Weibel-Induced Filamentation during an Ultrafast Laser-Driven Plasma Expansion
2012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, no 13, 135001- p.Article in journal (Refereed) Published
The development of current instabilities behind the front of a cylindrically expanding plasma has been investigated experimentally via proton probing techniques. A multitude of tubelike filamentary structures is observed to form behind the front of a plasma created by irradiating solid-density wire targets with a high-intensity (I∼1019 W/cm2), picosecond-duration laser pulse. These filaments exhibit a remarkable degree of stability, persisting for several tens of picoseconds, and appear to be magnetized over a filament length corresponding to several filament radii. Particle-in-cell simulations indicate that their formation can be attributed to a Weibel instability driven by a thermal anisotropy of the electron population. We suggest that these results may have implications in astrophysical scenarios, particularly concerning the problem of the generation of strong, spatially extended and sustained magnetic fields in astrophysical jets.
Place, publisher, year, edition, pages
American Physical Society, 2012. Vol. 108, no 13, 135001- p.
Laser plasma, Weibel instability, simulations
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:liu:diva-76179DOI: 10.1103/PhysRevLett.108.135001OAI: oai:DiVA.org:liu-76179DiVA: diva2:512969
FunderSwedish Research Council, 2010-4063