Anomalous transport due to large coherent structures, or coherent events, is studied experimentally in a magnetized toroidal discharge plasma. The present analysis emphasizes anomalous plasma losses as well as transport of electron thermal energy density across magnetic field lines. The experiment was carried out in the Blaamann device at the University of Tromsø. The diagnostics are based on data for potential, density and electron temperature variations as detected by Langmuir probes. Most of the data analysis uses conditional sampling. The flux of thermal energy density can be broken down into several components which are analyzed separately. Experimental means for obtaining the space-time variation of the complete polarization drifts are demonstrated, and the results compared with the fluctuating -velocities. For the present conditions these polarization drifts contribute only little to the plasma losses, but for other discharge parameters in heavier gases they can be important. Our results show that while the density, the potential and the electric field variations are dominated by large scales, the vorticity of the -flow as well as the ion polarization drifts are strongly intermittent.
大尺度相干结构（即相干事件）引起的反常输运，在磁化环形等离子体中被实验研究。本文分析的重点是反常等离子体损失以及电子热能密度横越磁力线的输运。实验在特罗姆瑟大学的Blaamann装置上进行。诊断基于朗缪尔探针所测得的电位、密度和电子温度变化数据。大部分数据分析采用条件采样方法。热能密度通量可分解为若干分量，并分别加以分析。实验展示了获取完整极化漂移时空变化的方法，并将结果与涨落速度进行了比较。在现有条件下，这些极化漂移对等离子体损失贡献甚微，但在其他放电参数及较重气体中，它们可能具有重要意义。我们的结果表明，尽管密度、电位和电场的变化由大尺度主导，但流动的涡度以及离子极化漂移则表现出强烈的间歇性。