Simulation of spectroscopic patterns obtained in W/C test-limiter sputtering experiment at TEXTOR

D. Kondratyev; D. Borodin; A. Kirschner; S. Brezinsek; J. W. Coenen; M. Laengner; H. Stoschus; L. Vainshtein; A. Pospieszczyk; U. Samm

doi:10.1016/j.jnucmat.2013.01.066

Simulation of spectroscopic patterns obtained in W/C test-limiter sputtering experiment at TEXTOR

D. Kondratyev, D. Borodin, A. Kirschner, S. Brezinsek, J. W. Coenen, M. Laengner, H. Stoschus, L. Vainshtein, A. Pospieszczyk, U. Samm

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Abstract

On the TEXTOR tokamak various experiments aimed at investigation of tungsten erosion and transport are performed. In one experiment a spherical W/C twin limiter positioned close to the last-closed flux surface in the near scrape-off layer was exposed to a number of comparable plasma discharges with stepwise variations of edge plasma parameters. Spatial distribution of tungsten and carbon light emission was recorded with two dimensional CCD cameras and spectrometer systems with high spectral and spatial resolution. Penetration depths, tungsten sputtering fluxes and erosion yields were measured. Comparison between experimental data and the results of modelling with the 3D Monte-Carlo code ERO is performed. The main objective of this study was to test the adequacy of the existing atomic data for neutral tungsten. The modelled penetration depths of the light emission of tungsten are a factor of 2-3 smaller than in experiment, which may indicate the overestimation of ionization rates.

Original language	English
Pages (from-to)	S351-S355
Journal	Journal of Nuclear Materials
Volume	438
Issue number	SUPPL
DOIs	https://doi.org/10.1016/j.jnucmat.2013.01.066
State	Published - 2013
Externally published	Yes

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10.1016/j.jnucmat.2013.01.066

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title = "Simulation of spectroscopic patterns obtained in W/C test-limiter sputtering experiment at TEXTOR",

abstract = "On the TEXTOR tokamak various experiments aimed at investigation of tungsten erosion and transport are performed. In one experiment a spherical W/C twin limiter positioned close to the last-closed flux surface in the near scrape-off layer was exposed to a number of comparable plasma discharges with stepwise variations of edge plasma parameters. Spatial distribution of tungsten and carbon light emission was recorded with two dimensional CCD cameras and spectrometer systems with high spectral and spatial resolution. Penetration depths, tungsten sputtering fluxes and erosion yields were measured. Comparison between experimental data and the results of modelling with the 3D Monte-Carlo code ERO is performed. The main objective of this study was to test the adequacy of the existing atomic data for neutral tungsten. The modelled penetration depths of the light emission of tungsten are a factor of 2-3 smaller than in experiment, which may indicate the overestimation of ionization rates.",

author = "D. Kondratyev and D. Borodin and A. Kirschner and S. Brezinsek and Coenen, {J. W.} and M. Laengner and H. Stoschus and L. Vainshtein and A. Pospieszczyk and U. Samm",

year = "2013",

doi = "10.1016/j.jnucmat.2013.01.066",

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AU - Kondratyev, D.

AU - Borodin, D.

AU - Kirschner, A.

AU - Brezinsek, S.

AU - Coenen, J. W.

AU - Laengner, M.

AU - Stoschus, H.

AU - Vainshtein, L.

AU - Pospieszczyk, A.

AU - Samm, U.

PY - 2013

Y1 - 2013

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AB - On the TEXTOR tokamak various experiments aimed at investigation of tungsten erosion and transport are performed. In one experiment a spherical W/C twin limiter positioned close to the last-closed flux surface in the near scrape-off layer was exposed to a number of comparable plasma discharges with stepwise variations of edge plasma parameters. Spatial distribution of tungsten and carbon light emission was recorded with two dimensional CCD cameras and spectrometer systems with high spectral and spatial resolution. Penetration depths, tungsten sputtering fluxes and erosion yields were measured. Comparison between experimental data and the results of modelling with the 3D Monte-Carlo code ERO is performed. The main objective of this study was to test the adequacy of the existing atomic data for neutral tungsten. The modelled penetration depths of the light emission of tungsten are a factor of 2-3 smaller than in experiment, which may indicate the overestimation of ionization rates.

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Simulation of spectroscopic patterns obtained in W/C test-limiter sputtering experiment at TEXTOR

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