Sputter gun shutter

A sputter gun comprising:

• a magnetron;
• a target disposed adjacent to the magnetron, the target having a central axis and a periphery;
• a grounded shield having a lower edge, the grounded shield disposed around the periphery of the target, wherein the grounded shield further comprises a first lip formed at the lower edge of the grounded shield, wherein the first lip extends in a direction toward the central axis of the target;
• and
• a shutter, the shutter comprising:
• a bottom plate having a planar surface, a peripheral edge, and a central axis, wherein the central axis is perpendicular to the planar surface;
• a side wall having an upper edge and a lower edge, wherein the lower edge of the side wall is attached at the peripheral edge of the bottom plate;
• and
• a second lip formed at the upper edge of the side wall, wherein the lip extends toward the central axis of the bottom plate.