Study of external electron beam injection into proton driven plasma wakefields for AWAKE Run2

Abstract

We describe an external electron injection scheme for the AWAKE experiment. We use scattering in two foils, that are necessary as vacuum window and laser beam dump, to decrease the betatron function of the incoming electron beam for injection and matching into plasma wakefields driven by a self-modulated proton bunch. We show that, for a total aluminum foil thickness of $\sim 280\mu$m, multiple Coulomb scattering increases the beam emittance by a factor of $\sim 10$ and decreases the betatron function by a factor of $\sim 3$. The plasma in the accelerator is created by a ionizing laser pulse, counter-propagating with respect to the electron beam. This allows for the electron bunch to enter the plasma through an "infinitely" sharp vapor-plasma boundary, away from the foils.

References in corpus (5)

• Acceleration of electrons in the plasma wakefield of a proton bunch
• Experimental observation of proton bunch modulation in a plasma, at varying plasma densities
• Experimental observation of plasma wakefield growth driven by the seeded self-modulation of a proton bunch
• AWAKE readiness for the study of the seeded self-modulation of a 400\,GeV proton bunch
• Emittance preservation of an electron beam in a loaded quasi-linear plasma wakefield

Cited by in corpus (1)

• Proton beam self-modulation seeded by electron bunch in plasma with density ramp