Magnetic Field Generation in Core-Sheath Jets via the Kinetic Kelvin-Helmholtz Instability

Abstract

We have investigated magnetic field generation in velocity shears via the kinetic Kelvin-Helmholtz instability (kKHI) using a relativistic plasma jet core and stationary plasma sheath. Our three-dimensional particle-in-cell simulations consider plasma jet cores with Lorentz factors of 1.5, 5, and 15 for both electron-proton and electron-positron plasmas. For electron-proton plasmas we find generation of strong large-scale DC currents and magnetic fields which extend over the entire shear-surface and reach thicknesses of a few tens of electron skin depths. For electron-positron plasmas we find generation of alternating currents and magnetic fields. Jet and sheath plasmas are accelerated across the shear surface in the strong magnetic fields generated by the kKHI. The mixing of jet and sheath plasmas generates transverse structure similar to that produced by the Weibel instability.

28 pages, 12 figures, in press, ApJ, September 10, 2014

References in corpus (9)

• Particle acceleration in relativistic collisionless shocks: Fermi process at last?
• On the structure of relativistic collisionless shocks in electron-ion plasmas
• Long Term Evolution of Magnetic Turbulence in Relativistic Collisionless Shocks: Electron-Positron Plasmas
• 3D Relativistic Magnetohydrodynamic Simulations of Magnetized Spine-Sheath Relativistic Jets
• Three-Dimensional Relativistic MHD Simulations of the Kelvin-Helmholtz Instability: Magnetic Field Amplification by a Turbulent Dynamo
• Electron-scale shear instabilities: magnetic field generation and particle acceleration in astrophysical jets
• GRMHD/RMHD Simulations and Stability of Magnetized Spine-Sheath Relativistic Jets
• A relativistic partially electromagnetic planar plasma shock
• Particle Acceleration, Magnetic Field Generation, and Associated Emission in Collisionless Relativistic Jets

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