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.
In this study, a previously proposed three-dimensional (3D) tomography method using a multiple-pinhole camera is applied experimentally to detect 3D structures in reversed-field pinch plasmas. The 3D structure of the toroidal plasma was successfully reconstructed and found to be consistent with magnetic field measurements at the plasma's edge. The results also indicate that toroidal mode number estimation may be possible using the images from the multiple-pinhole camera.
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