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Effect of collisional temperature isotropisation on ELM parallel transport in a tokamak scrape-off layer

机译:碰撞温度各向同性对托卡马克刮除层中ELM平行传输的影响

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We develop a hybrid model to describe the parallel transport in a tokamak scrape-off layer following an edge-localized mode (ELM) event. The parallel dynamics is treated with a kinetic Vlasov-Poisson model, while the evolution of the perpendicular temperature T-perpendicular to is governed by a fluid equation. The coupling is ensured by isotropising collisions. The model generalises an earlier approach where T-perpendicular to was constant in space and time (Manfredi et al 2011 Plasma Phys. Control. Fusion 53 015012). Numerical results show that the main effect comes from electron-electron collisions, which limit the decrease of the parallel electron temperature and increase the potential drop in the Debye sheath in front of the surface. Ion-ion collisions have an almost negligible impact. The net effect is an increased peak power load on the target plates.
机译:我们开发了一个混合模型来描述边缘定位模式(ELM)事件后在托卡马克刮除层中的并行传输。并行动力学用动力学Vlasov-Poisson模型处理,而垂直温度T垂直于的演化则由流体方程控制。各向同性的碰撞确保了耦合。该模型概括了一种较早的方法,其中T垂直于时空是恒定的(Manfredi等,2011 Plasma Phys。Control。Fusion 53 015012)。数值结果表明,主要影响来自电子-电子碰撞,这限制了平行电子温度的降低,并增加了表面前方德拜鞘中的电势降。离子碰撞的影响几乎可以忽略不计。最终效果是增加了目标板上的峰值功率负载。

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