an apparatus for removing heat from a turbine includes a stator having a cavity and a first plenum and a second plenum inside the cavity . the second plenum is connected to the first plenum and surrounds the first plenum inside the cavity . a refrigerant flows through the first plenum and the second plenum to remove heat from the stator . a method for cooling a turbine includes forming a cavity in a component to be cooled , installing a first plenum inside the cavity , and installing a second plenum inside the cavity . the method further includes connecting the second plenum to the first plenum , surrounding the first plenum with the second plenum inside the cavity , and flowing a refrigerant through the first plenum and the second plenum to cool the component .