Abstract
A space-resolved 3m vacuum ultraviolet (vuv) spectrometer has been developed to measure a radial (vertical) profile of impurity line emissions in the Large Helical Device (LHD). The system consists of a 3m normal incidence spectrometer equipped with a space-resolved slit and a back-illuminated charge-coupled device (CCD) detector, view-angle adjustable mirrors, and a toroidal slit. A full vertical profile of the vuv line radiated from the LHD plasma is observed with a convex cylindrical mirror by extending the view angle. The vertical profiles of intrinsic impurities of carbon (C III–C V) and externally injected impurities of neon (Ne VIII), aluminum (Al XI), and argon (Ar VIII) are successfully obtained with a time interval of 125ms in the VUV range of 500–3100Å. The ion temperature profiles are also measured from the C IV line emitted in the ergodic layer of LHD.
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