Fast Algorithm for Tomographic Reconstruction for Plasma Emission

Abstract

Temporal evolution of two dimensional image of plasma emission has been obtained using a reconstruction algorithm called Maximum Likelihood-Expectation Maximization (MLEM), with a tomography system in a linear cylindrical plasma. The calculation of tomography images for the whole plasma duration needs parallel computation due to the iteration processes of MLEM. However, faster and simpler tomography algorithm giving a consistent image with MLEM should be desirable for monitoring the emission profile and quick analysis between shots. This paper proposes such a new algorithm of a modified Tikhonov regularization with introducing a weight matrix, termed here direct matrix reconstruction (DMR).