Development of high time- and spectral-resolved charge exchange recombination spectroscopy and fine structure of radial electric field in high-viscosity plasmas

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A high spatial- and spectral-resolved charge exchange recombination spectroscopy (CXRS) has been developed aiming at improving the resolution of the CXRS measurement. A monochromator with a numerical aperture of F2.9 has been developed having a linear dispersion of 2.82x10^<-3>nm/pixel. This corresponds to the resolution of the rotation velocity of 1.6 km/s/pixel. The sightlines for CXRS in the three dimensional magnetic configuration have been designed having a good spatial resolution around Δρ=±0.05 even when the heating neutral beam is used for diagnostics. The initial result obtained in the Heliotron J NBI plasmas shows the ion temperature and the rotation velocity have been measured with high spatial and spectral (velocity) resolution.