Abstract
An ergodic magnetic limiter (EML) creates a randomization of the magnetic field at the edge of a tokamak plasma. As a result, poloidal changes in the electron temperature and density profiles are expected. We describe an experiment in which these parameters have been measured during EML experiments on the TEXT tokamak using line ratios emitted in the VUV by intrinsic oxygen and carbon charge states isoelectronic with Be I. The spectra were recorded by means of two photometrically calibrated spectrometers equipped with time-resolving, multispectral image intensifier detectors. A scanning mirror system mounted close to the plasma at grazing incidence, enable the tangential view of the tokamak edge plasma. The reliability of the line ratio used as local density and temperature diagnostics is discussed also.
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