First result on Z_(eff)Profile Analysis from Visible remsstrahlunl Measurement for Different Density Profiles in LHD

摘要

Visible bremsstrahlung emission has been measured using a optimized Czemy-Turner spectrometer newly installed on LHD. The bremsstrahlung emission profile has been successfully observed in some limited discharge conditions having no asymmetric strong edge bremsstrahlung emissions which are originated in the ergodic layer. Z_(eff) profiles are analyzed for peaked, flat and hollow density profiles as the first trial of the analysis. As a result, a flat Zen profile is obtained for all different density profiles. It indicates that the partial impurity pressure is basically constant against the plasma radius