Abstract
The enhancement of trapping and the optimization of beam quality are two key issues of Laser Wakefield Acceleration (LWFA). The effect of a homogenous constant magnetic field B0, parallel to the direction of propagation of the pump pulse, is studied in the blowout regime via 2Dx3Dv Particle-In-Cell simulations. Electrons are injected into the wake using a counter-propagating low amplitude laser. Transverse currents are generated at the rim of the bubble, which results in the amplification of the B0 field at the rear of the bubble. Therefore the dynamics of the beam is modified, the main effect is the reduction of the transverse emittance when B0 is raised. Depending on beam loading effects the low energy tail, observed in the non-magnetized case, can be suppressed when B0 is applied, which provides a mono-energetic beam.
Highlights
In Laser Wake-Field Acceleration (LWFA) [1,2,3,4], a laser creates a plasma wave wakefield with a phase velocity close to the speed of light (c)
We focus on wakefield acceleration in the presence of an external, initially homogenous, magnetic field and we study its influence through PIC simulations
This paper has been devoted to studying the influence of an external magnetic field on the wakefield acceleration process, within the colliding pulse scheme
Summary
In Laser Wake-Field Acceleration (LWFA) [1,2,3,4], a laser creates a plasma wave wakefield with a phase velocity close to the speed of light (c). An electron injected in such a wave gains energy from the longitudinal component of the electric field, as long as the pump pulse is not depleted and the dephasing length is not reached. These wakefields have ideal properties for accelerating electrons. This is the idea of the bubble regime [7,8] For these conditions, a hundred-joule class laser would have an intensity of the order ~1021 W cm 2. A hundred-joule class laser would have an intensity of the order ~1021 W cm 2 In this regime, the electrons are continuously injected, this results in tremendous beam loading and the loaded wake is noisy.
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