2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/84605We explore the NLC linac optics compatible with a low energy scenario where initially only part of the full linac is installed. Optics modification suitable for a low energy beam running and upgrade to the nominal energy is discussed. Linac parameters and beam tolerances in the modified lattice are compared to the nominal design.7 pages, 5 figuresAccelerator Physicstext