等离子体形变对边界局域模的作用研究  

The study of plasma shaping effect on edge localized mode

作　　者：秦晨晨 牟茂淋 陈少永[1] 唐昌建[1] 吴娜 QIN Chen-chen;MOU Mao-lin;CHEN Shao-yong;TANG Chang-jian;WU Na(College of Physical Science and Technology,Sichuan University,Chengdu 610065;Southwestern Institute of Physics,Chengdu 610041)

机构地区：[1]四川大学物理学院,成都610065 [2]核工业西南物理研究院,成都610041

出　　处：《核聚变与等离子体物理》2020年第3期215-221,共7页Nuclear Fusion and Plasma Physics

基　　金：国家自然科学基金(11775154);国家磁约束核聚变能发展研究专项(2017YFE0301203)。

摘　　要：在磁流体模拟代码BOUT++剥离气球模三场模块框架下研究了等离子体形变参数(拉长比和三角形变)对边界局域模的影响。研究表明,在线性阶段,拉长比主要作用于剥离气球模中气球模成分,抑制了环向模数较高的气球模不稳定性;而三角形变则对剥离气球模中剥离模成分和气球模成分均有抑制作用。在非线性阶段,拉长比导致边界E×B剪切率增加,迫使压强扰动的正值部分向等离子体芯部发展,导致边界局域模的能量损失增加;三角形变则导致边界E×B剪切率降低,使得压强扰动可以向等离子体边缘发展,台基向等离子体芯部的崩塌减弱,从而对边界局域模起到缓解作用。Influence of shaped plasma parameters(elongation and triangularity)on edge localized mode is simulated with the peeling-ballooning three-field module of BOUT++code.In the linear simulation,the elongation has mainly effect on the ballooning component of the peeling-ballooning mode and suppresses its growth,while the triangularity has effect on both ballooning component and peeling component of the peeling-ballooning mode.In the nonlinear simulation,the elongation leads to larger ELMs energy loss because of the increased boundary E×B shear rate which forces the positive pressure perturbation to extend to the plasma core,while the triangularity plays an opposite role.

关 键 词：边界局域模 剥离气球模 拉长比 三角形变 

分 类 号：O5342[理学—等离子体物理]