@article {Keefe:October, 2003:0950-0340:2443, author = "Keefe, Peter D.", title = "Coherent magneto-caloric effect superconductive heat engine process cycle", journal = "Journal of Modern Optics", volume = "50", year = "October, 2003", abstract = "A heat engine process cycle is proposed in which an armature, composed of a type I superconductor material, is magnetocalorically and magnetodynamically processed in magnetic field-temperature (H-T) space. Provided that the diameter d of the armature is defined by ξ(T) ≥ d ≥ 5λ(T), then a coherent magnetocaloric magnetization process is predicted which refrigerates the armature from a cycle high temperature T1 to a cycle low temperature T2, and a subsequent coherent magnetocaloric demagnetization process is predicted which heats the armature from T2 to an intermediate temperature T3, where T3<T2. A heat influx from an external high-temperature heat reservoir is required to achieve T1 and thereby to complete the cycle. As the temperature changes, the magnetic field is varied between a cycle low magnetic field H1 at T1 and a cycle high magnetic field H2 at T2, where the magnetodynamic work output is provided as the magnetic field is decreased from H2 to H1.", pages = "2443-2454(12)", url = "http://www.ingentaconnect.com/content/tandf/tmop/2003/00000050/F0030015/art00015" doi = "doi:10.1080/0950034032000120894" }