Experimental Observation of a Current-Driven Instability in a Neutral Electron-Positron Beam

被引：47

作者：

Warwick, J. ^{[1
]}

Dzelzainis, T. ^{[1
]}

Dieckmann, M. E. ^{[2
]}

Schumaker, W. ^{[3
]}

Doria, D. ^{[1
]}

Romagnani, L. ^{[4
]}

Poder, K. ^{[5
]}

Cole, J. M. ^{[5
]}

Alejo, A. ^{[1
]}

Yeung, M. ^{[1
]}

Krushelnick, K. ^{[6
]}

Mangles, S. P. D. ^{[5
]}

Najmudin, Z. ^{[5
]}

Reville, B. ^{[1
]}

Samarin, G. M. ^{[1
]}

Symes, D. D. ^{[7
]}

Thomas, A. G. R. ^{[6
,8
]}

Borghesi, M. ^{[1
]}

Sarri, G. ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Math & Phys, Univ Rd, Belfast BT7 1NN, Antrim, North Ireland

[2] Linkoping Univ, Dept Sci & Technol ITN, Campus Norrkoping, S-60174 Norrkoping, Sweden

[3] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

[4] UPMC, Ecole Polytech, CNRS, LULI,CEA, F-91128 Palaiseau, France

[5] Imperial Coll London, Blackest Lab, John Adams Inst Accelerator Sci, London SW7 2AZ, England

[6] Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA

[7] Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England

[8] Univ Lancaster, Phys Dept, Lancaster LA1 4YB, England

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 18期

基金：

英国工程与自然科学研究理事会;

关键词：

GAMMA-RAY BURSTS; LASER-PLASMA INTERACTION; MAGNETIC-FIELDS; FIREBALL MODEL; SHOCKS; ACCELERATION; GENERATION; PARAMETERS; AFTERGLOW; ENERGY;

D O I：

10.1103/PhysRevLett.119.185002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the first experimental observation of a current-driven instability developing in a quasineutral matter-antimatter beam. Strong magnetic fields (>= 1 T) are measured, via means of a proton radiography technique, after the propagation of a neutral electron-positron beam through a background electron-ion plasma. The experimentally determined equipartition parameter of epsilon(B) approximate to 10(-3) is typical of values inferred from models of astrophysical gamma-ray bursts, in which the relativistic flows are also expected to be pair dominated. The data, supported by particle-in-cell simulations and simple analytical estimates, indicate that these magnetic fields persist in the background plasma for thousands of inverse plasma frequencies. The existence of such long-lived magnetic fields can be related to analog astrophysical systems, such as those prevalent in lepton-dominated jets.

引用

页数：5

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