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Title: The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles

Abstract

We present an experimental study of the development and structure of bow shocks produced by the interaction of a magnetised, collisional, super-Alfvénic plasma flow with conducting cylindrical obstacles. The plasma flow with an embedded, frozen-in magnetic field (Re M ~ 20) is produced by the current-driven ablation of fine aluminium wires in an inverse, exploding wire array z-pinch. We show that the orientation of the embedded field with respect to the obstacles has a dramatic effect on the bow shock structure. When the field is aligned with the obstacle, a sharp bow shock is formed with a global structure that is determined simply by the fast magneto-sonic Mach number. When the field is orthogonal to the obstacle, magnetic draping occurs. This leads to the growth of a magnetic precursor and the subsequent development of a magnetised bow shock that is mediated by two-fluid effects, with an opening angle and a stand-off distance, that are both many times larger than in the parallel geometry. By changing the field orientation, we change the fluid regime and physical mechanisms that are responsible for the development of the bow shocks. MHD simulations show good agreement with the structure of well-developed bow shocks. However, collisionless,more » two-fluid effects will need to be included within models to accurately reproduce the development of the shock with an orthogonal B-field.« less

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [2];  [3]; ORCiD logo [4];  [5]
  1. Imperial College, London (United Kingdom)
  2. Univ. of California, San Diego, CA (United States)
  3. Sorbonne Univ., Paris (France)
  4. Univ. of Rochester, NY (United States)
  5. West Virginia Univ., Morgantown, WV (United States)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1535326
Alternate Identifier(s):
OSTI ID: 1369579
Grant/Contract Number:  
SC0001063; FC03-02NA00057
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 7; 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; Physics

Citation Formats

Burdiak, G. C., Lebedev, S. V., Bland, S. N., Clayson, T., Hare, J., Suttle, L., Suzuki-Vidal, F., Garcia, D. C., Chittenden, J. P., Bott-Suzuki, S., Ciardi, A., Frank, A., and Lane, T. S. The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles. United States: N. p., 2017. Web. doi:10.1063/1.4993187.
Burdiak, G. C., Lebedev, S. V., Bland, S. N., Clayson, T., Hare, J., Suttle, L., Suzuki-Vidal, F., Garcia, D. C., Chittenden, J. P., Bott-Suzuki, S., Ciardi, A., Frank, A., & Lane, T. S. The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles. United States. doi:10.1063/1.4993187.
Burdiak, G. C., Lebedev, S. V., Bland, S. N., Clayson, T., Hare, J., Suttle, L., Suzuki-Vidal, F., Garcia, D. C., Chittenden, J. P., Bott-Suzuki, S., Ciardi, A., Frank, A., and Lane, T. S. Fri . "The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles". United States. doi:10.1063/1.4993187. https://www.osti.gov/servlets/purl/1535326.
@article{osti_1535326,
title = {The structure of bow shocks formed by the interaction of pulsed-power driven magnetised plasma flows with conducting obstacles},
author = {Burdiak, G. C. and Lebedev, S. V. and Bland, S. N. and Clayson, T. and Hare, J. and Suttle, L. and Suzuki-Vidal, F. and Garcia, D. C. and Chittenden, J. P. and Bott-Suzuki, S. and Ciardi, A. and Frank, A. and Lane, T. S.},
abstractNote = {We present an experimental study of the development and structure of bow shocks produced by the interaction of a magnetised, collisional, super-Alfvénic plasma flow with conducting cylindrical obstacles. The plasma flow with an embedded, frozen-in magnetic field (ReM ~ 20) is produced by the current-driven ablation of fine aluminium wires in an inverse, exploding wire array z-pinch. We show that the orientation of the embedded field with respect to the obstacles has a dramatic effect on the bow shock structure. When the field is aligned with the obstacle, a sharp bow shock is formed with a global structure that is determined simply by the fast magneto-sonic Mach number. When the field is orthogonal to the obstacle, magnetic draping occurs. This leads to the growth of a magnetic precursor and the subsequent development of a magnetised bow shock that is mediated by two-fluid effects, with an opening angle and a stand-off distance, that are both many times larger than in the parallel geometry. By changing the field orientation, we change the fluid regime and physical mechanisms that are responsible for the development of the bow shocks. MHD simulations show good agreement with the structure of well-developed bow shocks. However, collisionless, two-fluid effects will need to be included within models to accurately reproduce the development of the shock with an orthogonal B-field.},
doi = {10.1063/1.4993187},
journal = {Physics of Plasmas},
number = 7,
volume = 24,
place = {United States},
year = {2017},
month = {7}
}

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