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Laser wakefield acceleration of electrons usually offers an axisymmetryaround the laser propagation axis. Thus, the accelerating electrons that arefocused on axis often execute small transverse oscillations. In this Article,we propose a simple scheme to break this symmetry, which enhances thetransverse wiggling of electrons and boosts the betatron radiation emission.Through 3D particle-in-cell simulations, we show that sending the laser with asmall angle of incidence on a transverse plasma density gradient generates anasymmetric wakefield. It first provokes injection and then increases thewiggling of the electrons through the transverse shifting of the wakefield axiswhich occurs when the laser pulse leaves the gradient. Consequently, we showthat the radiated energy per unit of charge can increase by a factor $>20$ whenusing this scheme, and that the critical energy of the radiation quintuplescompared with a reference case without the transverse density gradient.

Enhancement of betatron X-rays through asymmetric laser wakefield generated in transverse density gradients