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Journal Articles

Highly charged tungsten spectra observed from JT-60U plasmas at $$T_{mbox{e}} approx$$ 8 and 14 keV

Yanagibayashi, Jun*; Nakano, Tomohide; Iwamae, Atsushi; Kubo, Hirotaka; Hasuo, Masahiro*; Itami, Kiyoshi

Journal of Physics B; Atomic, Molecular and Optical Physics, 43(14), p.144013_1 - 144013_6, 2010/07

https://doi.org/10.1088/0953-4075/43/14/144013
 Times Cited Count：25 Percentile：72.94(Optics)

We observe the vacuum ultraviolet spectra of highly charged tungsten ions in plasmas at electron temperatures of 8 keV and 14 keV. The observed emission lines in a wavelength range of 2.6 $$sim$$ 3.2 nm for the plasma at 8 keV are identified to be the $$3mbox{p}_{3/2}-3mbox{d}_{5/2}$$ transitions of $$mbox{W}^{47+}-mbox{W}^{54 +}$$. The observed emission lines at 2.0 nm and 2.3 nm at 14 keV are identified to be the $$mbox{3p}_{1/2}-mbox{3d}_{3/2}$$ transitions of $$mbox{W}^{55 +}-mbox{W}^{61+}$$ and $$mbox{3s}_{1/2}-mbox{3p}_{3/2}$$ transitions of $$mbox{W}^{60 +}-mbox{W}^{63+}$$, respectively.

Journal Articles

Tungsten accumulation in H-mode plasmas of JT-60U

Nakano, Tomohide; Asakura, Nobuyuki; Kubo, Hirotaka; Yanagibayashi, Jun*; Ueda, Yoshio*

Nuclear Fusion, 49(11), p.115024_1 - 115024_10, 2009/11

https://doi.org/10.1088/0029-5515/49/11/115024
 Times Cited Count：32 Percentile：74.99(Physics, Fluids & Plasmas)

It has been observed that with increasing toroidal rotation velocity inside the $$q=1$$ layer in the direction opposite to the plasma current, sawtooth activity becomes moderate and tungsten accumulation becomes significant. The tungsten accumulation level is significantly reduced from this trend in the case that electron cyclotron wave or high energy neutral beam is injected into the plasma core. In contrast, the tungsten accumulation is kept high by the electron cyclotron wave injection into the peripheral region.

Oral presentation

An Analysis of EUV spectra emitted from highly-charged tungsten ions in JT-60U high-temperature plasmas

Yanagibayashi, Jun; Nakano, Tomohide; Hasuo, Masahiro*; Iwamae, Atsushi; Kubo, Hirotaka; Itami, Kiyoshi

no journal, , 

Tungsten is one of the candidates for the divertor material of ITER because of its low retention and low hydrogen inventory. However, it is a problem that tungsten ions accumulated in a core plasma emit intense radiation and cool the plasma. For preparation of investigating the mechanism of the tungsten ion accumulation, Vaccum Ultra Violet (VUV) lines emitted from tungsten ions are identified. A VUV spectrum from a JT-60U plasma ($$T_{e} sim 6$$ keV) is observed with a flat-field grazing-incidence spectrometer. The observed spectrum is compared with a theoretical spectrum calculated with Flexible Atomic Code. It is found that the observed peaks around 3 nm are due to transitions between $$n = 3$$ levels of W$$^{q+}$$ ($$47 le q le 53$$), and that those around 5, 6 and 13 nm are due to transitions between $$n = 4$$ levels of W$$^{q+}$$ ($$41 le q le 45$$). It is believed that the former lines are useful to diagnose the tungsten ion accumulation in a high-temperature ($$T$$$$_{e}$$ $$>$$ 10 keV) plasma of ITER.

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