2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87372We describe a scheme for producing polarised positrons at the ILC from polarised X-rays created by Compton scattering of a few-GeV electron beam off a CO2 or YAG laser. This scheme is very energy effective using high finesse laser cavities in conjunction with an electron storage ring.Proposal submitted to the ILC workshop, Snowmass 2005. v2: note number addedAccelerator Physicstext