## Abstract

The two-stage line-to-point focus solar concentrator with tracking secondary optics is introduced. Its design aims to reduce the cost per ${\mathrm{m}}^{2}$ of collecting aperture by maintaining a one-axis tracking trough as the primary concentrator, while allowing the thermodynamic limit of concentration in 2D of $215\times $ to be significantly surpassed by the implementation of a tracking secondary stage. The limits of overall geometric concentration are found to exceed $4000\times $ when hollow secondary concentrators are used, and $6000\times $ when the receiver is immersed in a dielectric material of refractive index $n=1.5$. Three exemplary collectors, with geometric concentrations in the range of $500\u20131500\times $ are explored and their geometric performance is ascertained by Monte Carlo ray-tracing. The proposed solar concentrator design is well-suited for large-scale applications with discrete, flat receivers requiring concentration ratios in the range $500\u20132000\times $.

© 2013 Optical Society of America

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