Journal Article

PreJuSER-37991

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Simulation study of carbon and tungsten deposition on W/C twin test limiter in TEXTOR-94

Ohya, K. ; Kawakami, R. ; Tanabe, T. ; Wada, M. ; Ohgo, T. ; Philipps, V.FZJ* ; Pospieszczyk, A.FZJ* ; Schweer, B.FZJ* ; Huber, A.FZJ* ; Rubel, M. ; von Seggern, J.FZJ* ; Noda, N.

2001
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/S0022-3115(00)00172-0

Abstract: In order to investigate the impurity release and surface modification on a W/C twin test limiter, made of a half of W and the other half of C, exposed to the edge plasma of TEXTOR-94, simulation calculations of ion-surface interaction are conducted by a Monte Carlo code. According to the calculations, experimentally observed spatial distributions of WI and CII line intensities around the W side of the limiter can be explained by physical sputtering of W, reflection of bombarding C ions and physical sputtering of implanted C. The CII line emission, resulting from thermal C atoms, around the C side of the limiter is suppressed by deposition of W, and the reflection of C ions from W deposited on C causes the CII intensity to decay more slowly than that from C without the deposition. Bombardment with deuterium edge plasmas, containing impurity W, produces a thick W layer on the C side of the limiter, whereas C implanted in the W side is strongly sputtered due to impact of most constituent D ions. (C) 2000 Elsevier Science B.V. All rights reserved.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institutsbereich I (IPP-1)
2. Institutsbereich II (IPP-2)

Research Program(s):

1. Wandkonditionierung und Plasma-Wand-Prozesse (22.77.0)
2. Teilchen- und Energietransport in der Plasmarandschicht (22.88.5)
3. Verunreinigungsquellen in Tokamaks (22.87.5)

Appears in the scientific report 2001

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