NLC Luminosity as a Function of Beam Parameters
  Realistic calculation of NLC luminosity has been performed using particle tracking in DIMAD and beam-beam simulations in GUINEA-PIG code for various values of beam emittance, energy and beta functions at the Interaction Point (IP). Results of the simulations are compared with analytic luminosity calculations. The optimum range of IP beta functions for high luminosity was identified. 
Y. Nosochkov, P. Raimondi, T.O. Raubenheimer, A. Seryi