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We present a new magnetic field generation mechanism in underdense plasmasdriven by the beating of two, co-propagating, Laguerre-Gaussian (LG) orbitalangular momentum (OAM) laser pulses with different frequencies and alsodifferent twist indices. The resulting twisted ponderomotive force drives up anelectron plasma wave with a helical rotating structure. To second order, thereis a nonlinear rotating current leading to the onset of an intense, staticaxial magnetic field, which persists over a long time in the plasma (ps scale)after the laser pulses have passed by. The results are confirmed inthree-dimensional particle-in-cell simulations and also theoretical analysis.For the case of 300 fs duration, 3.8x10^17 W/cm^2 peak laser intensity weobserve magnetic field of up to 0.4 MG. This new method of magnetic fieldcreation may find applications in charged beam collimation and controlledfusion.

Magnetic field generation in plasma waves driven by co-propagating intense twisted lasers