Estimate of the Deposition Profile of Carbon Pellets Using a High-Speed VUV Imaging System in the LHD

摘要

The deposition profile of the impurity pellet is measured by a two-dimensional fastframing vacuum ultraviolet(VUV)camera system in the large helical device(LHD).The fast framing camera selectively measures the emission from the by drogen-like ions of carbon(C VI)with a frame rate of several kHz.From the emission profile of the hydrogen-like carbon ions,which are in the process of ionization,the initial deposition profile of the carbon is estimated using a simple one-dimensional transport model.