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Experimental Observation of a Current-Driven Instability in a Neutral Electron-Positron Beam
Queens University of Belfast, North Ireland.
Queens University of Belfast, North Ireland.
Linköping University, Department of Science and Technology, Media and Information Technology. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-4055-0552
SLAC National Accelerator Lab, CA 94025 USA.
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 18, article id 185002Article in journal (Refereed) Published
Abstract [en]

We report on the first experimental observation of a current-driven instability developing in a quasineutral matter-antimatter beam. Strong magnetic fields (amp;gt;= 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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 119, no 18, article id 185002
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:liu:diva-143254DOI: 10.1103/PhysRevLett.119.185002ISI: 000414336400013OAI: oai:DiVA.org:liu-143254DiVA, id: diva2:1160411
Note

Funding Agencies|EPSRC [EP/N022696/1, EP/N027175/1, EP/L013975/1, EP/N002644/1, EP/P010059/1]; DOE [DE-NA0002372]; ARO [W911NF-16-1-0044]

Available from: 2017-11-27 Created: 2017-11-27 Last updated: 2017-12-05

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