Restoring betatron phase coherence in a beam-loaded laser-wakefield accelerator
arXiv:1905.02240 · doi:10.1103/PhysRevAccelBeams.24.091302
Abstract
Matched beam loading in laser wakefield acceleration (LWFA), characterizing the state of flattening of the acceleration electric field along the bunch, leads to the minimization of energy spread at high bunch charges. Here, we demonstrate by independently controlling injected charge and acceleration gradients, using the self-truncated ionization injection scheme, that minimal energy spread coincides with a reduction of the normalized beam divergence. With the simultaneous confirmation of a constant beam radius at the plasma exit, deduced from betatron radiation spectroscopy, we attribute this effect to the reduction of chromatic betatron decoherence. Thus, beam loaded LWFA enables highest longitudinal and transverse phase space densities.
References in corpus (10)
- Generating multi-GeV electron bunches using single stage laser wakefield acceleration in a 3D nonlinear regime
- Femtosecond x rays from laser-plasma accelerators
- A spectral, quasi-cylindrical and dispersion-free Particle-In-Cell algorithm
- Beam loading in the nonlinear regime of plasma-based acceleration
- Automation and control of laser wakefield accelerators using Bayesian optimisation
- Physics of nanocoulomb-class electron beams in laser-plasma wakefields
- Demonstration of a compact plasma accelerator powered by laser-accelerated electron beams
- Self-truncated ionization injection and consequent monoenergetic electron bunches in laser wakefield acceleration
- Phase Space Dynamics of Ionization Injection in Plasma Based Accelerators
- High-Quality Electron Beams from Beam-Driven Plasma Accelerators by Wakefield-Induced Ionization Injection