CNGS: Update on secondary beam layout

The conceptual technical design of the CNGS (CERN neutrino beam to Gran Sasso) facility has been presented in the report CERN 98-02 / INFN-AE/98-05. An updated beam design, in particular a revised neutrino beam optimised for nu_mu - nu_tau appearance experiments, has been described in an addendum (CERN-SL/99-034(DI) / INFN-AE/99-05). In this note, a slightly modified version of the CNGS secondary beam and an update of the parameter lists is given. The changes aim at technical improvements in the CNGS secondary beam components, without compromising on the expected lifetime of the components. A slight increase of expected nu_tau charged current events at Gran Sasso has been achieved in the simulations.