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A new electron acceleration mechanism is identified that develops when arelativistically intense laser irradiates the wedge of an over-dense plasma.This induces a diffracted electromagnetic wave with a significant longitudinalelectric field that accelerates electrons from the plasma over long distancesto relativistic energies. Well collimated, highly-charged (nC) electron buncheswith energies up to 100's MeV are obtained using a laser beam with $I\lambda_0^2 =3.5\times 10^{19}\,{\rm W \mu m^2/cm^2}$. Multi-dimensionalparticle-in-cell simulations, supported by a simple analytical model, confirmthe efficiency and robustness of the proposed acceleration scheme.

Electron acceleration by laser plasma wedge interaction