Speaker
M. Dieckmann
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/O2.202.pdf
Experimental Observation of a Current-Driven Instability in a Neutral
Electron-Positron Beam
J.R. Warwick1
, T. Dzelzainis1
, M. Yeung1
, D.J. Corvan1
, M.E. Dieckmann2
, D. Doria1
,
L. Romagnani3
, W. Schumaker4
, A. Alejo1
, J.M. Cole5
, K. Krushelnick6
,
S.P.D. Mangles5
, Z. Najmudin5
, K. Poder7
, B. Reville1
, G.M. Samarin1
, D.R. Symes8
,
A.G.R. Thomas6
, M. Zepf1,9, M. Borghesi1
and G. Sarri1
1 Queen’s University Belfast, Belfast, UK
2 Linköping University, Norrköping, Sweden
3 LULI, École Polytechnique, CNRS, CEA, UPMC, Paris, France
4 SLAC National Accelerator Laboratory, Menlo Park, USA
5
Imperial College London, London, UK
6 University of Michigan, Ann Arbor, USA
7 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
8 Rutherford Appleton Laboratory, Didcot, UK
9 Helmholtz Institute Jena, Jena, Germany
The first experimental observation of a current-driven instability developing within a
quasi-neutral matter-antimatter beam is reported herein. Using the proton radiography
technique, strong remnant magnetic fields (≥ 1 T) are measured after the propagation of a
quasi-neutral electron-positron beam through a background electron-ion plasma [1, 2]. The
data, along with supporting particle-in-cell simulations and analytical estimations, implies that
the generated magnetic fields persist for thousands of inverse plasma frequencies. The relation
of this work with the dynamics of pair-dominated astrophysical jets will be discussed [1, 2].
References
[1] Warwick, J., et al. “Experimental observation of a current-driven instability in a neutral electron-positron
beam.” Physical Review Letters, 119, 185002 (2017).
[2] Warwick, J. R., et al. “General features of experiments on the dynamics of laser-driven electron-positron
beams.” Nucl. Instrum. Meth. Phys. Res. A, in press, (2018). arXiv:1802.01394v1 [physics.plasm-ph]
