Patent ID: 7982197

Claim:
Ion implantation apparatus comprising: a vacuum chamber with a chamber wall and a detachable cooling fluid connection in said vacuum, said detachable fluid connection having a seal structure to prevent cooling fluid leaking into said vacuum chamber, and said seal structure comprising first and second seals in tandem forming an intermediate chamber between said tandem seals; a venting conduit within said vacuum chamber connecting said intermediate chamber through said chamber wall to the exterior of the vacuum chamber; a workpiece support wheel mounted for rotation in said vacuum chamber about an axis, said support wheel having a plurality of said workpiece supports located at a common radius around a periphery of said wheel, whereby rotation of said wheel passes workpieces on said supports successively through an implant location along a circular scan path defined by said wheel periphery, wherein said workpiece support wheel has a hub mounted for rotation about said axis; a continuous peripheral annulus providing said workpiece supports; and a plurality of spokes providing support for said annulus centered on said hub in a wheel plane normal to said axis, wherein at least some of said spokes are tubular, and said at least one fluid conducting member is provided by said tubular spokes to carry said cooling fluid between said hub and said peripheral annulus for cooling said workpieces.