Role of energetic particles in heat and particle exhaust in a poloidal divertor RFP
Role of energetic particles in heat and particle exhaust in a poloidal divertor RFP
复制标题
极向偏滤器 RFP 中高能粒子在热量和粒子排放中的作用
DOI：
10.1016/s0022-3115(97)80182-1
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
H. Oshiyama
中科院分区：
文献类型：
--
作者：
S. Masamune;M. Iida;N. Oda;M. Awazu;K. Fujitsuka;K. Ohta;H. Oshiyama
在STE-2反场箍缩(RFP)中的闭合极向偏滤器实验中，证明了热量和粒子排入RFP偏滤器区域。然而，从偏滤器喉部附近的平衡流量表面几何形状来看，排气效率低于预期。此外，还观察到了增强等离子体-壁相互作用(PWI)的迹象。在极向偏滤器结构下进行的粒子轨道计算表明，复杂的轨道强烈地依赖于粒子能量、俯仰角和初始位置。结果表明，RFP中常见的边缘超热电子或反常加热离子等高能粒子，由于大拉莫半径的影响，可能会增加偏滤器喉部附近的PWI，并降低排气效率。结果还表明，轨道对分离线附近的初始位置非常敏感，这表明边缘磁涨落对偏滤器作用的重要性。文中还讨论了RFP偏滤器未来研究的问题。
In a closed poloidal divertor experiment in the STE-2 reversed field pinch (RFP), heat and particle exhaust into the RFP divertor region has been demonstrated. The exhaust efficiency, however, was lower than expected from equilibrium flux surface geometry near the divertor throat. In addition, indications of enhanced plasma-wall interaction (PWI) have also been observed. Particle orbit calculations have been carried out in the poloidal divertor configuration, showing that the complicated orbits depend strongly upon the particle energy, pitch angle and initial position. It has been concluded that energetic particles such as edge superthermal electrons or anomalously heated ions, both of which are common to the RFP, possibly enhance PWI near the divertor throat due to the effect of large Larmor radii, and reduce the exhaust efficiency also. It has also been shown that the orbits are quite sensitive to the initial positions near the separatrix, indicating the importance of edge magnetic fluctuations to the divertor action. Issues for future RFP divertor studies are also discussed.