2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219654At the International Linear Collider (ILC), measurement of the beam profile at the interaction point (IP) is a key issue to achieve high luminosity. We studied the beam size measurement by combination of Pair Monitor and BeamCal. We obtained measurement accuracies of 2.7%, and 6.6% for the horizontal, and vertical beam sizes, respectively, for 50 bunch crossings.4 pages, 3 figures, Proceedings of LCWS08Instrumentation and Detectorstext