- Conference date: 27–31 October 2008
- Location: Beijing (China)
In high density and low temperature peripheral plasmas of JT‐60 U, i.e. detached divertor plasmas, C III and C IV lines were observed by a visible and VUV spectrometers in order to investigate dominant radiators, radiation power and particle balance between the radiators. An emission peak was found between the inner strike and the X‐point. With increasing electron density, the emission peak moved to the X‐point with a constant electron temperature of In the case the emission peak was located on the X‐point, the dominant radiators in the emission peak were and which contributed 30% and 60% to the total radiative power. It was found that was produced by the ionization of and the volume recombination of at a similar rates. However, the loss flux of was lower by two orders of magnitude than the production flux, indicating that another loss mechanism such as transport loss around the X‐point was significant.
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