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When studying the interaction of matter with extreme fields usingmultipetawatt lasers, there are two limiting cases maximizing either theelectric field or the magnetic field. Here, the main attention is paid to theoptimal configuration of laser beams in the form of an m-dipole wave, whichmaximizes the magnetic field, and the corresponding production of pair plasmavia a QED cascade using 10-PW class lasers. We show that the threshold ofvacuum breakdown with respect to avalanche-like pair generation is about 10 PW.Using 3D PIC modeling in the specified fields, we go deeper into the physics ofvacuum breakdown, i.e. we examined in detail the individual trajectories ofparticles produced in inhomogeneous electric and magnetic fields, thespace-time distributions of pair densities on the avalanche stage, and theenergy distributions of charged particles and gamma photons. The forming plasmastructures represent concentric rings around the central magnetic axis, whichcan result in significant change of laser-plasma interaction in comparison withthe case of an e-dipole wave.

Dense e$^-$e$^+$ plasma formation in magnetic dipole wave: vacuum breakdown by 10-PW class lasers