Patent ID: 7959776

Claim:
A sputtering target comprising: a backing plate comprising at least one coolant inlet and at least one coolant outlet; a supporting plate positioned substantially abutting the backing plate forming a transition area therebetween the supporting plate and the backing plate, wherein the supporting plate defines a plurality of boreholes, whereby at least one borehole substantially aligns with a respective at least one coolant inlet and at least one borehole substantially aligns with a respective at least one coolant outlet; a plurality of first sealing rings therebetween the backing plate and the supporting plate, substantially coaxial with and surrounding each of the at least one coolant inlets and at least one coolant outlets, substantially sealing the boreholes from the transition area; and a plurality of second sealing rings therebetween the backing plate and the supporting plate, each second sealing ring being substantially coaxial with, substantially surrounding, and spaced therefrom each of the first sealing rings, thereby forming an annular space between each of the first sealing rings and each of the second sealing rings, wherein the supporting plate further defines a ventilation borehole substantially therethrough the supporting plate, wherein the annular space is in communication with the atmosphere via the ventilation borehole.