Hybrid coils having an improved heat transfer capability

A hybrid coil ( 11 ) employs a wire layer ( 22 ), a wire layer ( 23 ) adjacent the wire layer ( 22 ), and a wire layer ( 24 ) adjacent the wire layer ( 23 ). The hybrid coil ( 11 ) further employs a thermal conductive insulator ( 42 ) physically disposed within a space between the wire layer ( 22 ) and the wire layer ( 23 ), and a thermal conductive insulator ( 43 ) physically disposed within a space between the wire layer ( 23 ) and the wire layer ( 24 ). The thermal conductive insulators ( 42, 43 ) can be electrically disconnected, and each thermal conductive insulator ( 42, 43 ) can consists of an aluminum foil ( 42 a, 43 a) having oxide layers ( 42 b, 43 b, 42 c, 43 c) on each side thereof.