title: Optical design of a 4-off-axis-unit Cassegrain ultra-high concentrator photovoltaics module with a central receiver.
abstract: Ultra-high concentrator photovoltaics (UHCPV), with concentrations higher than 1000 suns, have been pointed out by different authors as having great potential for being a cost-effective PV technology. This Letter presents a UHCPV Cassegrain-based optical design in which the sunrays are concentrated and sent from four different and independent paraboloid-hyperboloid pairs optical units onto a single central receiver. The optical design proposed has the main advantage of the achievement of ultra-high concentration ratios using relative small mirrors with similar performance values of efficiency, acceptance angle, and irradiance uniformity to other designs.
authors.forename: Juan P
authors.initials: JP
authors.lastname: Ferrer-Rodríguez
authors.forename: Eduardo F
authors.initials: EF
authors.lastname: Fernández
authors.forename: Florencia
authors.initials: F
authors.lastname: Almonacid
authors.forename: Pedro
authors.initials: P
authors.lastname: Pérez-Higueras