Impact of nitrogen seeding on carbon erosion in the JET divertor

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Brezinsek, S. and Jachmich, S. and Rapp, J. and Meigs, A. G. and Nicholas, C. and OMullane, M. and Pospieszczyk, A. and van Rooij, G. (2011) Impact of nitrogen seeding on carbon erosion in the JET divertor. Journal of Nuclear Materials, 417 (1-3). pp. 624-628. ISSN 0022-3115 (https://doi.org/10.1016/j.jnucmat.2010.12.097)

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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.

  • Item type:Article
    ID code:41564
    Dates:
    Date
    Event
    1 October 2011
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:18 Oct 2012 15:59
    Last modified:11 Nov 2024 10:15
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/41564
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