Observations of pressure anisotropy effects within semi-collisional magnetized plasma bubbles
| Autor: | Satyabrata Kar, Louise Willingale, E. T. Gumbrell, A. F. A. Bott, G. Cooper, P. Durey, C. N. Danson, A. G. R. Thomas, Nigel Woolsey, Gianluca Gregori, P. Treadwell, John Foster, Robert Kingham, Archis Joglekar, Mark Read, J. Skidmore, Sarah Wilson, Christopher Spindloe, Eleanor Tubman, Thomas Hodge, Christopher Ridgers, Marco Borghesi, B. Coleman, P. Graham, M. P. Hill |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Proton
High energy density physics Science General Physics and Astronomy 01 natural sciences General Biochemistry Genetics and Molecular Biology 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake Physics::Plasma Physics physics.plasm-ph 0103 physical sciences Nernst equation 010306 general physics Anisotropy Physics Resistive touchscreen Multidisciplinary General Chemistry Plasma Magnetic field Computational physics Physics::Space Physics symbols Interaction layer |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021) Tubman, E R, Joglekar, A S, Bott, A F A, Borghesi, M, Coleman, B, Cooper, G, Danson, C N, Durey, P, Foster, J M, Graham, P, Gregori, G, Gumbrell, E T, Hill, M P, Hodge, T, Kar, S, Kingham, R J, Read, M, Ridgers, C P, Skidmore, J, Spindloe, C, Thomas, A G R, Treadwell, P, Wilson, S, Willingale, L & Woolsey, N C 2021, ' Observations of pressure anisotropy effects within semi-collisional magnetized plasma bubbles ', Nature Communications, vol. 12, no. 1, 334 . https://doi.org/10.1038/s41467-020-20387-7 |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-020-20387-7 |
| Popis: | Magnetized plasma interactions are ubiquitous in astrophysical and laboratory plasmas. Various physical effects have been shown to be important within colliding plasma flows influenced by opposing magnetic fields, however, experimental verification of the mechanisms within the interaction region has remained elusive. Here we discuss a laser-plasma experiment whereby experimental results verify that Biermann battery generated magnetic fields are advected by Nernst flows and anisotropic pressure effects dominate these flows in a reconnection region. These fields are mapped using time-resolved proton probing in multiple directions. Various experimental, modelling and analytical techniques demonstrate the importance of anisotropic pressure in semi-collisional, high-β plasmas, causing a reduction in the magnitude of the reconnecting fields when compared to resistive processes. Anisotropic pressure dynamics are crucial in collisionless plasmas, but are often neglected in collisional plasmas. We show pressure anisotropy to be essential in maintaining the interaction layer, redistributing magnetic fields even for semi-collisional, high energy density physics (HEDP) regimes. |
| Databáze: | OpenAIRE |
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