The relationship between the edge toroidal field B t and the rotation of the spatial structure of visible light emitted from reversed field pinch (RFP) plasmas is reported. The rotation of the spatial structure of visible light is captured by a high-speed camera attached to a horizontal viewing port of the RELAX , which was designed for RFP experiments. It is found that the rotation velocity and the direction of the spatial structure of visible light depend on B t . In the non-reversal case, the structure rotates in the co-current direction, while in the countercurrent direction in the reversal case. The frequency and direction of the spatial structure of visible light are consistent with magnetic fluctuations measured by magnetic probes.
A new passive monitoring system applied to large surface wave plasmas (SWP) is experimentally tested. In the first experiment, spatial distributions of the electron density and temperature are measured using double probes. Subsequently, an integral photography with deconvolution techniques is applied to identify the three-dimensional emissivity distribution of SWP. The result obtained from the first experiment seems to identify the localization of SWP around the antenna launching an 860-MHz microwave.
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