title: Solar concentrators with maximal concentration for cylindrical absorbers.
abstract: The differential equation is derived that describes the reflector of an ideal two-dimensional radiation concentrator with an absorber of arbitrary convex shape. For the special case of an absorber with circular cross section, the equation can be solved in closed form if suitable coordinates are used. The effect of absorption at the reflector is considered, and formulas are presented for determining the attenuation of radiation on its passage from aperture to absorber.
authors.forename: A
authors.initials: A
authors.lastname: Rabl