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Home / Publications / Journals / Fusion Science and Technology / Volume 51 / Number 2T

Two-Dimensional Spectroscopic Measurement of Hydrogen Emission in JT-60U Divertor Plasmas

K. Fujimoto, T. Nakano, H. Kubo, H. Kawashima, K. Shimizu, N. Asakura (19P12)

Fusion Science and Technology / Volume 51 / Number 2T / February 2007 / Pages 247-249

Technical Paper / Open Magnetic Systems for Plasma Confinement

In JT-60U divertor plasmas, deuterium Balmer-series line emission has been measured with a wide-spectral-band spectrometer, which has 92 viewing chords with a ~1cm spatial resolution. Two-dimensional spatial distribution of the Balmer line intensities has been reconstructed using a computer tomography technique (maximum entropy method). In an inner-detached and outer-attached divertor plasma, the intensity of D and D lines were stronger above the strike point in the inner divertor and near the strike point in the outer divertor. The ratio of the D line intensity to the D line intensity was 0.3 - 0.5 above the strike point in the inner divertor and 0 - 0.2 near the strike point in the outer divertor. It suggested that the line emission were attributed to the plasma recombination above the strike point in the inner divertor and the plasma ionization near the strike point in the outer divertor.

 
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