title: Self-generated magnetic dipoles in weakly magnetized beam-plasma system.
abstract: A self-generation mechanism of magnetic dipoles and the anomalous energy dissipation of fast electrons in a magnetized beam-plasma system are presented. Based on two-dimensional particle-in-cell simulations, it is found that the magnetic dipoles are self-organized and play important roles in the beam electron energy dissipation. These dipoles drift slowly in the direction of the return flow with a quasisteady velocity, which depends upon the magnetic amplitude of the dipole and the imposed external magnetic field. This dipole formation provides a mechanism for the anomalous energy dissipation of a relativistic electron beam, which would play an important role in collisionless shock and ion shock acceleration.
authors.affiliation: HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China.|Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan.
authors.forename: Qing
authors.initials: Q
authors.lastname: Jia
authors.affiliation: Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan.|Graduate School for the Creation of New Photonics Industries, Hamamatsu 431-1202, Japan.
authors.forename: Kunioki
authors.initials: K
authors.lastname: Mima
authors.affiliation: HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China.|Institute of Applied Physics and Computational Mathematics, Beijing 100094, China.
authors.forename: Hong-bo
authors.initials: HB
authors.lastname: Cai
authors.affiliation: Department of Electric and Electronic Engineering, Setsunan University, Osaka 572-8508, Japan.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Taguchi
authors.affiliation: Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Nagatomo
authors.affiliation: HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871, China.|Institute of Applied Physics and Computational Mathematics, Beijing 100094, China.
authors.forename: X T
authors.initials: XT
authors.lastname: He