liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Theory of the formation of a collisionless Weibel shock: pair vs. electron/proton plasmas
ETSI Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain.
Fakultät fuer Physik und Astronomie, Ruhr-Universität Bochum, 44780 Bochum, Germany.
Harvard-Smithsonian Center for Astrophysics, Harvard University, Cambridge, MA 02138, USA.
High Energy Density Science Division, SLAC National Accelerator Lab., Menlo Park, CA 94025, USA.
Show others and affiliations
2016 (English)In: Laser and particle beams (Print), ISSN 0263-0346, E-ISSN 1469-803X, Vol. 34, no 2, 362-367 p.Article in journal (Refereed) Published
Abstract [en]

Collisionless shocks are shocks in which the mean-free path is much larger than the shock front. They are ubiquitous in astrophysics and the object of much current attention as they are known to be excellent particle accelerators that could be the key to the cosmic rays enigma. While the scenario leading to the formation of a fluid shock is well known, less is known about the formation of a collisionless shock. We present theoretical and numerical results on the formation of such shocks when two relativistic and symmetric plasma shells (pair or electron/proton) collide. As the two shells start to interpenetrate, the overlapping region turns Weibel unstable. A key concept is the one of trapping time τp, which is the time when the turbulence in the central region has grown enough to trap the incoming flow. For the pair case, this time is simply the saturation time of the Weibel instability. For the electron/proton case, the filaments resulting from the growth of the electronic and protonic Weibel instabilities, need to grow further for the trapping time to be reached. In either case, the shock formation time is 2τp in two-dimensional (2D), and 3τp in 3D. Our results are successfully checked by particle-in-cell simulations and may help designing experiments aiming at producing such shocks in the laboratory.

Place, publisher, year, edition, pages
2016. Vol. 34, no 2, 362-367 p.
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:liu:diva-127503DOI: 10.1017/S0263034616000197ISI: 000378358100019OAI: oai:DiVA.org:liu-127503DiVA: diva2:931476
Available from: 2016-05-27 Created: 2016-04-28 Last updated: 2016-08-01

Open Access in DiVA

The full text will be freely available from 2016-10-25 17:03
Available from 2016-10-25 17:03

Other links

Publisher's full text

Search in DiVA

By author/editor
Dieckmann, Mark Eric
By organisation
Media and Information TechnologyFaculty of Science & Engineering
In the same journal
Laser and particle beams (Print)
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle ScholarTotal: 3 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 46 hits
ReferencesLink to record
Permanent link

Direct link