Simulation studies of positron acceleration in a shock wave in a nonuniform external magnetic field

被引：2

作者：

Iwata, Takashi ^{[1
]}

Takahashi, Seiichi ^{[1
]}

Ohsawa, Yukiharu ^{[1
]}

机构：

[1] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan

来源：

PHYSICS OF PLASMAS | 2012年 / 19卷 / 02期

基金：

日本学术振兴会;

关键词：

MAGNETOSONIC WAVE; HYDROMAGNETIC WAVES; PLASMA; PROPAGATION; COLLISIONS; PARTICLES; SOLITONS; LASER; JET;

D O I：

10.1063/1.3676632

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Positron acceleration in a shock wave in an electron-positron-ion plasma is studied with one-dimensional, fully kinetic, electromagnetic particle simulations, with particular attention paid to the effect of inhomogeneity of external magnetic field B-0. First, acceleration to gamma similar to 10(4), where gamma is the Lorentz factor, is demonstrated for a shock wave in a uniform B-0 with the shock speed v(sh) close to c cos theta, where c is the speed of light and theta is the angle between B-0 and the wave normal. The acceleration is not saturated till the end of the simulation run. Then, the effect of nonuniformity of B-0 is investigated: Comparisons are made between the case in which the difference (v(sh) - c cos theta) at the shock front changes from negative to positive values as the shock wave propagates and the case with this relation reversed. The latter is found to create a greater number of high-energy particles than the former. (C) 2012 American Institute of Physics. [doi:10.1063/1.3676632]

引用

页数：8

共 36 条

[1] RELATIVISTIC MAGNETOSONIC SOLITONS WITH REFLECTED PARTICLES IN ELECTRON-POSITRON PLASMAS [J].

ALSOP, D ;

ARONS, J .

PHYSICS OF FLUIDS, 1988, 31 (04) :839-847

[2] NONLINEAR DISPERSIVE OR DISSIPATIVE WAVES IN INHOMOGENEOUS MEDIA [J].

ASANO, N ;

ONO, H .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1971, 31 (06) :1830-&

[3] Electron acceleration and trapping by an oblique shock wave [J].

Bessho, N ;

Ohsawa, Y .

PHYSICS OF PLASMAS, 2002, 9 (03) :979-986

[4] NUMERICAL STUDIES OF MAGNETOSONIC COLLISIONLESS SHOCK-WAVES [J].

BISKAMP, D ;

WELTER, H .

NUCLEAR FUSION, 1972, 12 (06) :663-666

[5] Plasma-wakefield acceleration of an intense positron beam [J].

Blue, BE ;

Clayton, CE ;

O'Connell, CL ;

Decker, FJ ;

Hogan, MJ ;

Huang, C ;

Iverson, R ;

Joshi, C ;

Katsouleas, TC ;

Lu, W ;

Marsh, KA ;

Mori, WB ;

Muggli, P ;

Siemann, R ;

Walz, D .

PHYSICAL REVIEW LETTERS, 2003, 90 (21) :4-214801

[6] High energy electrons, nuclear phenomena and heating in petawatt laser-solid experiments [J].

Cowan, TE ;

Perry, MD ;

Key, MH ;

Ditmire, TR ;

Hatchett, SP ;

Henry, EA ;

Moody, JD ;

Moran, MJ ;

Pennington, DM ;

Phillips, TW ;

Sangster, TC ;

Sefcik, JA ;

Singh, MS ;

Snavely, RA ;

Stoyer, MA ;

Wilks, SC ;

Young, PE ;

Takahashi, Y ;

Dong, B ;

Fountain, W ;

Parnell, T ;

Johnson, J ;

Hunt, AW ;

Kühl, T .

LASER AND PARTICLE BEAMS, 1999, 17 (04) :773-783

[7] COLLISIONLESS DISSIPATION IN QUASI-PERPENDICULAR SHOCKS [J].

FORSLUND, DW ;

QUEST, KB ;

BRACKBILL, JU ;

LEE, K .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1984, 89 (NA4) :2142-2150

[8] Position acceleration to ultrarelativistic energies by an oblique magnetosonic shock wave in an electron-positron-ion plasma [J].

Hasegawa, H ;

Ohsawa, Y .

PHYSICS OF PLASMAS, 2005, 12 (01) :1-7

[9] Persistent acceleration of positrons in a nonstationary shock wave [J].

Hasegawa, H ;

Kato, K ;

Ohsawa, Y .

PHYSICS OF PLASMAS, 2005, 12 (08) :1-6

[10] Pair plasma dominance in the 3C 279 jet on parsec scales [J].

Hirotani, K ;

Iguchi, S ;

Kimura, M ;

Wajima, K .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 1999, 51 (02) :263-267

← 1 2 3 4 →