ExploringSF-in-outasymmetryanddetachmentbifurcationinHL-2Mwith E×BbySOLPS
ExploringSF-in-outasymmetryanddetachmentbifurcationinHL-2Mwith E×BbySOLPS
复制标题
使用 EäBbySOLPS 探索 HL-2M 中的 SF-in-out 不对称性和分离分叉
DOI：
10.1016/j.nme.2019.100719
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
ZhengGuoyao
中科院分区：
文献类型：
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作者：
Du Hai long;ZhengGuoyao
本文利用边缘等离子体数值模拟软件SOLPS5.1研究了HL-2 M装置中SF-（第二个X点位于靶外表面附近）的内外不对称性和脱附分叉现象，其中考虑了电场的影响，但忽略了磁场的影响。模拟结果表明，由于有效碳屏蔽容量和高散热性，径向电漂移分量（Epol× B）在诱导SF-进出不对称性方面起着关键作用。Epol × Bdrift能增强极向电漂移分量（Er× B），它们的协同作用能引起明显的输入输出不对称性。此外，研究结果还表明，在一定条件下，SF-也可能发生脱附分岔。四个因素（E × B、C杂质、正态-Bt和相对较小的径向反常输运系数）的存在构成了产生脱离分岔的必要条件。分离分叉形成的根本原因是外偏滤器区Te、E×B和C杂质辐射损失的强相互作用所致。分离分叉可通过减弱其相互作用来移除或缓解。最后，模拟了含时脱附分岔过程，以更好地理解其物理图像。
In this paper, the SF- (with the second X-point located near the outer target surface) in-out asymmetry and detachment bifurcation in HL-2M were explored by the edge plasma code SOLPS5.1 including electric but neglecting magnetic drifts. The modeling results reveal that the radial electric drift component (Epol× B) can play a key role on inducing the SF- in-out asymmetry due to the effective carbon (C) screen capacity and high heat dissipation. TheEpol× Bdrift can enhance the poloidal electric drift component (Er× B), and their synergistic effects can induce a marked in-out asymmetry. Besides, the results showed that the detachment bifurcation in SF- also could occur under given conditions. The presence of four factors (includingE × B, Cimpurity, normal-Bt, and relatively small radial anomalous transport coefficients) forms the necessary conditions for producing the detachment bifurcation. The root reason for the detachment bifurcation formation is due to the strong interaction ofTe, E×B,and C impurity radiation loss in the outer divertor region with normal-Btdirection. The detachment bifurcation could be removed or mitigated by weakening their interaction. Finally, the time-dependent detachment bifurcation process is simulated in this work to better understand its physical picture.