Computer tomography system for investigation of translation process of FRC plasma on the FIX device

A computer tomography system for the investigation of the translation process of the field reversed configuration (FRC) plasma was established on the FIX device. This system was composed of three arrays of detectors sensitive to the near-infrared radiation. To avoid the light reflection at the vacuum wall, black anodized aluminum panels were installed just inside the metal chamber. Two-dimensional distributions of the light emissivity of the translated FRC plasma were reconstructed using the Fourier-Bessel expansion technique. Our results indicated that the emission reached a maximum intensity when the FRC plasma was reflected by the mirror field, and also that the temporal evolution of the width of the reconstructed emission profile had the similar tendency to that of the separatrix radius during the translation. (author)