Patent ID: 8273222

Claim:
A method for depositing coatings on the interior surface of a workpiece with sputtering material in an ion plasma environment comprising: providing a magnetron within said workpiece, wherein said magnetron has a length and includes a core cooling system surrounded by a magnet assembly and a target material, said target material having a surface capable of providing a source of sputtering material wherein said magnetron assembly is capable of providing a negative bias and drawing ions from the plasma to said target material resulting in ion sputtering; providing an RF plasma generation assembly including an RF antenna coil capable of providing an RF plasma and drawing ions to one of said workpiece surface and said target material surface, wherein at least a portion of the RF antenna coil is wrapped around said magnetron along the length of said magnetron and positioned between said magnetron and said workpiece within a region bound by said magnetron and workpiece; and applying power to the RF generation assembly generating RF plasma and biasing said workpiece and magnetron assembly and ion-cleaning one of said target material and said workpiece with said RF plasma wherein said workpiece is biased up to 150 volts and said magnetron assembly is biased at 30-120 volts during said ion-cleaning.