Non-linear MHD simulation of ELM energy deposition
Non-linear MHD simulation of ELM energy deposition
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DOI：
10.1088/0029-5515/53/12/123023
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发表时间：
2013-07
期刊：
影响因子：
3.3
通讯作者：
Gta Guido Huijsmans;A. Loarte
中科院分区：
文献类型：
--
作者：
Gta Guido Huijsmans;A. Loarte
利用非线性磁流体动力学（MHD）模拟方法研究了边缘局域模（ELM）能量沉积的机制。ELM的热通量在偏滤器的足迹被发现增加近似线性的总ELM能量损失的射流尺度等离子体，这是类似于实验观察到的扩大ELM能量沉积与ELM能量损失。对于这些相对较大的ELM，其中导电损耗占主导地位，偏滤器足迹加宽是由于气球模式的磁扰动随着ELM能量损耗的增加而增加，这导致与目标相交的同宿缠结加宽。在ITER Q = 10情景中ELM模拟的第一个结果表明，在ITER尺度上，传导和对流ELM的展宽是相似的，至少达到4 MJ的ELM能量损失。对于较大的导电型ELMs的磁扰动和它的同宿缠结确定的ELM热通量的图案在偏滤器目标类似的射流尺度的结果。对于较小的对流ELM，ELM覆盖区由ELM排出的等离子体细丝行进的径向距离和细丝中等离子体能量沿沿着磁场线的损失确定。
The mechanisms of edge-localized mode (ELM) energy deposition are studied by means of non-linear magnetohydrodynamic (MHD) simulation of ELMs. The footprint of the ELM heat flux at the divertor is found to increase approximately linearly with the total ELM energy loss for JET-scale plasmas, which is similar to the experimentally observed broadening of the ELM energy deposition with ELM energy loss. For these relatively large ELMs, in which conductive losses dominate, the divertor footprint broadening is due to an increase in the magnetic perturbation of the ballooning mode with increasing ELM energy loss, which results in a widening of the homoclinic tangles intersecting the target. The first results from ELM simulations in the ITER Q = 10 scenario indicate that on the ITER scale the broadening is similar for conductive and convective ELMs at least up to an ELM energy loss of 4 MJ. For the larger conductive-type ELMs the magnetic perturbation and its homoclinic tangles determine the pattern of the ELM heat flux at the divertor target similar to the JET-scale results. For the smaller convective ELMs, the ELM footprint is determined by the radial distance travelled by plasma filaments expelled by the ELM and the loss of the plasma energy in the filaments along the magnetic field lines.