Effect of Wave Accessibility on Lower Hybrid Wave Current Drive in Experimental Advanced Superconductor Tokamak with H-Mode Operation
Effect of Wave Accessibility on Lower Hybrid Wave Current Drive in Experimental Advanced Superconductor Tokamak with H-Mode Operation
复制标题
波可达性对 H 模式实验先进超导托卡马克中较低混合波电流驱动的影响
DOI：
10.1088/0256-307x/32/3/035202
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发表时间：
2015-02
期刊：
影响因子：
--
通讯作者：
甘春芸
中科院分区：
文献类型：
--
作者：
李新霞;项农;甘春芸
研究了波可达性条件对实验先进超导托卡马克（EAST）H模运行等离子体低杂波电流驱动的影响。基于一个简化的模型，证明了在典型EAST H模参数下，在等离子体外围存在快波分支和慢波分支之间的低混杂波的模式转换层。在低杂波模拟程序LSC的框架下，数值计算了波射线轨迹和相应的电流驱动。结果表明，波可达性条件对EAST等离子体的低杂波电流驱动起着重要作用。对于折射率为n的平行光线||= 2.1或n|| = 2.5时，由于环形几何效应，波射线可以穿透核心等离子体，而在等离子体外围发生波射线轨迹的多次反射。然而，获得低电流驱动效率。同时，如果施加更高的约束磁场，波的可达性条件得到改善。模拟结果表明，对于当前EAST H模运行的等离子体参数，对于峰值为n的波谱，可以获得明显较低的杂波电流驱动||= 2.1，如果施加环形磁场BT = 2.5 T。
The effect of the wave accessibility condition on the lower hybrid current drive in the experimental advanced superconductor Tokamak (EAST) plasma with H-mode operation is studied. Based on a simplified model, a mode conversion layer of the lower hybrid wave between the fast wave branch and the slow wave branch is proved to exist in the plasma periphery for typical EAST H-mode parameters. Under the framework of the lower hybrid wave simulation code (LSC), the wave ray trajectory and the associated current drive are calculated numerically. The results show that the wave accessibility condition plays an important role on the lower hybrid current drive in EAST plasma. For wave rays with parallel refractive index n|| = 2.1 or n|| = 2.5 launched from the outside midplane, the wave rays may penetrate the core plasma due to the toroidal geometry effect, while numerous reflections of the wave ray trajectories in the plasma periphery occur. However, low current drive efficiency is obtained. Meanwhile, the wave accessibility condition is improved if a higher confined magnetic field is applied. The simulation results show that for plasma parameters under present EAST H-mode operation, a significant lower hybrid wave current drive could be obtained for the wave spectrum with peak value n|| = 2.1 if a toroidal magnetic field BT = 2.5 T is applied.
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