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Title: Formation of collisionless shocks in magnetized plasma interaction with kinetic-scale obstacles

Abstract

We investigate the formation of collisionless magnetized shocks triggered by the interaction between magnetized plasma flows and miniature-sized (order of plasma kinetic-scales) magnetic obstacles resorting to massively parallel, full particle-in-cell simulations, including the electron kinetics. The critical obstacle size to generate a compressed plasma region ahead of these objects is determined by independently varying the magnitude of the dipolar magnetic moment and the plasma magnetization. Here we find that the effective size of the obstacle depends on the relative orientation between the dipolar and plasma internal magnetic fields, and we show that this may be critical to form a shock in small-scale structures. We also study the microphysics of the magnetopause in different magnetic field configurations in 2D and compare the results with full 3D simulations. Finally, we evaluate the parameter range where such miniature magnetized shocks can be explored in laboratory experiments.

Authors:
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [1]
  1. Univ. of Lisbon (Portugal). Inst. Superior Tecnico, Inst. of Plasmas and Nuclear Fusion, Group for Lasers and Plasmas (GoLP)
  2. Univ. of Lisbon (Portugal). Inst. Superior Tecnico, Inst. of Plasmas and Nuclear Fusion, Group for Lasers and Plasmas (GoLP); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
  4. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL); Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)
  5. Univ. of Lisbon (Portugal). Inst. Superior Tecnico, Inst. of Plasmas and Nuclear Fusion, Group for Lasers and Plasmas (GoLP); Univ. of Lisbon (Portugal). Inst. Univ. de Lisboa (ISCTE-IUL), Dept. of Information Science and Technology (DCTI)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1353106
Grant/Contract Number:  
ERC-2015-AdG 695088; AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; mini magnetospheres; collisionless shocks; space physics; PIC simulations

Citation Formats

Cruz, F., Alves, E. P., Bamford, R. A., Bingham, R., Fonseca, R. A., and Silva, L. O. Formation of collisionless shocks in magnetized plasma interaction with kinetic-scale obstacles. United States: N. p., 2017. Web. doi:10.1063/1.4975310.
Cruz, F., Alves, E. P., Bamford, R. A., Bingham, R., Fonseca, R. A., & Silva, L. O. Formation of collisionless shocks in magnetized plasma interaction with kinetic-scale obstacles. United States. doi:10.1063/1.4975310.
Cruz, F., Alves, E. P., Bamford, R. A., Bingham, R., Fonseca, R. A., and Silva, L. O. Mon . "Formation of collisionless shocks in magnetized plasma interaction with kinetic-scale obstacles". United States. doi:10.1063/1.4975310. https://www.osti.gov/servlets/purl/1353106.
@article{osti_1353106,
title = {Formation of collisionless shocks in magnetized plasma interaction with kinetic-scale obstacles},
author = {Cruz, F. and Alves, E. P. and Bamford, R. A. and Bingham, R. and Fonseca, R. A. and Silva, L. O.},
abstractNote = {We investigate the formation of collisionless magnetized shocks triggered by the interaction between magnetized plasma flows and miniature-sized (order of plasma kinetic-scales) magnetic obstacles resorting to massively parallel, full particle-in-cell simulations, including the electron kinetics. The critical obstacle size to generate a compressed plasma region ahead of these objects is determined by independently varying the magnitude of the dipolar magnetic moment and the plasma magnetization. Here we find that the effective size of the obstacle depends on the relative orientation between the dipolar and plasma internal magnetic fields, and we show that this may be critical to form a shock in small-scale structures. We also study the microphysics of the magnetopause in different magnetic field configurations in 2D and compare the results with full 3D simulations. Finally, we evaluate the parameter range where such miniature magnetized shocks can be explored in laboratory experiments.},
doi = {10.1063/1.4975310},
journal = {Physics of Plasmas},
number = 2,
volume = 24,
place = {United States},
year = {Mon Feb 06 00:00:00 EST 2017},
month = {Mon Feb 06 00:00:00 EST 2017}
}

Journal Article:
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