Beryllium migration and evolution of first wall surface composition in the JET ILW configuration

K. Krieger, S. Brezinsek, M. Reinelt, S.W. Lisgo, J.W. Coenen, S. Jachmich, S. Marsen, A. Meigs, G.J. van Rooij, M. Stamp, O. van Hoey, D. Ivanova, T. Loarer, V. Philipps

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Abstract

Material migration and the resulting evolution of plasma facing surfaces were studied at the beginning of the JET ILW campaign using the singular opportunity of well-defined initial conditions with virgin Be and W wall components. In a sequence of identical Ohmically heated discharges the evolution of wall material sources as well as that of residual impurity sources were studied by spectroscopic detection of suitable emission lines of corresponding neutral atom and singly charged ion species in the visible spectral range. The evolution of divertor surface composition resulting from wall material migration occurred at a similar time scale as previously observed in Be migration experiments in the JET carbon wall configuration. In contrast to these experiments with initial Be evaporation on the carbon main chamber wall, the JET ILW migration experiment is characterised by a continuous Be wall source because the main chamber wall now consists of bulk Be components. The experiment further reveals unexpectedly high Be deposition at W divertor surfaces already during preceding limiter discharges for system commissioning, which has implications for predictive modelling of the expected fuel retention in ITER.

LanguageEnglish
JournalJournal of Nuclear Materials
Volume438
Issue numberSUPPL
DOIs
StatePublished - 2013
Externally publishedYes

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Beryllium
beryllium
Surface structure
configurations
Carbon
Experiments
Limiters
chambers
Evaporation
Impurities
Ions
Plasmas
carbon
Atoms
neutral atoms
evaporation
impurities

Cite this

Krieger, K., Brezinsek, S., Reinelt, M., Lisgo, S. W., Coenen, J. W., Jachmich, S., ... Philipps, V. (2013). Beryllium migration and evolution of first wall surface composition in the JET ILW configuration. Journal of Nuclear Materials, 438(SUPPL). DOI: 10.1016/j.jnucmat.2013.01.042
Krieger, K. ; Brezinsek, S. ; Reinelt, M. ; Lisgo, S.W. ; Coenen, J.W. ; Jachmich, S. ; Marsen, S. ; Meigs, A. ; van Rooij, G.J. ; Stamp, M. ; van Hoey, O. ; Ivanova, D. ; Loarer, T. ; Philipps, V./ Beryllium migration and evolution of first wall surface composition in the JET ILW configuration. In: Journal of Nuclear Materials. 2013 ; Vol. 438, No. SUPPL.
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abstract = "Material migration and the resulting evolution of plasma facing surfaces were studied at the beginning of the JET ILW campaign using the singular opportunity of well-defined initial conditions with virgin Be and W wall components. In a sequence of identical Ohmically heated discharges the evolution of wall material sources as well as that of residual impurity sources were studied by spectroscopic detection of suitable emission lines of corresponding neutral atom and singly charged ion species in the visible spectral range. The evolution of divertor surface composition resulting from wall material migration occurred at a similar time scale as previously observed in Be migration experiments in the JET carbon wall configuration. In contrast to these experiments with initial Be evaporation on the carbon main chamber wall, the JET ILW migration experiment is characterised by a continuous Be wall source because the main chamber wall now consists of bulk Be components. The experiment further reveals unexpectedly high Be deposition at W divertor surfaces already during preceding limiter discharges for system commissioning, which has implications for predictive modelling of the expected fuel retention in ITER.",
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Krieger, K, Brezinsek, S, Reinelt, M, Lisgo, SW, Coenen, JW, Jachmich, S, Marsen, S, Meigs, A, van Rooij, GJ, Stamp, M, van Hoey, O, Ivanova, D, Loarer, T & Philipps, V 2013, 'Beryllium migration and evolution of first wall surface composition in the JET ILW configuration' Journal of Nuclear Materials, vol. 438, no. SUPPL. DOI: 10.1016/j.jnucmat.2013.01.042

Beryllium migration and evolution of first wall surface composition in the JET ILW configuration. / Krieger, K.; Brezinsek, S.; Reinelt, M.; Lisgo, S.W.; Coenen, J.W.; Jachmich, S.; Marsen, S.; Meigs, A.; van Rooij, G.J.; Stamp, M.; van Hoey, O.; Ivanova, D.; Loarer, T.; Philipps, V.

In: Journal of Nuclear Materials, Vol. 438, No. SUPPL, 2013.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Krieger,K.

AU - Brezinsek,S.

AU - Reinelt,M.

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AU - Jachmich,S.

AU - Marsen,S.

AU - Meigs,A.

AU - van Rooij,G.J.

AU - Stamp,M.

AU - van Hoey,O.

AU - Ivanova,D.

AU - Loarer,T.

AU - Philipps,V.

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Krieger K, Brezinsek S, Reinelt M, Lisgo SW, Coenen JW, Jachmich S et al. Beryllium migration and evolution of first wall surface composition in the JET ILW configuration. Journal of Nuclear Materials. 2013;438(SUPPL). Available from, DOI: 10.1016/j.jnucmat.2013.01.042