Hydrocarbon injection for quantification of chemical erosion yields in tokamaks

S. Brezinsek*, A. Pospieszczyk, D. Borodin, M. F. Stamp, R. Pugno, A. G. McLean, U. Fantz, A. Manhard, A. Kallenbach, N. H. Brooks, M. Groth, Ph Mertens, V. Philipps, U. Samm, TEXTOR, ASDEX Upgrade, DIII-D Teams , JET-EFDA Contributors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

54 Citations (Scopus)

Abstract

Chemical erosion of carbon can be described as function of the incident ion flux, the ion energy and the surface temperature. Spectroscopy on the hydrocarbon break-up products CH and C2 is applied to determine in-situ hydrocarbon fluxes and quantify the chemical erosion by means of hydrocarbon injection. Present-day knowledge on critical issues concerning the erosion yield and its determination is presented: Effective inverse photon efficiencies are measured in TEXTOR for different hydrocarbon species and compared with calculations from HYDKIN. The underlying database for the methane break-up, used in different erosion/deposition models, has been put to test. The chemical erosion yield related to higher hydrocarbons is determined to be lower in the JET outer divertor than measured in previous experiments. In ASDEX Upgrade and DIII-D first in-situ calibrations of hydrocarbon fluxes in the detached outer divertor are performed.

Original languageEnglish
Pages (from-to)1119-1128
Number of pages10
JournalJournal of Nuclear Materials
Volume363-365
DOIs
Publication statusPublished - 15 Jun 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • Carbon impurities
  • Divertor
  • Erosion and deposition
  • ITER
  • Spectroscopy

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