The breakup of methane under ITER divertor hydrogen plasma conditions for carbon chemical erosion analysis with CH spectroscopy

TitleThe breakup of methane under ITER divertor hydrogen plasma conditions for carbon chemical erosion analysis with CH spectroscopy
Publication TypeJournal Article
Year of Publication2010
AuthorsJ. Westerhout, D. Borodin, S. Brezinsek, N.JL Cardozo, J. Rapp, D.C. Schram, G.J van Rooij
JournalNuclear Fusion
Volume50
Number9
Pagination10
Date PublishedSep
Type of ArticleArticle
ISBN Number0029-5515
Accession NumberISI:000280770700003
KeywordsCHAPTER 1, COLLISION PROCESSES, ELECTRONS, EMISSION, GRAPHITE, HYDROCARBON FORMATION, IMPACT, SURFACES, TOKAMAKS, TRANSPORT
Abstract

Methane (CH4) was injected into the high density (n(e) similar to 10(20) m(-3)), low temperature (T-e similar to 1 eV) hydrogen plasma in Pilot-PSI to determine the CH A-X photon efficiency in this unexplored plasma regime. The effects of particle transport and particle reflection on the emission of directly excited CH under these plasma conditions were assessed with the 3D Monte Carlo code ERO. The simulations of the inverse photon efficiency showed a difference of similar to 20% between full hydrocarbon sticking or no sticking (reflection). In addition it predicts that particle transport may lead to more than a factor of 10 increase. The measured inverse photon efficiency is however constant at 100 +/- 30 for 0.1

URL<Go to ISI>://000280770700003
Division

Fusion Physics

Department

PSI

PID

eeb8df9666f1369f9f0e08cc92194fc8

Alternate TitleNucl. Fusion

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