Poloidal asymmetry in the narrow heat flux feature in the TCV scrape-off layer
Poloidal asymmetry in the narrow heat flux feature in the TCV scrape-off layer
复制标题
TCV 刮除层窄热通量特征中的极向不对称性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
E. Team
中科院分区：
文献类型：
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作者：
C. Tsui;J. Boedo;F. Halpern;J. Loizu;F. Nespoli;J. Horáček;B. Labit;J. Morales;H. Reimerdes;P. Ricci;C. Theiler;S. Coda;B. Duval;I. Furno;Tcv Team;E. Team
在TCV托卡马克内壁受限放电过程中，由TCV托卡马克外中板的往复探头推断出的热流分布特征是径向衰减长度在最后一个封闭通量面（LCFS）附近缩短，与所谓的窄特征一致。与红外热像仪在内壁测得的窄特征相比，外侧窄特征明显变宽，因此很难从主要刮擦层特征中识别出来。在应用小位移进行对准后，窄特征中包含的功率分数在板内和板外测量之间匹配，并且它们与等离子体电流Ip一起缩放，表明我们观察到相同的现象。如果窄特征是由径向剪切的E × B流引起的，则发现窄特征内的舷外侧脱落长度与边缘湍流的径向相关长度成正比。即使在窄特征为……的情况下，这也是成立的。
Heat flux profiles inferred from a reciprocating probe at the outer midplane of the TCV tokamak during inner wall limited discharges feature radial fall-off lengths that shorten near the last closed flux surface (LCFS) consistent with the so-called narrow feature. The narrow feature is significantly wider on the outboard side compared with that measured on the inner wall by infrared thermography, so it is difficult to discern from the main scrape-off layer feature. After small shifts were applied for alignment, the fraction of the power contained in the narrow feature matches between inboard and outboard measurements, and they scale together with plasma current Ip, suggesting that we are observing the same phenomenon. The outboard side fall-off length within the narrow feature is found to scale closely with the radial correlation length of the edge turbulence as expected if the narrow feature arises due to radially sheared E × B flows. This is found to hold true even for cases where the narrow feature is ...