Soft X-ray tomography in the JIPP T-II stellarator

Abstract
Tomography based on poloidal harmonic expansion is modified to be applied to an elliptical source in order to investigate the internal mode structures due to tearing modes in the ℓ = 2 stellarator configuration. This method was applied to the soft X-ray signals of the JIPP T-II stellarator and the image of the m = 2 magnetic island of the plasma was obtained.