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PFC / JA-95-12 A Comparison of Soft X-Ray Emissivity Contours with Magnetic Flux Surfaces in Alcator C-Mod

The soft X-ray diagnostic system of Alcator C-Mod, equipped with 152 detectors distributed in 4 arrays, has been used to obtain iso-emissivity surfaces. We characterize these surfaces by giving their elongation and relative shift from the center of the tokamak as functions of plasma radius. Flux surfaces, provided by magnetic diagnostics, have also been described with elongation and shift. Results from the comparison of the two sets of geometric parameters obtained from magnetic and X-ray diagnostics are presented. We find that, for all the discharges that we have analyzed, soft X-ray contours do not coincide with magnetic surfaces.' A study of possible explanations for the discrepancy found between elongations obtained from these two diagnostics is described and discussed in this paper.