Visible bremsstrahlung emission has been measured along the vertical direction of a horizontally elongated plasma cross section in a range of −0.6 m ≤ z ≤ 0.0 m from an inwardly shifted (Rax ≤ 3.6 m) configuration by means of an optimized Czerny-Turner spectrometer installed on the Large Helical Device. Chord-integrated bremsstrahlung intensity profiles have been observed in discharges having no asymmetric strong edge bremsstrahlung emission originating in the ergodic layer. Radial bremsstrahlung emission profiles are obtained from the chord-integrated profiles based on an Abel inversion method. Zeff profiles are thus analyzed for peaked, flat, and hollow density profiles, which are measured with a Thomson scattering diagnostic, as the first trial of the analysis. As a result, a flat Zeff profile is obtained for all different density profiles with values of 1 < Zeff ≤ 2. This indicates that the partial impurity pressure is essentially constant against the plasma radius.
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Zhou et al. (2010) studied this question.
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