Wake fields effects in dielectric capillary

Plasma wake-field acceleration experiments are performed at the SPARC_LAB test facility by using a gas-filled capillary plasma source composed of a dielectric capillary. The electron can reach GeV energy in a fewcentimeters, with an accelerating gradient orders of magnitude larger than provided by conventional techniques.In this acceleration scheme, wake fields produced by passing electron beams through dielectric structures candetermine a strong beam instability that represents an important hurdle towards the capability to focus high-current electron beams in the transverse plane. For these reasons, the estimation of the transverse wake-fieldamplitudes assumes a fundamental role in the implementation of the plasma wake-field acceleration. In thiswork, it presented a study to investigate which parameters affect the wake-field formation inside a cylindricaldielectric structure, both the capillary dimensions and the beam parameters, and it is introduced a quantitativeevaluation of the longitudinal and transverse electric fields.