Title: Plasma-based wakefield accelerators as sources of axion-like particles,
Abstract: We estimate the average flux density of minimally-coupled axion-like
particles generated by a laser-driven plasma wakefield propagating along a
constant strong magnetic field. Our calculations suggest that a terrestrial
source based on this approach could generate a pulse of axion-like particles
whose flux density is comparable to that of solar axion-like particles at
Earth. This mechanism is optimal for axion-like particles with mass in the
range of interest of contemporary experiments designed to detect dark matter
using microwave cavities.