The United States of America As Represented by the Administrator of the

United States of America As Represented by the Administrator of Nasa

Kenneth A Jensen

Arthur N Curren

Robert F Roman

The present invention is directed to a method and apparatus for producing a highly-textured surface on a copper substrate with only extremely small amounts of texture-inducing seeding or masking material. The texture-inducing seeding material is delivered to the copper substrate electrically switching the seeding material in and out of a circuit loop.

Substrate with low secondary emissions

Method and apparatus for producing a substrate with low secondary

A very thin layer of highly textured carbon is applied to a copper surface by a triode sputtering process. A carbon target 10 and a copper substrate 12 are simultaneously exposed to an argon plasma 14 in a vacuum chamber. The resulting carbon surface is characterized by a dense, random array of needle-like spires or peaks which extend perpendicularly from the copper surface. The coated copper is especially useful for electrode plates in multistage depressed collectors.

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Bay Village, OH, United States of America

Kenneth A Jensen