Observation of Radial Displacement of Translated Field Reversed Configuration Plasma Using Computer Tomography at Two Different Cross Sections

Radial displacement of field reversed configuration (FRC) plasma was observed in translation experiments using computer tomography (CT) at two different cross sections in the FIX machine. Two sets of CT devices were installed at the upstream and downstream sides of the confinement chamber. Each CT device has three arrays of detectors sensitive to the near-infrared radiation. The Fourier-Bessel inversion technique was employed to reconstruct the two-dimensional distributions of light emitted from the FRC plasma. In some cases, the peak of the reconstructed emission profile at both upstream and downstream sides was displaced from the center in the same direction, suggesting that the FRC plasma was displaced as a rigid body in the radial direction without tilting.