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A concept is suggested to compensate erosion of first wall material by the local injection of reactive gases through divertor plates or limiters, forming a deposit on their surfaces. Initial experiments were performed in TEXTOR in which silane gas (SiD(4)) was blown through a hole in a graphite test limiter during ohmic discharges. The gas was ionised and partly deposited in the vicinity of the injection hole, at areas subject to the highest heat load. Without gas puffing these are erosion dominated zones. The deposition of a silicon layer over an area of about 700 mm2, peaked at the injection hole, with a maximum thickness of about 900 nm and with a poloidal extend of about 20 mm was observed. It contained about 4-5 % of the total of injected Si atoms. In addition, about the same quantity of carbon was co-deposited, significantly increasing the C fluence arriving from the plasma during normal discharges.

Additional information

Authors: ESSER H G ET AL., Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vols. 220-222 (1995) pp. 457-461
Record Number: 199510888 / Last updated on: 1995-08-10
Original language: en
Available languages: en