Patent ID: 8922308

Claim:
A persistent current switch for alternatingly switching between a first mode and a second mode, comprising: a vacuum chamber; a cooling unit disposed within the vacuum chamber and configured to circulate a coolant between a first layer and a second layer of the cooling unit, wherein the cooling unit comprises: an inlet coupled to a coolant reservoir and configured to receive the coolant from the coolant reservoir; an outlet coupled to the coolant reservoir and configured to convey evaporated coolant from the cooling unit to the coolant reservoir; a winding unit disposed on at least one of the first layer and the second layer of the cooling unit and configured to switch the persistent current switch from the first mode to the second mode when a temperature associated with the winding unit is below a threshold temperature; a heating unit thermally coupled to the winding unit and configured to enhance the temperature of the winding unit above the threshold temperature to transition the persistent current switch from the second mode to the first mode, wherein the inlet of the cooling unit is configured to receive the coolant from the coolant reservoir when the heating unit is de-energized and at least a portion of the coolant is evaporated, and wherein the outlet of the cooling unit is configured to convey the evaporated coolant to the coolant reservoir when the heating unit is energized; and a filler material disposed within an inner circumference of the second layer of the cooling unit, wherein the filler material is configured to stabilize the temperature of the winding unit.