Impact of rotating resonant magnetic perturbation fields on plasma edge electron density and temperature
Impact of rotating resonant magnetic perturbation fields on plasma edge electron density and temperature
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DOI：
10.1088/0029-5515/52/8/083002
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发表时间：
2012-08
期刊：
影响因子：
3.3
通讯作者：
H. Stoschus;O. Schmitz;H. Frerichs;D. Reiser;M. Jakubowski;B. Unterberg;M. Lehnen;D. Reiter;U. Samm
中科院分区：
文献类型：
--
作者：
H. Stoschus;O. Schmitz;H. Frerichs;D. Reiser;M. Jakubowski;B. Unterberg;M. Lehnen;D. Reiter;U. Samm
旋转共振磁微扰（RMP）场对边缘电子密度ne（r，t）场和温度Te（r，t）场产生特征调制，这种调制依赖于外RMP场与等离子体流体之间的相对旋转frel。在TEXTOR L模等离子体边缘（r/a = 0.9-1.05）测量的ne（r，t）和Te（r，t）场与低相对旋转frel = −0.2 kHz的局部磁真空拓扑密切相关。与三维中性和等离子体输运程序EMC 3-Eirene相比，这提供了大量的实验证据，表明对于低相对旋转水平和高共振场振幅（归一化径向场强度），存在由扩散输运主导的具有残余岛链的随机边缘。在螺旋形刮除层的径向外侧，发现存在嵌入随机域的所谓层流区。相比之下，对于frel = 1.8kHz的高相对旋转，ne的测量调制相对于建模的真空拓扑环形地偏移π/2。在共振通量表面处测量到Te（r）的显著平坦化和ne（r）的减小，并且表示磁岛的明显特征，其相对于真空岛位置相移。的层流区径向向外的非常等离子体边缘的相关位移观察表明，在扰动源的实际近场结构是由等离子体响应以及确定。
Rotating resonant magnetic perturbation (RMP) fields impose a characteristic modulation to the edge electron density ne(r, t) and temperature Te(r, t) fields, which depends on the relative rotation frel between external RMP field and plasma fluid. The ne(r, t) and Te(r, t) fields measured in the edge (r/a = 0.9–1.05) of TEXTOR L-mode plasmas are in close correlation with the local magnetic vacuum topology for low relative rotation frel = −0.2 kHz. In comparison with the 3D neutral and plasma transport code EMC3-Eirene, this provides substantial experimental evidence that for low relative rotation level and high resonant field amplitudes (normalized radial field strength ), a stochastic edge with a remnant island chain dominated by diffusive transport exists. Radially outside a helical scrape-off layer, the so-called laminar zone embedded into a stochastic domain is found to exist. In contrast for high relative rotation of frel = 1.8 kHz, the measured modulation of ne is shifted by π/2 toroidally with respect to the modelled vacuum topology. A pronounced flattening in Te(r) and a reduction in ne(r) is measured at the resonant flux surface and represents a clear signature for a magnetic island, which is phase shifted with respect to the vacuum island position. A correlated shift of the laminar zone radially outwards at the very plasma edge is observed suggesting that the actual near-field structure at the perturbation source is determined by the plasma response as well.