Abstract
V-Code, based on the Ensemble Model [1], was elaborated as fast and efficient tool for the beam dynamics simulation. The Ensemble Model equations are derived from Vlasov equation and involve the second order moments of the distribution function. The structure of accelerators and the features of the Ensemble Model determine the choice of the object-oriented approach for the code elaboration. Such approach gives an essential advantage in further extension, as the code can be improved continuously by introducing new element classes. The Ensemble Model is valid for any energy range and the V-Code can simulate the entire accelerator. The present beam line database has been developed for the TESLA Test Facility (TTF DESY) accelerator component description. The results of the beam dynamics on-line simulation for TTF injector are presented.