Wall treatment by reactive gas fuelling into TEXTOR plasma discharges
The deposition of thin film onto the inner walls of tokamaks by plasma enhanced chemical vapour deposition (PECVD) has proved to be a most effective conditioning technique for tokamaks. Nevertheless this is not compatible with future long pulse fusion devices (ITER pulses longer than 1000 s) using permanently superconductive magnetic coils. For this reason a technique has been developed with a continuous or quasi-continuous source for low-Z getter material as used in PECVD. First experiments have been performed using this new conditioning method, named reactive gas fuelling (RGF), which allows on-line conditioning during plasma discharges. Reactive gases such as borontrimethylsilane are fuelled into proceeding tokamak discharges for conditioning purposes. The plasma boundary takes over the poloidal and toroidal distribution of the reactive species, but otherwise the same conditioning mechanisms are effective as in PECVD.
Bibliographic Reference: Article: Journal of Nuclear Materials, Vols. 212-215 (1994) pp. 1546-1551
Record Number: 199411566 / Last updated on: 1995-01-10
Original language: en
Available languages: en