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

Abstract:

: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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Tubman ER,Joglekar AS,Bott AFA,Borghesi M,Coleman B,Cooper G,Danson CN,Durey P,Foster JM,Graham P,Gregori G,Gumbrell ET,Hill MP,Hodge T,Kar S,Kingham RJ,Read M,Ridgers CP,Skidmore J,Spindloe C,Thomas AGR,Treadwe

doi

10.1038/s41467-020-20387-7

subject

Has Abstract

pub_date

2021-01-12 00:00:00

pages

334

issue

1

issn

2041-1723

pii

10.1038/s41467-020-20387-7

journal_volume

12

pub_type

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