2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161477The importance of collimator R&D with test beam facilities is demonstrated with the example of ILC collimator studies at SLAC End Station A. Related LHC collimator aspects and longer term plans are addressed.8 pages, 10 figures. presented at IDTB07, FermilabInstrumentation and DetectorsAccelerator Physicstext