A gas turbine engine high pressure compressor comprising a case, a plurality of blades, a blade outer air seal, and a case clearance control system, the case clearance control system comprising: a blade outer air seal support structure configured to support said blade outer air seal that interacts with said blades to maintain a tip clearance between said blade outer air seal and said blades, said blade outer air seal support structure having a plurality of protrusions extending radially from the blade outer air seal support structure opposite said blade outer air seal; a thermal control ring coupled to said blade outer air seal support structure, said thermal control ring including a plurality of receivers configured to couple with said plurality of protrusions, said protrusions are formed spaced apart around a circumference of said blade outer air seal support structure; a thermal break formed between said plurality of protrusions and said plurality of receivers, said thermal break configured to control heat transfer between said blade outer air seal support structure and said thermal control ring; and a plurality of flow passages formed between said blade outer air seal support structure, said thermal control ring and said plurality of protrusions, said plurality of flow passages configured to allow cooling air flow to thermally condition said thermal control ring and maintain thermal control ring dimensions to control expansion and contraction of said blade outer air seal support structure relative to said tip clearance, wherein said protrusions comprise a base portion proximate said blade outer air seal support structure and an end portion radially distal from said base portion, and characterized in that: said end portion and said receiver are configured in a shape of a dovetail fitting that maintains said thermal break; and in that said end portion is shaped as a bulbous form that interlocks with said receiver, wherein said receiver corresponds with the shape of said end portion, with a larger dimension to allow for a loose fit between said end portion and said receiver, such that said loose fit promotes said thermal break in the form of an air gap and allows for the movement of said cooling air to pass over said end portion and through said receiver. a blade outer air seal support structure configured to support said blade outer air seal that interacts with said blades to maintain a tip clearance between said blade outer air seal and said blades, said blade outer air seal support structure having a plurality of protrusions extending radially from the blade outer air seal support structure opposite said blade outer air seal; a thermal control ring coupled to said blade outer air seal support structure, said thermal control ring including a plurality of receivers configured to couple with said plurality of protrusions, said protrusions are formed spaced apart around a circumference of said blade outer air seal support structure; a thermal break formed between said plurality of protrusions and said plurality of receivers, said thermal break configured to control heat transfer between said blade outer air seal support structure and said thermal control ring; and a plurality of flow passages formed between said blade outer air seal support structure, said thermal control ring and said plurality of protrusions, said plurality of flow passages configured to allow cooling air flow to thermally condition said thermal control ring and maintain thermal control ring dimensions to control expansion and contraction of said blade outer air seal support structure relative to said tip clearance, wherein said protrusions comprise a base portion proximate said blade outer air seal support structure and an end portion radially distal from said base portion, and characterized in that: said end portion and said receiver are configured in a shape of a dovetail fitting that maintains said thermal break; and in that said end portion is shaped as a bulbous form that interlocks with said receiver, wherein said receiver corresponds with the shape of said end portion, with a larger dimension to allow for a loose fit between said end portion and said receiver, such that said loose fit promotes said thermal break in the form of an air gap and allows for the movement of said cooling air to pass over said end portion and through said receiver. said end portion and said receiver are configured in a shape of a dovetail fitting that maintains said thermal break; and in that said end portion is shaped as a bulbous form that interlocks with said receiver, wherein said receiver corresponds with the shape of said end portion, with a larger dimension to allow for a loose fit between said end portion and said receiver, such that said loose fit promotes said thermal break in the form of an air gap and allows for the movement of said cooling air to pass over said end portion and through said receiver.