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@unpublished{vafaei-najafabadi:napac2019-weyba4,
author = {N. Vafaei-Najafabadi and L.D. Amorim},
title = {{Beam Induced Ionization Injection of Shaped Electron Bunches}},
booktitle = {Proc. NAPAC'19},
language = {english},
intype = {presented at the},
series = {North American Particle Accelerator Conference},
number = {4},
venue = {Lansing, MI, USA},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {oct},
year = {2019},
note = {presented at NAPAC2019 in Lansing, MI, USA, unpublished},
abstract = {Particle-driven Plasma Wakefield Accelerators (PWFAs) are promising candidates for future free electron laser and collider applications. In PWFAs, energy is transferred from a relativistic drive beam to a trailing bunch in a plasma wake. One of the challenges of PWFAs is reducing energy spread of the beam from typically few percent to the required 0.1% range. This can be accomplished by generating a trailing bunch with a trapezoidal density profile, which will allow the PWFA to operate in the beam-loading regime, therefore circumventing the energy-spread growth of the trailing beam during acceleration. In this work we show how the Beam Induced Ionization Injection (BIII) technique can produce a trailing bunch of electrons with a trapezoidal shape suitable for beam-loading. In BIII, the trailing beam is created by ionization injection of an impurity due to the increased field of the beam during betatron oscillations. By tailoring the longitudinal profile of the impurity, we can shape the injected trailing electron bunch to reach the beam-loading regime. We will present results of numerical simulations done to model BIII shaped beams with the Particle In Cell code OSIRIS*.},
}