Studies of high confinement plasma with lower hybrid current drive in the HT-7 superconducting tokamak
Studies of high confinement plasma with lower hybrid current drive in the HT-7 superconducting tokamak
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DOI：
10.1088/0029-5515/43/7/308
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发表时间：
2003-06
期刊：
影响因子：
3.3
通讯作者：
B. Ding;G. Kuang;J. Shan;Guosheng Xu;B. Wan;Jian-gang Li;Ht Team
中科院分区：
文献类型：
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作者：
B. Ding;G. Kuang;J. Shan;Guosheng Xu;B. Wan;Jian-gang Li;Ht Team
在HT-7超导托卡马克装置上用低杂波电流驱动（LHCD）产生了高约束等离子体（包括芯部等离子体和边缘等离子体）。在核心等离子体中形成了内部传输势垒。能量约束时间从14.6 ms（欧姆（OH）相）增加到24.5 ms（LHCD相），这接近于使用ITER 93 ELM自由标度定律计算的值。限制因子H89从0.78（OH相）增加到1.42（LHCD相）。实验结果与光线追迹程序和二维Fokker-Planck方程的模拟结果吻合较好。利用朗缪尔探针研究了最后一个封闭通量面附近的边缘等离子体特性。低杂波对边缘等离子体的湍流和输运有很大的抑制作用。研究表明，增强约束等离子体可能是由于径向电场剪切产生的剪切流。
A high confinement plasma (including core plasma and edge plasma) produced by using lower hybrid current drive (LHCD) has been obtained on the HT-7 superconducting tokamak. An internal transport barrier in the core plasma was formed. The energy confinement time increases from 14.6 ms (Ohmic (OH) phase) to 24.5 ms (LHCD phase), which is close to the value calculated using the ITER93ELM free scaling law. The confinement factor H89 increases from 0.78 (OH phase) to 1.42 (LHCD phase). The experimental results were in good agreement with the simulations calculated with a ray tracing code and a two-dimensional Fokker–Planck equation. The edge plasma characteristics around the last closed flux surface were investigated using Langmuir probes. Turbulence and transport of the edge plasma were suppressed greatly by the lower hybrid wave. Studies show that the enhanced confinement plasma may be ascribed to a shear flow resulting from the shear of the radial electric field.