Restoring betatron phase coherence in a beam-loaded laser-wakefield accelerator
Accelerator Physics
2021-10-12 v2 Plasma Physics
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.
Keywords
Cite
@article{arxiv.1905.02240,
title = {Restoring betatron phase coherence in a beam-loaded laser-wakefield accelerator},
author = {A. Köhler and R. Pausch and M. Bussmann and J. P. Couperus Cabadağ and A. Debus and J. M. Krämer and S. Schöbel and O. Zarini and U. Schramm and A. Irman},
journal= {arXiv preprint arXiv:1905.02240},
year = {2021}
}