Benchmarking collective effects of electron interactions in a wiggler with OPAL-FEL. - Arnau Albà; Jimin Seok; Andreas Adelmann; Scott Doran; Gwanghui Ha; Soonhong Lee; Yinghu Piao; John Power; Maofei Qian; Eric Wisniewski; Joseph Xu; Alexander Zholents (Comput. Phys. Commun., 2022)