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One of the key questions in the study of relativistic jets is how magneticreconnection occurs and whether it can effectively accelerate electrons in thejet. We performed 3D particle-in-cell (PIC) simulations of a relativisticelectron-proton jet of relatively large radius that carries a helical magneticfield. We focussed our investigation on the interaction between the jet and theambient plasma and explore how the helical magnetic field affects theexcitation of kinetic instabilities such as the Weibel instability (WI), thekinetic Kelvin-Helmholtz instability (kKHI), and the mushroom instability (MI).In our simulations these kinetic instabilities are indeed excited, andparticles are accelerated. At the linear stage we observe recollimation shocksnear the center of the jet. As the electron-proton jet evolves into the deepnonlinear stage, the helical magnetic field becomes untangled due toreconnection-like phenomena, and electrons are repeatedly accelerated as theyencounter magnetic-reconnection events in the turbulent magnetic field.

Rapid Particle Acceleration due to Recollimation Shocks and Turbulent Magnetic Fields in Injected Jets with Helical Magnetic Fields