Increasing energy coupling into plasma waves by tailoring the laser radial focal spot distribution in a laser wakefield accelerator - Genoud,G; Bloom,MS; Vieira,J; Burza,M; Najmudin,Z; Persson,A; Silva,LO; Svensson,K; Wahlstrom,C-G; Mangles,SPD (PHYSICS OF PLASMAS, 2013)