Spectroscopic investigation of carbon migration with tungsten walls in ASDEX Upgrade

A. Kallenbach, R. Dux, J. Harhausen, C. F. Maggi, R. Neu, T. Pütterich, V. Rohde, K. Schmid, E. Wolfrum

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21 Scopus citations


Spectroscopic measurements of carbon fluxes in the mainly tungsten-coated ASDEX Upgrade tokamak are analysed with a particle transport and migration code. The transport parameters for deuterium and carbon are calibrated against flux measurements for different experimental conditions. Additional information is obtained from the re-appearance time of carbon after a boronisation. The code reproduces the experimental finding that despite a 85% (2006 campaign) tungsten coverage of the primary PFCs, the carbon concentration in the core and edge plasma is reduced by about a factor 2 only compared to full carbon PFCs. This behaviour is explained by the strong main chamber recycling of carbon in comparison with the loss flux to the inner divertor. The quick recovery of the carbon level in the plasma after a boronisation is explained by carbon influx from the outer divertor.

Original languageEnglish
Pages (from-to)60-65
Number of pages6
JournalJournal of Nuclear Materials
Issue number1-3
StatePublished - 15 Jun 2007
Externally publishedYes


  • ASDEX Upgrade
  • C0100
  • Edge plasma
  • F0400
  • First wall
  • Impurity sources
  • Impurity transport
  • M0500
  • R0900
  • T0100


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