High quality electron bunches for a multistage GeV accelerator with resonant multipulse ionization injection

Year: 2019

Authors: Tomassini P., Terzani D., Labate L., Toci G., Chance A., Nghiem PAP., Gizzi LA.

Autors Affiliation: CNR, Intense Laser Irradiat Lab, INO, Via Moruzzi 1, I-56124 Pisa, Italy; INFN, Sect Pisa, Largo Bruno Pontecono 3, I-56127 Pisa, Italy; CNR, INO, Largo Enrico Fermi 2, I-56125 Florence, Italy; Univ Paris Saclay, Ctr Saclay, CEA Irfu, F-91191 Gif Sur Yvette, France

Abstract: Laser wakefield acceleration of GeV electrons is becoming a mature technique, so that a reliable accelerator delivering stable beams to users communities can now be considered. In such a context, two plasma stages, one injector and one booster stage, offer a flexible solution for optimization. For the injector we consider here the resonant multipulse ionization injection (ReMPI) that can be optimized to generate electron bunches with high enough quality to be efficiently transported to the second stage. In order to better control the beam-loading effect and optimize the beam manipulation after the plasma downramp, a quasiround beam is preferable. In this respect, we present analytical and particle-in-cell results concerning the tunnel-ionization process in presence of two, orthogonally polarized, laser pulses with different wavelengths. We also show, by means of hybrid fluid/PIC numerical simulations, that a stable working point with the ReMPI injector exists at 32 pC, 4 kA peak current, with mean energy of 150 MeV, energy spread of 1.65% rms, normalized emittance epsilon(n) = 0.23 mu m and divergence of 0.6 mrad. The scheme relies on a 150 TW Ti:Sa laser modified to achieve a four-pulses driver train and a third harmonics ionization pulse.


Volume: 22 (11)      Pages from: 111302-1  to: 111302-12

More Information: The research leading to these results has received funding from the EU Horizon 2020 Research and Innovation Program under Grant Agreement No. 653782 EuPRAXIA. This project has received financial support from the CNR funded Italian research Network ELI-Italy. We acknowledge the S. Sinigardi grant IsB18_ALaRe and the P. Londrillo grant IsC65_ENV-LWFA at CINECA under the ISCRA initiative for the HPC resources. The authors very much appreciate the support by P. Londrillo (INAF, Italy) and M.Kirchen (DESY, Deutschland) for their help with ALaDyn and FB-PIC codes.
KeyWords: Advanced accelerator test facilities, Laser wakefield acceleration, Particle acceleration in plasmas, Plasma waves, Laser-plasma interactions
DOI: 10.1103/PhysRevAccelBeams.22.111302

Citations: 13
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