Cross-field motion of plasma blob-filaments and related particle flux in an open magnetic field line configuration on QUEST
Cross-field motion of plasma blob-filaments and related particle flux in an open magnetic field line configuration on QUEST
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DOI：
10.1016/j.jnucmat.2013.01.106
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发表时间：
2013-07
影响因子：
3.1
通讯作者：
H. Liu;K. Hanada;N. Nishino;R. Ogata;M. Ishiguro;Xiang Gao;H. Zushi;K. Nakamura;A. Fujisawa;H. Idei;M. Hasegawa
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文献类型：
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作者：
H. Liu;K. Hanada;N. Nishino;R. Ogata;M. Ishiguro;Xiang Gao;H. Zushi;K. Nakamura;A. Fujisawa;H. Idei;M. Hasegawa
用快速照相机和可移动朗缪尔探针在开放的电子回旋共振（ECR）加热等离子体的磁场线位形中观测到了斑点-细丝。沿沿着场线延伸的斑点细丝确实对应于过密等离子体结构，并且穿过场线传播到外壁。通过三种方法得到了液滴结构的径向速度VB，其径向速度主要由E×B力驱动。计算结果表明，径向速度、液滴尺寸等参数与套管连通式立交理论模型计算结果吻合较好。Vb对应于QUEST中的局部声速（Cs）的大约0.02-0.07。研究了表征密度涨落概率密度函数形状的高阶矩（偏度S和峰度K）。用二次多项式进行最小二乘拟合得到K=（1.60±0.27）S2−（0.46±0.20）。较大的斑点结构，只发生10%的时间，可以携带超过60%的损失的整个径向粒子通量。
Blob-filaments have been observed by combined measurement with a fast camera and a movable Langmuir probe in an open magnetic field line configuration of electron cyclotron resonance (ECR) heating plasma in QUEST. Blob-filaments extended along field lines do correspond to over-dense plasma structures and propagated across the field lines to the outer wall. The radial velocity of the blob structure, Vb, was obtained by three methods and was dominantly driven by the E×B force. The radial velocity, size of the blob showed good agreements with the results obtained by sheath-connected interchange theoretical model. Vbcorresponds to roughly 0.02–0.07 of the local sound speed (Cs) in QUEST. The higher moments (skewness S and kurtosis K) representing the shape of PDF of density fluctuation are studied. Their least squares fitting with quadratic polynomial is K=(1.60±0.27)S2−(0.46±0.20). The larger blob structures, occurring only 10% of the time, can carry more than 60% loss of the entire radial particle flux.