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Scrape-off layer power fall-off length from turbulence simulations of ASDEX Upgrade L-mode

机译:ASDEX升级L-Mode的湍流模拟刮削层功率掉落长度

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The scrape-off layer (SOL) power fall-off length, lambda(q), for parameters relevant to ASDEX Upgrade (AUG) L-mode discharges is examined by means of numerical simulations. The simulation data is acquired using synthetic probe data from turbulence simulations, which gives a high temporal resolution on the full density and pressure fields, required for an accurate evaluation of lambda(q) due to the strongly intermittent signals in the SOL. Electron conduction is found to dominate the parallel heat flux close to the separatrix, while ion convection dominates in the far SOL. Good agreement is found with the experimental scaling for AUG L-mode Sieglin et al (2016 Plasma Phys. Control. Fusion 58 055015), where lambda(q) is found to scale almost linearly with the safety factor, q, and to be weakly dependent on the power across the last-closed flux surface (LCFS), P. However, P depends on a wide range of parameters. In this paper we trace this dependence and the resulting fit of lambda(q) reveals a scaling proportional to the inverse square root of the electron temperature at the LCFS, Te,LCFS-1/2 ,and a linear dependence on q.
机译:通过数值模拟检查涵盖层(SOL)电源掉落长度,Lambda(Q),用于与ASDEX升级(AUG)L模式放电的参数。使用来自湍流模拟的合成探头数据获取模拟数据,这在完全密度和压力场上给出了高度的时间分辨率,所以由于溶胶中的强烈间歇的信号而准确评估Lambda(Q)。发现电子传导使得靠近分离器的平行热通量主导,而离子对流在远离溶胶中占主导地位。良好的一致性是在8月L-Mode Sieglin等人(2016等离子体物理学)的实验缩放。控制。发现Lambda(Q)与安全因子,Q,Q,Q,Q,Q,Q.,Qually and antglin等。依赖于上一闭合磁通表面(LCFS),P的电力,P然而,P取决于各种参数。在本文中,我们追踪该依赖性,并且产生的λ(Q)的所得拟合揭示了与LCFS,TE,LCFS-1/2的电子温度的逆平面根成比例的缩放和对Q的线性依赖性。

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