Concatenated Backward Ray Mapping on the Compound Parabolic Concentrator Willem G.T. Jansen, Martijn J.H. Anthonissen, Jan H.M. ten Thije Boonkkamp and Wilbert L. IJzerman EPJ Web Conf., 287 (2023) 02006 Published online: 18 October 2023 DOI: 10.1051/epjconf/202328702006