Ideal second stages in tandem with parabolic concentrators.
Expressions for the concentration capability of parabolic reflectors are derived and extended to include additional ideal second-stage concentration. The ultimate concentration of a parabolic reflector (primary) alone is shown to achieve one-half of the ideal limit in 2-D geometry; the respective two-stage configuration is shown to approach the ideal limit itself at large f/Nos.
Kritchman
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EM