the electron density profile must also be measured simultaneously in order to unfold the current distribution. In earlier papers, we described our experiments on ISX-B1 and TFTR5 tokamaks. This paper presents our recent results of both theoretical and experimental studies. Detailed mathematical analyses and experiments will be reported at the symposium. Only a brief description of the work is, therefore, presented in the following. THEORETICAL ANALYSES An algorithm for the solution of the polarization equation has been developed and
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