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In order to investigate the response of tokamak plasmas to a silicon environment, initial experiments have been performed in TEXTOR with silicon covered inner wall surfaces and SiH(4) gas puffing. The main emphasis was on impurity control, radiated power fraction and radial location of the plasma radiation, the operational regime of TEXTOR, and the operational range and properties of high confinement discharges. Based on laboratory experiments, a new plasma assisted coating procedure was developed. The process uses a radiofrequency assisted dc glow discharge in a throughflowing SiH(4)-CH(4)-He gas mixture. The gas composition was sequentially modulated between SiH(4) + He (8 min) and pure He (3 min) in order to achieve hydrogen depleted coatings. Depth profiles of the film composition on specimens exposed in TEXTOR during siliconisation show that they consist of hydrogen containing silicon without any other contaminating elements.

Additional information

Authors: WINTER J ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);JACKSON G L, General Atomics, San Diego (US)
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. I (1993) pp. 279-282
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