2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182146This paper reports results on a detailed study of charge collection and signal-to-noise performance of CMOS monolithic pixel sensors before and after back-thinning and their application in a pixel beam telescope for the ALS 1.5 GeV $e^-$ beam test facility.6 pages, one figure, to appear on the proceedings of the the Sixth International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Carmel, CA, September, 2006Instrumentation and Detectorstext