2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/168736Via systematic numerical simulation we found that the recently propose 'Pancake' scheme [O. J. Luiten et al., Phys. Rev. Lett. 93, 094802 (2004)] does not generate a beam desired for low emittance, even when compared with the more traditionally accepted cylindrical beam geometry.2 pages, 2 figuresAccelerator Physicstext