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Journal Articles

Spatial characterization of a divertor in the presence of an X-point MARFE by collisional-radiative modeling and line profile calculations

Koubiti, M.*; Nakano, Tomohide; Marandet, Y.*; Mekkaoui, A.*; Mouret, L.*; Rosato, J.*; Stamm, R.*

Journal of Nuclear Materials, 438, p.S599 - S601, 2013/07

 Times Cited Count:3 Percentile:25.83(Materials Science, Multidisciplinary)

We have measured a profile of C IV spectral line emitted from the detached diverter plasma of JT-60U with a high-wavelength resolution spectrometer, and analyzed it with PPP code. In the previous analysis, the measured spectral profile was compared with the spectral profile calculated by the PPP code with one pair of electron density and temperature. With this method, the spectral profiles measured around the X-point were well reproduced, but the spectral profile measured at a very center of the X-point was not reproduced. In the present analysis, we have succeeded to reproduce the spectral profile measured at the very center of the X-point by synthesizing two spectra calculated with two pairs of electron densities and temperatures. One pair was 1$$times$$10$$^{20}$$ m$$^{-3}$$ and 23.0 eV, and the other 1$$times$$10$$^{20}$$ m$$^{-3}$$ and 2.5 eV. The contribution to the intensity of C IV spectral line of the first pair was 65% and that of the second 35%.

Journal Articles

Characterization of the JT-60U divertor plasma region during the formation of a strong radiation

Koubiti, M.*; Nakano, Tomohide; Capes, H.*; Marandet, Y.*; Mekkaoui, A.*; Mouret, L.*; Rosato, J.*; Stamm, R.*

Contributions to Plasma Physics, 52(5-6), p.455 - 459, 2012/06

 Times Cited Count:4 Percentile:17.82(Physics, Fluids & Plasmas)

The spectral profile of C IV ($$n$$=6-7) measured from the strong radiation zone (X-point MARFE) in a detached plasma of JT-60U with a high resolution spectrometer was analyzed by PPP code. In the previous analysis, a spectral profile calculated by the PPP code with an input of single pair of electron density and temperature was compared to the measured spectral profile. It was found that the spectral profiles measured around the X-point MARFE were reproduced with the calculated spectral profile but the ones measured at the center of the X-point MARFE were not. In the present analysis, two spectral profiles were calculated with two pairs of electron density and temperature and were summed up, leading to successful reproduction of the measured spectral profile. The two pairs of electron density and temperature used for the calculation were 1$$times$$10$$^{20}$$ m$$^{-3}$$ and 23.0 eV, and 6$$times$$10$$^{20}$$ m$$^{-3}$$ and 2.5 eV, respectively, with a mixture ratio of 65:35.

Journal Articles

Diagnostics of JT-60U divertor plasmas by Stark-Doppler broadening of carbon spectral lines

Koubiti, M.*; Nakano, Tomohide; Godbert-Mouret, L.*; Marandet, Y.*; Rosato, J.*; Stamm, R.*

Journal of Nuclear Materials, 415(Suppl.1), p.S1151 - S1154, 2011/08

 Times Cited Count:4 Percentile:32.68(Materials Science, Multidisciplinary)

The C IV ($$n$$ = 6-7) spectral lines emitted from the JT-60U detached plasmas were observed with a high-wavelength resolution spectrometer and the profiles were analyzed with a PPP code. The analysis indicates that the spectral profiles were broadened with both the Doppler and the Stark effects. From these effects, the electron temperature and density were evaluated. Along the viewing chord for the X-point, the electron temperature and density was determined to be 3 eV and $$7 times 10^{20}mbox{m}^{-3}$$, respectively. These are similar to those determined from the intensity ratio of C IV lines (6.3 eV and $$7.8 times 10^{20}mbox{m}^{-3}$$, respectively). The high density plasma around the X-point was confirmed with these independent methods.

Journal Articles

Diagnostics of tokamak divertor plasmas by Stark broadening of impurity emission lines

Koubiti, M.*; Nakano, Tomohide; Capes, H.*; Marandet, Y.*; Mouret, L.*; Rosato, J.*; Stamm, R.*

Proceedings of 37th European Physical Society Conference on Plasma Physics (EPS 2010) (CD-ROM), 4 Pages, 2010/06

The C IV ($$n$$ = 6-7) spectral lines emitted from the JT-60U detachedplasmas were observed with a high-wavelength resolution spectrometer and theprofiles were analyzed with a PPP code. The analysis indicates that thespectral profiles were broadened with both the Doppler and the Starkeffects. From these effects, the electron temperature and density wereevaluated. Along the viewing chord for the X-point, the electron temperatureand density was determined to be 3 eV and 7$$times$$10$$^{20}$$m$$^{-3}$$, respectively. These are similar to those determined from the intensity ratioof C IV lines (6.3 eV and 7.8 $$times$$ 10$$^{20}$$ m$$^{-3}$$, respectively). The high density plasma around the X-point was confirmed withthese independent methods.

Journal Articles

Investigation of C IV line broadening mechanisms for plasma diagnostics in magnetic fusion devices

Koubiti, M.*; Nakano, Tomohide; Capes, H.*; Ferri, S.*; Godbert-Mouret, L.*; Marandet, Y.*; Rosato, J.*; Stamm, R.*

Journal of Nuclear Materials, 390-391, p.1142 - 1144, 2009/06

 Times Cited Count:3 Percentile:24.54(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Broadening of lithium-like carbon spectral lines emitted in tokamak plasmas

Koubiti, M.*; Nakano, Tomohide; Capes, H.*; Marandet, Y.*; Mouret, L.*; Rosato, J.*; Stamm, R.*

Europhysics Conference Abstracts (CD-ROM), 31F, 4 Pages, 2007/00

no abstracts in English

Oral presentation

On the use of spectral lines emitted by carbon ions for plasma diagnostics in magnetic fusion devices

Koubiti, M.*; Nakano, Tomohide; Ferri, S.*; Godbert-Mouret, L.*; Marandet, Y.*; Rosato, J.*; Stamm, R.*

no journal, , 

Lithium-like carbon lines have been analyzed to obtain the electron density and temperature of the emissive plasma region in the tokamak divertor, where high electron density up to $$10^{22} m^{-3}$$ have been deduced near the X-point region for detached plasmas. To confirm the measured electron density, we propose to use line broadening. In this paper, profiles of C IV n=5-6 ($$lambda$$ = 465.8 nm) and n=6-7 ($$lambda$$= 772.6 nm) lines are computed for plasma conditions of tokamak divertors ($$n_e=10^{19}-10^{22} m^{-3}$$, $$T_e$$=1-10 eV). The first comparisons are promising and encourage fitting of various experimental data from JT-60U and other magnetic fusion devices. Our results are based on calculations made with a modified version of the PPP line shape code using an atomic data basis built with the most accurate available data for carbon in addition to the Cowan code.

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