Zhou, Y, Wang, J, Ji, XQ, Zhong, WL, Li, YG, Gao, JM, Deng, W, Liu, Y, Xu, Y, Yan, LW, Yang, QW, Ding, XT, Duan, XR & Liu, Y 2016, 'Ion internal transport barrier in neutral beam heated plasmas on HL-2A', Nuclear Fusion, vol. 56, no. 5, 056003. https://doi.org/10.1088/0029-5515/56/5/056003

Yu, D. L. ; Wei, Y. L. ; Liu, L. ; Dong, J. Q. ; Ida, K. ; Itoh, K. ; Sun, A. P. ; Cao, J. Y. ; Shi, Z. B. ; Wang, Z. X. ; Xiao, Y. ; Yuan, B. S. ; Du, H. R. ; He, X. X. ; Chen, W. J. ; Ma, Q. ; Itoh, S. I. ; Zhao, K. J. ; Zhou, Y. ; Wang, J. ; Ji, X. Q. ; Zhong, W. L. ; Li, Y. G. ; Gao, J. M. ; Deng, W. ; Liu, Yi ; Xu, Y. ; Yan, L. W. ; Yang, Q. W. ; Ding, X. T. ; Duan, X. R. ; Liu, Yong. / Ion internal transport barrier in neutral beam heated plasmas on HL-2A. In: Nuclear Fusion. 2016 ; Vol. 56, No. 5.

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title = "Ion internal transport barrier in neutral beam heated plasmas on HL-2A",

abstract = "Ion internal transport barriers (iITBs) are first observed in neutral beam injection (NBI) heated plasmas at the HL-2A tokamak. The position of the barrier foot, in the stationary state, coincides with the q = 1 surface within its uncertainty of measurement. iITBs can develop more easily at the beginning of NBI heating. Also, iITBs are unstable for the sawtooth plasma. Simulations reveal that the thermal diffusivity of ions (χ i) inside the barrier can be as low as the neoclassical level. It is observed that the flow shear in the stationary iITB state reaches the level required for suppressing the ion temperature gradient mode instability, which indicates the important role of flow shear in sustaining the iITB.",

author = "Yu, {D. L.} and Wei, {Y. L.} and L. Liu and Dong, {J. Q.} and K. Ida and K. Itoh and Sun, {A. P.} and Cao, {J. Y.} and Shi, {Z. B.} and Wang, {Z. X.} and Y. Xiao and Yuan, {B. S.} and Du, {H. R.} and He, {X. X.} and Chen, {W. J.} and Q. Ma and Itoh, {S. I.} and Zhao, {K. J.} and Y. Zhou and J. Wang and Ji, {X. Q.} and Zhong, {W. L.} and Li, {Y. G.} and Gao, {J. M.} and W. Deng and Yi Liu and Y. Xu and Yan, {L. W.} and Yang, {Q. W.} and Ding, {X. T.} and Duan, {X. R.} and Yong Liu",

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doi = "10.1088/0029-5515/56/5/056003",

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T1 - Ion internal transport barrier in neutral beam heated plasmas on HL-2A

AU - Yu, D. L.

AU - Wei, Y. L.

AU - Liu, L.

AU - Dong, J. Q.

AU - Ida, K.

AU - Itoh, K.

AU - Sun, A. P.

AU - Cao, J. Y.

AU - Shi, Z. B.

AU - Wang, Z. X.

AU - Xiao, Y.

AU - Yuan, B. S.

AU - Du, H. R.

AU - He, X. X.

AU - Chen, W. J.

AU - Ma, Q.

AU - Itoh, S. I.

AU - Zhao, K. J.

AU - Zhou, Y.

AU - Wang, J.

AU - Ji, X. Q.

AU - Zhong, W. L.

AU - Li, Y. G.

AU - Gao, J. M.

AU - Deng, W.

AU - Liu, Yi

AU - Xu, Y.

AU - Yan, L. W.

AU - Yang, Q. W.

AU - Ding, X. T.

AU - Duan, X. R.

AU - Liu, Yong

PY - 2016/3/31

Y1 - 2016/3/31

N2 - Ion internal transport barriers (iITBs) are first observed in neutral beam injection (NBI) heated plasmas at the HL-2A tokamak. The position of the barrier foot, in the stationary state, coincides with the q = 1 surface within its uncertainty of measurement. iITBs can develop more easily at the beginning of NBI heating. Also, iITBs are unstable for the sawtooth plasma. Simulations reveal that the thermal diffusivity of ions (χ i) inside the barrier can be as low as the neoclassical level. It is observed that the flow shear in the stationary iITB state reaches the level required for suppressing the ion temperature gradient mode instability, which indicates the important role of flow shear in sustaining the iITB.

AB - Ion internal transport barriers (iITBs) are first observed in neutral beam injection (NBI) heated plasmas at the HL-2A tokamak. The position of the barrier foot, in the stationary state, coincides with the q = 1 surface within its uncertainty of measurement. iITBs can develop more easily at the beginning of NBI heating. Also, iITBs are unstable for the sawtooth plasma. Simulations reveal that the thermal diffusivity of ions (χ i) inside the barrier can be as low as the neoclassical level. It is observed that the flow shear in the stationary iITB state reaches the level required for suppressing the ion temperature gradient mode instability, which indicates the important role of flow shear in sustaining the iITB.

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JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

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Ion internal transport barrier in neutral beam heated plasmas on HL-2A

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