An improved Abel inversion method modified for tangential interferometry in tokamak

Abstract

An improved Abel inversion technique has been developed for an accurate reconstruction of the electron density profile in the tangential interferometer system. A conventional slice-and-stack method has been modified in various ways for tangential interferometer data, and their results are compared with various density profiles. Among them, an improved inversion technique of double linear density method shows good reconstructions of all those density profiles even with measurement errors accounted. Especially, it provides better-reconstructed profiles at the edge. This technique has been successfully applied to KSTAR (Korea superconducting tokamak advanced research) tokamak for the design of the KSTAR tangential interferometer system.