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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.

Application of Zeff Profile Analysis Based on Visible Bremsstrahlung Measurement to Different Density Profiles in the LHD