The Boc Group, Inc.

Varian Associates, Inc.

John R Porter

Peter A Sieck

Christopher M Flegal

A rotating cylindrical sputtering target surface as part of a magnetron has cylindrical shields adjacent each end of the target that are shaped at their respective inner edges to maximize etching and to prevent condensation and subsequent arcing that undesirably occurs when certain materials, particularly dielectrics, are being sputtered. If two or more rotating targets are employed in a single magnetron system, each is similarly shielded. In an alternative form, the target is provided with a single cylindrical shield that is cut away for a significant portion of the distance around the cylinder to provide an opening through which a sputtering region of the target is accessible, while maintaining shielding of the target end regions. This alternative single shield is similarly shaped at portions of its inner edges adjacent to the opening to maximize etching and to prevent undesired condensation and subsequent arcing. The preferred shield structure is rotatable in order to allow the position of the sputtering activity to be selected.

Cylindrical magnetron shield structure

A two-stage cryosorption pump has a first stage at a higher temperature and a second stage at a lower temperature. Sorption surfaces of reticulated vitreous carbon formed on the second stage have high rigidity and exceptionally high void volume.

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Napa, CA, United States of America

John R Porter