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 | |
| Publication status | Published - Mar 31 2016 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Condensed Matter Physics
Cite this
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
}
TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=84964573537&partnerID=8YFLogxK
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U2 - 10.1088/0029-5515/56/5/056003
DO - 10.1088/0029-5515/56/5/056003
M3 - Article
AN - SCOPUS:84964573537
VL - 56
JO - Nuclear Fusion
JF - Nuclear Fusion
SN - 0029-5515
IS - 5
M1 - 056003
ER -