Investigation of impurity confinement in lower hybrid wave heated plasma on EAST tokamak-猫眼课题宝

DOI：

10.1088/1741-4326/aa8e06

发表时间：

2017

期刊：

Nuclear Fusion

影响因子：

3.3

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

Z. Xu;Z. Wu;L. Zhang;W. Gao;Y. Ye;K. Chen;Y. Yuan;W. Zhang;X.D. Yang;Y.J. Chen;P.F. Zhang;J. Huang;C.R. Wu;S. Morita;T. Oishi;J.Z. Zhang;Y. Duan;Q. Zang;S. Ding;H.Q. Liu;J.L. Chen;L. Hu;G.S. Xu;H. Guo

利用瞬态微扰法研究了低杂波（LHW）加热EAST无锯齿等离子体中杂质的约束特性，其中引入了金属杂质Fe（Z = 26）和Cu（Z = 29）.研究了欧姆加热和低杂波加热等离子体中金属杂质约束时间与等离子体参数（如等离子体电流、环形磁场、电子密度和加热功率）的关系。结果表明，低杂波加热对缩短EAST L模放电中的杂质约束时间起着重要作用。EAST上的杂质限制时间标度为42IP0.32Bt0.2n <$e0.43Ptotal − 0.4，与Tore Supra和JET上观察到的标度接近。此外，LHW加热的高增强再循环（HER）H模放电与~25 kHz的边缘相干模式（ECM），具有较低的杂质限制时间和较高的能量限制时间，提供了有前途的候选人的高性能和稳态运行的EAST。

The transient perturbation method with metallic impurities such as iron (Fe, Z = 26) and copper (Cu, Z = 29) induced in plasma-material interaction (PMI) procedure is used to investigate the impurity confinement characters in lower hybrid wave (LHW) heated EAST sawtooth-free plasma. The dependence of metallic impurities confinement time on plasma parameters (e.g. plasma current, toroidal magnetic field, electron density and heating power) are investigated in ohmic and LHW heated plasma. It is shown that LHW heating plays an important role in the reduction of the impurity confinement time in L-mode discharges on EAST. The impurity confinement time scaling is given as 42IP0.32Bt0.2n¯e0.43Ptotal−0.4 on EAST, which is close to the observed scaling on Tore Supra and JET. Furthermore, the LHW heated high-enhanced-recycling (HER) H-mode discharges with ~25 kHz edge coherent modes (ECM), which have lower impurity confinement time and higher energy confinement time, provide promising candidates for high performance and steady state operation on EAST.

Investigation of impurity confinement in lower hybrid wave heated plasma on EAST tokamak

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