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Almost all sources of high energy particles and photons are associated withjet phenomena. Prominent sources of such highly relativistic outflows arepulsar winds and Active Galactic Nuclei. The current understanding of thesejets assumes diluted plasmas which are best described as kinetic phenomena. Inthis kinetic description particle acceleration to ultra-relativistic speeds canoccur in completely unmagnetized and neutral plasmas through insetting effectsof instabilities. Even though the morphology and nature of particle spectra areunderstood to a certain extent, the composition of the jets is not known yet.While Poynting-flux dominated jets are certainly composed of electron-positronplasmas, the understanding of the governing physics in AGN jets is mostlyunclear. In this article we investigate how the constituting elements of anelectron-positron-proton plasma behave differently under the variation of thefundamental mass-ratio m_p/m_e. We studied initially unmagnetizedcounterstreaming plasmas using fully relativistic three-dimensionalparticle-in-cell simulations to investigate the influence of the mass-ratio onparticle acceleration and magnetic field generation in electron-positron-protonplasmas. We covered a range of mass-ratios m_p/m_e between 1 and 100 with aparticle number composition of n_{p^+}/n_{e^+} of 1 in one stream, only protonsare injected in the other, whereas electrons are present in both to guaranteecharge neutrality in the simulation box. We find that with increasing protonmass the instability takes longer to develop and for mass-ratios > 20 theparticles seem to be accelerated in two phases which can be accounted to theindividual instabilities of the different species. This means that for highmass ratios the coupling between electrons/positrons and the heavier protons,which occurs in low mass-ratios, disappears.

The influence of the mass-ratio on the acceleration of particles by filamentation instabilities