Impact of nitrogen seeding on carbon erosion in the JET divertor

S. Brezinsek; S. Jachmich; J. Rapp; A. G. Meigs; C. Nicholas; M. O'Mullane; A. Pospieszczyk; G. Van Rooij

doi:10.1016/j.jnucmat.2010.12.097

Impact of nitrogen seeding on carbon erosion in the JET divertor

S. Brezinsek, S. Jachmich, J. Rapp, A. G. Meigs, C. Nicholas, M. O'Mullane, A. Pospieszczyk, G. Van Rooij

Laboratory for Plasma Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Nitrogen has been introduced in H-mode plasmas in JET in order to study its radiation cooling capability and impact on the erosion of divertor plasma-facing components made of carbon-fiber composites (CFC). Experiments in the ionizing plasma regime with low nitrogen injection show a reduction of the total carbon erosion in the divertor measured with the aid of optical spectroscopy on C⁺. Though chemical sputtering by nitrogen takes place, identified by the appearance of CN B-X band emission, the additional carbon source is overcompensated by a reduction of regular sputtering by deuterium bombardment. Moderate plasma cooling associated with reduction of the sputtering yield and dilution of the CFC surface by nitrogen can be attributed to the favorable reduction of the carbon source.

Original language	English
Pages (from-to)	624-628
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	417
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2010.12.097
Publication status	Published - 1 Oct 2011

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10.1016/j.jnucmat.2010.12.097

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title = "Impact of nitrogen seeding on carbon erosion in the JET divertor",

abstract = "Nitrogen has been introduced in H-mode plasmas in JET in order to study its radiation cooling capability and impact on the erosion of divertor plasma-facing components made of carbon-fiber composites (CFC). Experiments in the ionizing plasma regime with low nitrogen injection show a reduction of the total carbon erosion in the divertor measured with the aid of optical spectroscopy on C+. Though chemical sputtering by nitrogen takes place, identified by the appearance of CN B-X band emission, the additional carbon source is overcompensated by a reduction of regular sputtering by deuterium bombardment. Moderate plasma cooling associated with reduction of the sputtering yield and dilution of the CFC surface by nitrogen can be attributed to the favorable reduction of the carbon source.",

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AU - Brezinsek, S.

AU - Jachmich, S.

AU - Rapp, J.

AU - Meigs, A. G.

AU - Nicholas, C.

AU - O'Mullane, M.

AU - Pospieszczyk, A.

AU - Van Rooij, G.

PY - 2011/10/1

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N2 - Nitrogen has been introduced in H-mode plasmas in JET in order to study its radiation cooling capability and impact on the erosion of divertor plasma-facing components made of carbon-fiber composites (CFC). Experiments in the ionizing plasma regime with low nitrogen injection show a reduction of the total carbon erosion in the divertor measured with the aid of optical spectroscopy on C+. Though chemical sputtering by nitrogen takes place, identified by the appearance of CN B-X band emission, the additional carbon source is overcompensated by a reduction of regular sputtering by deuterium bombardment. Moderate plasma cooling associated with reduction of the sputtering yield and dilution of the CFC surface by nitrogen can be attributed to the favorable reduction of the carbon source.

AB - Nitrogen has been introduced in H-mode plasmas in JET in order to study its radiation cooling capability and impact on the erosion of divertor plasma-facing components made of carbon-fiber composites (CFC). Experiments in the ionizing plasma regime with low nitrogen injection show a reduction of the total carbon erosion in the divertor measured with the aid of optical spectroscopy on C+. Though chemical sputtering by nitrogen takes place, identified by the appearance of CN B-X band emission, the additional carbon source is overcompensated by a reduction of regular sputtering by deuterium bombardment. Moderate plasma cooling associated with reduction of the sputtering yield and dilution of the CFC surface by nitrogen can be attributed to the favorable reduction of the carbon source.

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Impact of nitrogen seeding on carbon erosion in the JET divertor

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