EXCITATION OF WAKE-FIELDS IN AN ELECTRON-POSITRON PLASMA BY AN ULTRARELATIVISTIC PROTON-BEAM

The excitation of one-dimensional nonlinear relativistic wake-waves in an electron-positron plasma by an ultrarelativistic proton beam is di scussed on the basis of a self-consistent analytical model. It is show n that in contrast to a common plasma with heavy ions these waves are have an oscillation character at any ratio of the beam density and tha t of the electron-positron plasma.