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A comparison of experimental measurements and code results to determine flows in the JET SOL

机译：比较实验测量结果和代码结果以确定JET SOL中的流量

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Two reciprocating probe systems, at the same poloidal position at the top of the JET torus but toroidally separated by 180degrees, have been used to measure parallel flow in the scrape-off layer (SOL) of lower single-null, diverted plasmas. One system uses the entrance slit plates of a retarding field analyser to record upstream and downstream flux densities, whilst the second employs two pins of a nine-pin turbulent transport probe. Measurements have been made for both forward and reversed toroidal field directions. The results from both probe systems are similar.In the forward field direction, that is with the ion B x del(B) over right arrow drift direction downwards towards the divertor, a strong parallel flow is measured at the top of the machine in the direction from the outer to the inner divertor. The flow generally has a low value, Mach number M similar to 0.2, close to the separatrix, but rises in the region of high magnetic shear close to the separatrix to a maximum of M similar to 0.5 some 20 mm outside the separatrix. In contrast, for a reversed field, the measured flow is small (close to zero) throughout much of the SOL but rises near the separatrix to a value equal in both magnitude and direction to that observed in the forward field. There is thus some symmetry in the flow with respect to field reversal but with a symmetry axis given by a positive offset of around M similar to 0.2. This paper presents simulations using the EDGE2D/Nimbus code, which predicts very low values of parallel flow Mach number near the probe position. The possibility of impurities released from the probe surfaces increasing the flow velocity is explored using the code.
机译：在JET圆环顶部的相同极点位置但环形分开180度的两个往复式探针系统已用于测量下部单零点转向等离子体的刮除层（SOL）中的平行流动。一种系统使用延迟场分析仪的入口狭缝板来记录上游和下游的通量密度，而第二种系统则使用9针湍流传输探针的两个针。已进行了正向和反向环形场方向的测量。两种探针系统的结果都是相似的。在正向磁场方向上，即离子B x del（B）在右箭头上的漂移方向朝着偏滤器向下移动时，在机器顶部测量了强平行流。从外部到内部分流器的方向。流体通常在靠近分离线处具有低值，马赫数M，类似于0.2，但是在分离线附近在靠近分离线的高磁剪切区域中上升到最大M，类似于在分离线外部约20mm的0.5。相反，对于反向场，在大部分SOL中测得的流量很小（接近零），但在分离线附近上升，其大小和方向都等于前向场中观察到的值。因此，相对于场反转，流中存在一些对称性，但是对称轴由大约0.2的M的正偏移给出。本文介绍了使用EDGE2D / Nimbus代码进行的仿真，该代码可预测探头位置附近的并行Mach数非常低。使用代码探讨了从探头表面释放出的杂质会增加流速的可能性。

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