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

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [3];  [1];  [4];  [5];  [5];  [1];  [1];  [6];  [5];  [5];  [1];  [1];  [7];  [8];  [1];  [1]
  1. Queen's Univ., Belfast, Northern Ireland (United Kingdom). School of Mathematics and Physics
  2. Linkoping Univ., Norrkoping (Sweden). Dept. of Science and Technology (ITN)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Ecole Polytechnique, Palaiseau (France). Lab. pour l'Utilisation des Lasers Intenses (LULI)
  5. Imperial College London, London (United Kingdom). John Adams Inst. for Accelerator Science, Blackett Lab.
  6. Univ. of Michigan, Ann Arbor, MI (United States). Center for Ultrafast Optical Science
  7. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL), Central Laser Facility
  8. Univ. of Michigan, Ann Arbor, MI (United States). Center for Ultrafast Optical Science; Lancaster Univ. (United Kingdom). Physics Dept.

Here, we report on the first experimental observation of a current-driven instability developing in a quasineutral matter-antimatter beam. Strong magnetic fields (≥ 1T) 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 εB ≈ 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.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; EP/N-022696/1; EP/N-027175/1; EP/L-013975/1; EP/N-002644/1; EP/P-010059/1; NA-0002372; x-2016046960; NA0002372; x2016046960
OSTI ID:
1410524
Alternate ID(s):
OSTI ID: 1408181
Journal Information:
Physical Review Letters, Vol. 119, Issue 18; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (7)

Twisted ion waves carrying orbital angular momentum in a dense pair-ion plasma journal January 2018
One-dimensional thermal pressure-driven expansion of a pair cloud into an electron-proton plasma journal June 2018
Stability analysis of a periodic system of relativistic current filaments journal July 2018
Expansion of a mildly relativistic hot pair cloud into an electron-proton plasma journal June 2018
Collimated GeV attosecond electron–positron bunches from a plasma channel driven by 10 PW lasers journal January 2019
Electrostatic solitons and Alfvén waves generated by streaming instability in electron-positron plasmas journal July 2018
Electrostatic solitons and Alfvén waves generated by streaming instability in electron-positron plasmas text January 2018

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