Wall conditioning by microwave generated plasmas in a toroidal magnetic field
2001 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 290, 1180-1184 p.Article in journal (Refereed) Published
The suitability of microwave generated plasmas for the purpose of wall coating in purr toroidal magnetic fields is investigated in a special test bench. We report on the results of layer deposition using methane plasmas as a systematic case study for future boron or silicon deposition by other gases (B2H6, SiH4). The produced coatings can be characterized as polymer-like soft a-C:D-films with a high DIG-ratio due to the low energy of particles hitting the wall. Neutral hydrocarbon radicals could be identified to play the major role for film deposition. On the other hand, strong re-erosion induced by deuterium ions is observed in regions with plasma-wall contact. The spatial homogeneity and the characteristics of produced coatings are presented and observations are correlated with measured plasma parameters. The use of pulsed plasmas for wall conditioning is compared with steady-state discharges,
Place, publisher, year, edition, pages
2001. Vol. 290, 1180-1184 p.
a-C : D, wall coating, ECR, future fusion devices, erosion, films
IdentifiersURN: urn:nbn:se:kth:diva-20475DOI: 10.1016/S0022-3115(00)00671-1ISI: 000167676700235OAI: oai:DiVA.org:kth-20475DiVA: diva2:339170
QC 201005252010-08-102010-08-10Bibliographically approved