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Magnetic surface Mapping Experiments in TJ-ll Heliac

In December 1996 a short campaign of magnetic surface measurements were carried out in TJ-II. A limited number of configurations were studied with the main goal of checking that the high accuracy required in positioning of the coils and the vacuum vessel had been achieved. The existence of closed and nested magnetic surfaces, in good agreement with the calculated ones, demonstrated this issue. In this work the results obtained are discussed.