A cathode sputtering source comprises a heat sink comprising a substantially circularly-shaped planar disk formed of an electrically and thermally conductive material, with a circumferentially extending edge connecting first and second opposing major surfaces, the first major surface including a plurality of radially extending, recessed gas supply channels formed therein and extending from a central recess formed in the first major surface to the circumferentially extending edge; the second major surface including a gas inlet formed adjacent the circumferentially extending edge; a gas flow channel formed in the interior of the disk fluidly connects the gas inlet and central recess; and a substantially circular disk-shaped sputtering target is mounted on the first major surface, whereby gas supplied to the gas inlet is substantially uniformly distributed around the entirety of the circumferentially extending edge of the heat sink. Preferred embodiments include a rotatable magnetron magnet assembly positioned behind the heat sink.

 
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> Preconditioning an elastomeric stop member for use as a reference position

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