Effects of neutral particles on edge dynamics in Alcator C-Mod plasmas.
Effects of neutral particles on edge dynamics in Alcator C-Mod plasmas.
复制标题
中性粒子对 Alcator C-Mod 等离子体边缘动力学的影响。
DOI：
10.1063/1.874016
复制
发表时间：
2000
影响因子：
2.2
通讯作者：
L. Owen
中科院分区：
文献类型：
--
作者：
R. Boivin;J. Goetz;A. Hubbard;J. Hughes;I. Hutchinson;J. Irby;B. LaBombard;E. Marmar;D. Mossessian;C. Pitcher;J. Terry;B. Carreras;L. Owen
中性粒子密度和能量损失已经在Alcator C-Mod托卡马克中测量到[Hutchinson等，Phys.等离子体1,1511(1994)]。讨论了它们对伴随增强禁闭机制的边缘势垒的形成和演化的影响。中性子可以通过粒子、动量和能量平衡进入边缘动力学。在边缘势垒区测得的中性密度高达5×10~(16) m−~3。中性粒子进入了大多数外围的局部动力学，而不仅仅是在X点处。在分离线附近的区域获得了高分辨率的电离分布测量。当等离子体从低模约束(H模)过渡到高模约束(H模)时，轮廓在分离线内移动，这部分解释了边缘密度的急剧上升。测量的中性密度足够大，足以通过电荷交换影响体离子动量，从而在边缘引入负径向电场。同时，..。
Neutral particle densities and energy losses have been measured in the Alcator C-Mod tokamak [Hutchinson et al., Phys. Plasmas 1, 1511 (1994)]. Their effect on the formation and evolution of the edge barrier which accompanies the enhanced confinement regime are discussed. The neutrals can enter the edge dynamics through the particle, momentum, and energy balance. Neutral densities of up to 5×1016 m−3 have been measured in the edge barrier region. Neutrals enter the local dynamics around most of the periphery, not just at the X-point. High resolution measurements of the ionization profile have been obtained for the region near the separatrix. The profile shifts inside the separatrix as the plasma is making a transition from low-to high-mode confinement (H-mode) regimes, partly accounting for the dramatic rise in edge density. The measured neutral density is large enough to affect the bulk ion momentum by charge exchange, and thereby introduces a negative radial electric field at the edge. At the same time,...