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In an electron wakefield accelerator, an intense laser pulse or chargedparticle beam excites plasma waves. Under proper conditions, electrons from thebackground plasma are trapped in the plasma wave and accelerated toultra-relativistic velocities. We present recent results from aproof-of-principle wakefield acceleration experiment that reveal a uniquesynergy between a laser-driven and particle-driven accelerator: a high-chargelaser-wakefield accelerated electron bunch can drive its own wakefield whilesimultaneously drawing energy from the laser pulse via direct laseracceleration. This process continues to accelerate electrons beyond the usualdecelerating phase of the wakefield, thus reaching much higher energies. Wefind that the 10-centimeter-long nanoparticle-assisted wakefield acceleratorcan generate 340 pC, 10.4+-0.6 GeV electron bunches with 3.4 GeV RMS convolvedenergy spread and 0.9 mrad RMS divergence. It can also produce bunches withlower energy, a few percent energy spread, and a higher charge. Thissynergistic mechanism and the simplicity of the experimental setup represent astep closer to compact tabletop particle accelerators suitable for applicationsrequiring high charge at high energies, such as free electron lasers orradiation sources producing muon beams.

High-charge 10 GeV electron acceleration in a 10 cm nanoparticle-assisted hybrid wakefield accelerator