Journal ArticleDOI
Volume recombination of C4+ in detached divertor plasmas of JT-60U
T. Nakano,Hirotaka Kubo,Nobuyuki Asakura,Katsuhiro Shimizu,S. Konoshima,K. Fujimoto,Hisato Kawashima,S. Higashijima +7 more
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In this article, volume recombination of C4+ and e? into C3+ was observed for the first time in detached divertor plasmas with an X-point MARFE.Abstract:
Volume recombination of C4+ and e? into C3+ is observed for the first time in detached divertor plasmas with an X-point MARFE. The recombination zone is located around the X-point, and the electron temperature and density are evaluated to be 6.3?eV and 7.8 ? 1020?m?3, respectively. In this zone, the volume recombination flux is larger by two orders of magnitude than the ionization flux of C3+. However, the radiation power due to the recombination process is only 2% of the total radiation power, measured by a bolometer. In contrast, the radiation power due to the excitation process from the ground state of C3+ by electron collision dominates the total radiation power.read more
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Journal ArticleDOI
Tungsten accumulation in H-mode plasmas of JT-60U
TL;DR: In this article, 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.
Journal ArticleDOI
Radiation process of carbon ions in JT-60U detached divertor plasmas
TL;DR: In this article, the spectral lines of C 2 + and C 3 + emitted around the X-point in the detached plasma with MARFE were measured with a VUV spectrometer and a two-dimensional visible spectrometers in order to compare the generation flux of C 3+ (ionization of C 4 + and recombination of c 4 + ) and the loss flux of c 3 + (ionisation and recombinations of C3 + ).
Journal ArticleDOI
Contribution of Ne ions to radiation enhancement in JT-60U divertor plasmas
TL;DR: In this article, the emission spectra from Ne seeded divertor plasmas of JT-60U were measured by an absolutely calibrated vacuum ultraviolet spectrometer and analyzed with a collisional-radiative model.
Journal ArticleDOI
Tungsten transport and accumulation in JT-60U
TL;DR: In this paper, absolute density and radiative power of W ions in the core plasma are determined, from previously published relative data (Nakano et al., 2009 [1] ), with an absolutely calibrated VUV spectrometer using atomic data calculated with FAC code.
Journal ArticleDOI
Spatial Structure of Volume Recombination in JT-60U Detached Divertor Plasmas
K. Fujimoto,Tomohide Nakano,Hirotaka Kubo,Keiji Sawada,Tomonori Takizuka,Hisato Kawashima,Katsuhiro Shimizu,Nobuyuki Asakura +7 more
TL;DR: In this paper, the two-dimensional distributions of Dα, Dβ, Dγ and Dδ were reconstructed from line-integral measurements, and it was shown that at an emission peak above the inner strike point, the population density of high n levels (n = 4, 5 and 6) is determined by the electron-ion volume recombination with an electron temperature and density of 0.2-0.5 eV and 1 × 1020 m-3, respectively.
References
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Journal ArticleDOI
Review of MARFE phenomena in tokamaks
TL;DR: A review of MARFEs and detached plasmas can be found in this paper, where the relationship between boundary layer parameter scalings, the MARFE threshold and the density limit is explored.
Journal ArticleDOI
The two-dimensional structure of radiative divertor plasmas in the DIII-D Tokamak
M.E. Fenstermacher,S.L. Allen,N.H. Brooks,Dean A. Buchenauer,T. N. Carlstrom,J.W. Cuthbertson,E. J. Doyle,T.E. Evans,P.-M. Garbet,R. W. Harvey,D. N. Hill,A.W. Hyatt,R.C. Isler,G.L. Jackson,R. A. James,R. Jong,C. Christopher Klepper,C.J. Lasnier,A.W. Leonard,M.A. Mahdavi,R. Maingi,W.H. Meyer,R.A. Moyer,D. G. Nilson,T.W. Petrie,G.D. Porter,T. L. Rhodes,M.J. Schaffer,R.D. Stambaugh,Daniel Thomas,S. Tugarinov,M. R. Wade,J.G. Watkins,W.P. West,Dennis Whyte,R. D. Wood +35 more
TL;DR: In this article, the two-dimensional (2D) spatial profiles of divertor plasma density, temperature, and emissivity in the DIII-D tokamak under highly radiating conditions are presented.
Journal ArticleDOI
The role of particle sinks and sources in Alcator C-Mod detached divertor discharges
Bruce Lipschultz,J.L. Terry,C. Boswell,John Goetz,A.E. Hubbard,Sergei Krasheninnikov,Brian LaBombard,D. A. Pappas,C. S. Pitcher,F. Wising,S.J. Wukitch +10 more
TL;DR: In this article, a scaling of the density in the divertor recombining region for low confinement mode plasmas is found, and a model based on pressure variation along a flux surface during detachment is consistent with the main features of this scaling.
Journal ArticleDOI
Multichordal charge exchange recombination spectroscopy on the JT-60U tokamak
TL;DR: In this paper, the JT-60U charge exchange recombination spectroscopy (CXRS) diagnostic system is reported, where measurements of the radial profiles of the ion temperatures, the toroidal and poloidal rotation velocities, and the impurity density are based on CXR spectra of fully stripped carbon ions induced by neutral beam injection.
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