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

YunQian Cui, Zheng-Ming Sheng, QuanMing Lu, YuTong Li, Jie Zhang

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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.

LanguageEnglish
Article number105201
Number of pages5
JournalScience China: Physics, Mechanics and Astronomy
Volume58
Issue number10
Early online date5 Sep 2015
DOIs
Publication statusPublished - 1 Oct 2015

Fingerprint

magnetohydrodynamic flow
leptons
protons
ions
energy
power spectra
cosmic rays
astrophysics
energy spectra
simulation
shock
interactions
cells
magnetic fields
electrons

Keywords

  • collisionless shock
  • Fermi acceleration
  • lepton plasma flow
  • particle acceleration

Cite this

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title = "Two-stage acceleration of interstellar ions driven by high-energy lepton plasma flows",
abstract = "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.",
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Two-stage acceleration of interstellar ions driven by high-energy lepton plasma flows. / Cui, YunQian; Sheng, Zheng-Ming; Lu, QuanMing; Li, YuTong; Zhang, Jie.

In: Science China: Physics, Mechanics and Astronomy, Vol. 58, No. 10, 105201, 01.10.2015.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Two-stage acceleration of interstellar ions driven by high-energy lepton plasma flows

AU - Cui, YunQian

AU - Sheng, Zheng-Ming

AU - Lu, QuanMing

AU - Li, YuTong

AU - Zhang, Jie

PY - 2015/10/1

Y1 - 2015/10/1

N2 - 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.

AB - 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.

KW - collisionless shock

KW - Fermi acceleration

KW - lepton plasma flow

KW - particle acceleration

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