Simulation study of carbon and tungsten deposition on W/C twin test limiter in TEXTOR-94

QC 20100525
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.

By the author/editor: Ohya, K.; Kawakami, R.; Tanabe, T.; Wada, M.; Ohgo, T.; Philipps, V.; show more...; Pospieszczyk, A.; Schweer, B.; Huber, A.; Rubel, Marek J.; von Seggern, J.; Noda, N.; show less...

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