First wall and limiter surfaces for plasma devices

Details First wall and limiter surfaces for plasma devices First wall and limiter surfaces for plasma devices

1981-06-01

1983-11-08

Cangialosi, Sal

Induced nuclear reactions: processes, systems, and elements

Nuclear fusion

Magnetic confinement of plasma

376150, G21B 100

Patent

active

044141769

ABSTRACT:
For a plasma device, a surface of a first wall or limiter with reduced loss of metal by erosion is provided by forming a monolayer of an alkali or alkaline earth metal on a substrate of a more negative metal. The surface exhibits a reduced loss of metal by erosion and particularly by sputtering and an increased secondary ion
eutral ratio resulting in a greater return of atoms escaping from the surface. In another aspect of the invention, the substrate includes a portion of the second metal and serves to replenish the surface layer with atoms of the second metal. In one process associated with self-generating desired surface, the metals as an alloy are selected to provide a first layer having a high concentration of the second metal in contrast to a very low concentration in the second layer and bulk to result in a surface with a monolayer of the second metal. When the combination of metals results in an intermetallic compound, selective removal of the first metal during an initial bombardment stage provides the surface layer with a predominance of the second metal.

REFERENCES:
patent: 3677326 (1972-07-01), Grosse
patent: 4260455 (1981-04-01), Moir
Intor, Zero Phase (12/79) IAEA, pp. 324-329, Vienna.
Journal of Nuclear Materials (76 & 77), (1978), pp. 199-201, 608-610, 612-613, McCraken et al., North Holland Pub. Co.
J. Nucl. Materials (85 & 86), (1979), pp. 1179-1833, Krauss et al. (I).
Surface Science 90, (1979), pp. 564-578, Krauss et al. (II).

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