Study of the NLC Linac Optics Compatible with a Low Energy Scenario
  We 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. 
Y. Nosochkov and T.O. Raubenheimer