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Modification of tomography technique for two-dimensional spectroscopic measurement in JT-60U divertor plasmas

Fujimoto, Kayoko; Nakano, Tomohide; Kubo, Hirotaka; Sawada, Keiji*; Takizuka, Tomonori; Shimizu, Katsuhiro; Kawashima, Hisato; Asakura, Nobuyuki

Understanding deuterium particle behavior in the divertor plasma is necessary to study the ionizing and recombining plasmas. Two-dimensional spectroscopic measurement of deuterium emission is useful to understand deuterium particle behavior in divertor plasmas. The information of the ionization and recombination can be obtained by measurement of deuterium Balmer-series lines. A wide-spectral-band spectrometer with a CCD detector was used to observe deuterium Balmer-series lines with two-dimensional spatial distribution in the JT-60U divertor region. From the measurement, we can obtain a two-dimensional distribution of D$$_{beta}$$ and D$$_{gamma}$$ using a computer tomography technique. The D$$_{beta}$$ emission was strong above the strike point in the inner divertor and around the strike point in the outer divertor. The D$$_{gamma}$$ emission was strong above the strike point in the inner divertor.

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