Growth of concomitant laser-driven collisionless and resistive electron filamentation instabilities over large spatiotemporal scales [electronic resource]
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| Corporate Authors: | , |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Menlo Park, Calif. : Oak Ridge, Tenn. :
Stanford Linear Accelerator Center. ; Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2020.
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| Abstract: | Collective processes in plasmas often induce microinstabilities that play an important role in many space or laboratory plasma environments. Particularly of note is the Weibel-type current filamentation instability, which is believed to drive the creation of collisionless shocks in weakly magnetized astrophysical plasmas. In this paper, this instability class is studied through interactions of ultraintense and short laser pulses with solid foils, leading to localized generation of megaelectronvolt electrons. Proton radiographic measurements of both low- and high-resistivity targets show two distinct, superimposed electromagnetic field patterns arising from the interpenetration of the megaelectronvolt electrons and the background plasma. Particle-in-cell simulations and theoretical estimates suggest that the collisionless Weibel instability building up in the dilute expanding plasmas formed at the target surfaces causes the observed azimuthally symmetric electromagnetic filaments. For a sufficiently high resistivity of the target foil, an additional resistive instability is triggered in the bulk target, giving rise to radially elongated filaments. The data reveal the growth of both filamentation instabilities over large temporal (tens of picoseconds) and spatial (hundreds of micrometres) scales. |
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| Item Description: | Published through Scitech Connect. 06/01/2020. "LLNL-JRNL-823641." "Journal ID: ISSN 1745-2473." ": US2201704." Ruyer, C. ; Bolaǫs, S. ; Albertazzi, B. ; Chen, S. N. ; Antici, P. ; Bḵer, J. ; Dervieux, V. ; Lancia, L. ; Nakatsutsumi, M. ; Romagnani, L. ; et al. SLAC National Accelerator Lab., Menlo Park, CA (United States) PRACE. Agence Nationale de la Recherche. Engineering and Physical Sciences Research Council (EPSRC) Ministry of Education and Science of the Russian Federation. |
| Physical Description: | Size: p. 983-988 : digital, PDF file. |