Method and apparatus for an improved bellows shield in a plasma processing system

A bellows shield for protecting a bellows on a substrate holder of a plasma processing system, comprising:

• a cylindrical wall comprising an inner surface, an outer surface, a first end, and a second end;
• wherein said first end comprises an attachment flange, said attachment flange comprising:
• an interior surface having a first surface extending radially inward from said inner surface of said cylindrical wall, and a mating surface extending radially inward from said first surface and axially recessed from said first surface, said mating surface being configured to mate with said substrate holder and having a groove therein further axially recessed from the mating surface and extending circumferentially around the mating surface, the groove being adjacent to the first surface
• an inner radial surface coupled to said mating surface
• an exterior surface coupled to said outer surface and said inner radial surface, said exterior surface comprising:
• a first exterior surface extending radially inward from said outer surface of said cylindrical wall,
• a second exterior surface axially protruded from said first exterior surface and extending radially inward from said first exterior surface, and
• a sidewall connecting said first exterior surface to said second exterior surface,
• wherein said attachment flange further comprises a plurality of fastening receptors coupled to said interior surface and said second exterior surface of said attachment flange and configured to receive fastening devices in order to couple said bellows shield to said substrate holder;
• and
• wherein said second end of said cylindrical wall comprises an end surface;
• and
• a protective barrier provided on a plurality of exposed surfaces of said bellows shield, wherein said exposed surfaces comprise said end surface of said second end, said outer surface of said cylindrical wall, and said exterior surface of said attachment flange of said first end, and said protective barrier is a coating which comprises yttrium or dysprosium and
• wherein at least a portion of said inner surface includes an anodization layer thereon and does not include said protective barrier thereon, and wherein at least a portion of said mating surface does not include an anodization layer thereon and does not include said protective barrier thereon.