Radiation process of carbon ions in JT-60U detached divertor plasmas

Nakano, T.; Kubo, H.; Asakura, N.; Shimizu, K.; Kawashima, H.; Higashijima, S.

doi:10.1016/j.jnucmat.2009.01.085

Cited by 24 publications

(25 citation statements)

References 9 publications

(17 reference statements)

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“…Inspecting figure 1 reveals that for T e below 10 eV, nitrogen and argon come closest to carbon, which is known as effective intrinsic coolant in devices with carbon plasma facing components [22] [23] [24]. Neon exhibits a comparatively low cooling capacity at low electron temperatures.…”

Section: Core and Divertor Radiative Lossesmentioning

confidence: 99%

Plasma surface interactions in impurity seeded plasmas

Kallenbach

Balden

Dux

et al. 2011

Journal of Nuclear Materials

121

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With tokamak devices developing towards higher heating powers, and carbon plasma facing components being increasingly replaced by high-Z materials like tungsten, impurity seeding for radiative power dissipation gains more importance. This review summarizes the core and divertor radiative characteristics of potential seeding species, namely noble gases and nitrogen. Due to its radiative capability below 10 eV, nitrogen turns out to be a suitable replacement for carbon as a divertor radiator. For typical plasma parameters and high radiation levels, it becomes the most important eroding species for high-Z plasma fac-

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Section: Core and Divertor Radiative Lossesmentioning

confidence: 99%

Plasma surface interactions in impurity seeded plasmas

Kallenbach

Balden

Dux

et al. 2011

Journal of Nuclear Materials

121

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“…For such a purpose, spectroscopy is often a method of choice and spectroscopic measurements of impurity line radiation are routinely used for plasma diagnostics. In tokamaks with carbon tiles, such as JT-60U, carbon line radiation is one of the dominant energy loss channels [1][2][3]. In this device, impurity radiation is dominated by C III and C IV line emission.…”

Section: Introductionmentioning

confidence: 99%

“…In this device, impurity radiation is dominated by C III and C IV line emission. Intensities of lines emitted by these two species are used for the electron temperature determination and its spatial distribution in the divertor [1][2][3]. Under detachment conditions of divertor plasmas, high-members of the Balmer series of hydrogen or its isotope deuterium are observed.…”

Section: Introductionmentioning

confidence: 99%

Impact of Differing Electron and Ion Temperatures on Emission Lines of Impurities in Tokamak Divertors

Koubiti

Godbert‐Mouret

Ferri

et al. 2014

Contrib. Plasma Phys.

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In this paper we present some investigations of the broadening mechanisms affecting the emission line profiles of impurities present in the divertor regions of tokamaks. For that purpose, we have considered two visible lines (C IV n = 5-6 and n = 6-7) emitted by lithium-like carbon ions for which the contributions of the Zeeman, Stark and Doppler effects are examined. The paper is focused on the impact of differing electron and ion temperatures on the broadening and shapes of the C IV n = 6-7 line for conditions relevant to a detached tokamak divertor plasma. It is shown, that the C IV n = 6-7 line profile calculated with differing electron and ion temperatures may be significantly different from the one calculated with equal temperatures but the same density. This suggests that the electron density determination from the fit of the measured spectra of such a line may be inaccurate when using equal ion and electron temperatures instead of differing ones.

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“…As impurities are always present in these devices, the cooling can be ensured by radiation from impurities. For tokamaks like JT-60U whose walls and target plates are made of carbon materials, it has been found that the line radiation from C 3+ ions is one of the dominant energy loss channels in the divertor region of such devices [1]. It is therefore important to determine the particle balance between the impurity emitters and their radiative power.…”

Section: Introductionmentioning

confidence: 99%

“…These parameters have to be determined with a good accuracy and should be cross-checked with independent methods whenever it is possible. In the JT-60U tokamak, usually a toroidally symmetric strong radiation forms under detachment conditions [1,2]. The peak of this strong emission which is due mainly to C 3+ and C 2+ ions moves from the region located between the inner divertor leg (plate) and the X-point towards the later.…”

Section: Introductionmentioning

confidence: 99%