聚变装置中未磁化分流器等离子体的等离子体动力学和碰撞磁性鞘前结构

I. Baranovsky, E. Kaveeva, V. Rozhansky
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摘要

本文提出了一个在略微倾斜的磁场中离子强电离等离子体动力学模型,该模型在离子-离子碰撞方面未被磁化,是典型的分离状态。结果表明,在远离材料表面的地方,平行动力学几乎与磁化等离子体相同。在材料壁附近,平行等离子体运动转变为电子-离子碰撞产生的垂直经典扩散,形成扩散层。尽管离子在到达表面之前会发生多次碰撞,但在距离材料表面几个离子回旋数的距离处,会形成碰撞磁预鞘,离子以声速数量级的速度向表面移动。在典型的几度磁场倾斜角情况下,扩散层和鞘内的静电势与电子的波尔兹曼势有很大偏差,这是无碰撞磁性鞘的典型特征。此外,某些区域的法向电场远离表面,这对杂质与表面的相互作用非常重要。
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Plasma dynamics and collisional magnetic presheath structure in unmagnetized divertor plasma in fusion devices
A model of strongly ionized plasma dynamics in a slightly inclined magnetic field with ions, unmagnetized with respect to ion–ion collisions, typical for detached regimes, is presented. It is demonstrated that far from the material surface, the parallel dynamics remains almost the same as in the magnetized plasma. In the wall vicinity, parallel plasma motion is transformed into perpendicular classical diffusion originating from electron–ion collisions, forming a diffusive layer. At a distance of few ion gyroradii from the material surface, a collisional magnetic presheath is formed, where ions move toward the surface with the velocity of the order of the sound speed, in spite of the fact that an ion exhibits many collisions before reaching the surface. For typical inclination angles of magnetic field of the order of few degrees, the electrostatic potential in the diffusive layer and in the presheath deviates considerably from the Boltzmann potential for electrons, which is typical for collisionless magnetic presheath. Moreover, the normal electric field in some regions is directed away from the surface, which is important for impurities to interact with the surface.
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