2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180838A low background Micromegas detector has been operating in the CAST experiment at CERN for the search of solar axions during the first phase of the experiment (2002-2004). The detector, made out of low radioactivity materials, operated efficiently and achieved a very low level of background rejection (5 x 10^-5 counts/keV/cm^2/s) without shielding.13 pages, 12 figures and images, submitted to New Journal ofInstrumentation and Detectorstext