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A high-intensity laser beam propagating through a dense plasma drives astrong current that robustly sustains a strong quasi-static Mega Tesla-levelazimuthal magnetic field. The transverse laser field efficiently accelerateselectrons in the presence of such a field that confines the transverse motionand deflects the electrons in the forward direction, establishing the novelforward-sliding swing acceleration mechanism. Its advantage is a thresholdrather than resonant behavior, accelerating electrons to high energies forsufficiently strong laser-driven currents. We study the electrons' dynamics bya simplified model analytically, specifically deriving simple relations betweenthe current, the particles' initial transverse momenta and the laser's fieldstrength classifying the energy gain. We confirm the model's predictions bynumerical simulations, indicating Mega ampere-level threshold currents andenergy gains two orders of magnitude higher than achievable without themagnetic field.

Forward sliding-swing acceleration: electron acceleration by high-intensity lasers in strong plasma magnetic fields