Observations of pressure anisotropy effects within semi-collisional magnetized plasma bubbles

Tubman, E. R.; Joglekar, A. S.; Bott, A. 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. R.; Treadwell, P.; Wilson, S.; Willingale, L.; Woolsey, N. C.

doi:10.1038/s41467-020-20387-7

Title: Observations of pressure anisotropy effects within semi-collisional magnetized plasma bubbles

Journal Article · Tue Jan 12 00:00:00 EST 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-20387-7· OSTI ID:1809193

^[1]; Joglekar, A. S. ^[2]; Bott, A. A. ^[3]; Borghesi, M. ^[4]; Coleman, B. ^[4]; Cooper, G. ^[5]; Danson, C. N. ^[6]; Durey, P. ^[7]; Foster, J. M. ^[5]; Graham, P. ^[5]; Gregori, G. ^[3]; Gumbrell, E. T. ^[8];

^[5]; Hodge, T. ^[4];

^[4];

^[9];

^[10]; Ridgers, C. P. ^[7]; Skidmore, J. ^[11]; Spindloe, C. ^[12] more »

Univ. of York (United Kingdom); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Imperial College, London (United Kingdom)
Univ. of Michigan, Ann Arbor, MI (United States); Univ. of California, Los Angeles, CA (United States); Noble.AI, San Francisco, CA (United States)
Univ. of Oxford (United Kingdom)
Queen's Univ., Belfast, Northern Ireland (United Kingdom)
AWE Aldermaston, Reading (United Kingdom)
Imperial College, London (United Kingdom); Univ. of Oxford (United Kingdom); AWE Aldermaston, Reading (United Kingdom)
Univ. of York (United Kingdom)
Imperial College, London (United Kingdom); AWE Aldermaston, Reading (United Kingdom)
Imperial College, London (United Kingdom)
Univ. of York (United Kingdom); First Light Fusion, Oxford (United Kingdom)
AWE Aldermaston, Reading (United Kingdom); First Light Fusion, Oxford (United Kingdom)
Appleton Laboratory, Didcot (United Kingdom)
Univ. of Michigan, Ann Arbor, MI (United States)

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1809193

Report Number(s):: LLNL-JRNL-817125; 1024504; TRN: US2212983

Journal Information:: Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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