Two-stage acceleration of interstellar ions driven by high-energy lepton plasma flows

Autor:	Jie Zhang, Yu-Tong Li, Yun-Qian Cui, Quanming Lu, Zheng-Ming Sheng
Rok vydání:	2015
Předmět:	QC717 Physics Shock (fluid dynamics) Turbulence General Physics and Astronomy Plasma Ion Magnetic field Physics::Fluid Dynamics Nuclear physics Acceleration Physics::Plasma Physics Perpendicular Physics::Accelerator Physics Nuclear Experiment Lepton
Zdroj:	Science China Physics, Mechanics & Astronomy. 58
ISSN:	1869-1927 1674-7348
DOI:	10.1007/s11433-015-5715-2
Popis:	We present the particle-in-cell (PIC) simulation results of the interaction of a high-energy lepton plasma flow with background electron-proton plasma and focus on the acceleration processes of the protons. It is found that the acceleration follows a two-stage process. In the first stage, protons are significantly accelerated transversely (perpendicular to the lepton flow) by the turbulent magnetic field "islands" generated via the strong Weibel-type instabilities. The accelerated protons shows a perfect inverse-power energy spectrum. As the interaction continues, a shockwave structure forms and the protons in front of the shockwave are reflected at twice of the shock speed, resulting in a quasi-monoenergetic peak located near 200 MeV under the simulation parameters. The presented scenario of ion acceleration may be relevant to cosmic-ray generation in some astrophysical environments.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b2f537178de8980a4bf9b2bf9a499f9 https://doi.org/10.1007/s11433-015-5715-2 Zobrazit plný text záznamu Full text from SpringerLink