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Relativistic magnetized jets, such as those from AGN, GRBs and XRBs, aresusceptible to current- and pressure-driven MHD instabilities that can lead toparticle acceleration and non-thermal radiation. Here we investigate thedevelopment of these instabilities through 3D kinetic simulations ofcylindrically symmetric equilibria involving toroidal magnetic fields withelectron-positron pair plasma. Generalizing recent treatments by Alves et al.(2018) and Davelaar et al. (2020), we consider a range of initial structures inwhich the force due to toroidal magnetic field is balanced by a combination offorces due to axial magnetic field and gas pressure. We argue that the particleenergy limit identified by Alves et al. (2018) is due to the finite duration ofthe fast magnetic dissipation phase. We find a rather minor role of electricfields parallel to the local magnetic fields in particle acceleration. In allinvestigated cases a kink mode arises in the central core region with a growthtimescale consistent with the predictions of linearized MHD models. In the caseof a gas-pressure-balanced (Z-pinch) profile, we identify a weak local pinchmode well outside the jet core. We argue that pressure-driven modes areimportant for relativistic jets, in regions where sufficient gas pressure isproduced by other dissipation mechanisms.

Kinetic Simulations of Instabilities and Particle Acceleration in Cylindrical Magnetized Relativistic Jets