|CANDIDATE:||Stefano Romeo, La Sapienza, Rome|
|SUPERVISOR:||Prof. Massimo Ferrario|
We propose and numerically design a working point for beam driven plasma wakefield acceleration that allows to preserve the witness quality. This working point belongs to a new kind of scheme where a low density driver generates a wakefield in linear regime and the witness transverse evolution is dominated by the beam loading effect. We derived optimized conditions to prevent the phase space degradation by means of transverse envelope equation and a simplified model to describe the effect of the plasma wakefield on the longitudinal phase space.