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The Influence of the Hall Term on the Development of Magnetized Laser-Produced Plasma Jets

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.5017202· OSTI ID:1435720
 [1];  [2];  [3]
  1. Cornell Univ., Ithaca, NY (United States). School of Electrical and Computer Engineering; Cornell University
  2. Cornell Univ., Ithaca, NY (United States). School of Electrical and Computer Engineering
  3. Centre National de la Recherche Scientifique (CNRS), Paris (France). LERMA, Observatoire de Paris; PSL Research Univ., Paris (France); Sorbonne Univ., Paris (France)
We present 2D axisymmetric simulation results describing the influence of the Hall term on laser-produced plasma jets and their interaction with an applied magnetic field parallel to the laser axis. Bending of the poloidal B-field lines produces an MHD shock structure surrounding a conical cavity, and a jet is produced from the convergence of the shock envelope. Both the jet and the conical cavity underneath it are bound by fast MHD shocks. We compare the MHD results generated using the extended-MHD code Physics as an Extended-MHD Relaxation System with an Efficient Upwind Scheme (PERSEUS) with MHD results generated using GORGON and find reasonable agreement. We then present extended-MHD results generated using PERSEUS, which show that the Hall term has several effects on the plasma jet evolution. A hot low-density current-carrying layer of plasma develops just outside the plume, which results in a helical rather than a purely poloidal B-field, and reduces magnetic stresses, resulting in delayed flow convergence and jet formation. The flow is partially frozen into the helical field, resulting in azimuthal rotation of the jet. The Hall term also produces field-aligned current in strongly magnetized regions. In particular, we find the influence of Hall physics on this problem to be scale-dependent. In conclusion, this points to the importance of mitigating the Hall effect in a laboratory setup, by increasing the jet density and system dimensions, in order to avoid inaccurate extrapolation to astrophysical scales.
Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001836; NA0003764
OSTI ID:
1435720
Alternate ID(s):
OSTI ID: 1434831
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 25; ISSN PHPAEN; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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The influence of Hall physics on power-flow along a coaxial transmission line journal October 2018

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