Author: Meirielen Caetano de Sousa (meirielenso@gmail.com)
Last Update: 21/11/2017

Article: "Improving particle beam acceleration in plasmas", M. C. de Sousa and I. L. Caldas, Physics of Plasmas 25, 043110 (2018), doi: 10.1063/1.5017508, View online: https://doi.org/10.1063/1.5017508
Preprint available: https://arxiv.org/abs/1710.03879

This directory contains the codes used to generate the Figures of the article described above.
Codes are written in Mathematica, and a pdf version is also available.

Directory "Wave-Particle_Interactions\Charged_Particle_in_E_Wave_and_B_Field":
Figures 1 and 2 represent the phase spaces of the original system, i.e., a relativistic charged particle confined by an external uniform magnetic field, and interacting with a stationary electrostatic wave given as a series of periodic pulses propagating perpendicularly to the magnetic field.

Directory "Wave-Particle_Interactions\Charged_Particle_in_E_Wave_and_B_Field\Invariant_Robust_Barrier":
Figures 4 and 5 represent the phase spaces of the perturbed system, i.e., with the addition of a single perturbing invariant robust barrier to control chaos and improve particle acceleration from low initial energies.
Figure 3 presents the allowed positions for the perturbing robust barrier as a function of the wave amplitude for fixed values of wave period and wave number.