Concatenated Backward Ray Mapping on the Compound Parabolic ConcentratorWillem G.T. Jansen, Martijn J.H. Anthonissen, Jan H.M. ten Thije Boonkkamp and Wilbert L. IJzermanEPJ Web Conf., 287 (2023) 02006DOI: https://doi.org/10.1051/epjconf/202328702006