Parametric study of high-energy ring-shaped electron beams from a laser wakefield accelerator - Maitrallain, A; Brunetti, E; Streeter, MJ; Kettle, B; Spesyvtsev, R; Vieux, G; Shahzad, M; Ersfeld, B; Yoffe, SR; Kornaszewski, A; Finlay, O; Ma, Y; et al. (NEW JOURNAL OF PHYSICS, 2022)