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Title: Effects of an axial magnetic field on the current distribution in a Z-pinch implosion with preembedded magnetic field

Abstract

In this study, the fundamental physics of the magnetic field distribution in a plasma implosion with a pre-embedded magnetic field is investigated within a gas puff Z-pinch. Time and space resolved spectroscopy of the polarized Zeeman effect, applied for the first time, reveals the impact of a pre-embedded axial field on the evolution of the current distribution driven by a pulsed-power generator. The measurements show that the azimuthal magnetic field in the imploding plasma, even in the presence of a weak axial magnetic field, is substantially smaller than expected from the ratio of the driving current to the plasma radius. Much of the current flows at large radii through a slowly-imploding, low-density plasma. The development of a force-free current configuration is suggested to explain this phenomenon. Finally, previously unpredicted observations in higher-power imploding-magnetized-plasma experiments, including recent unexplained structures observed in the Magnetized Liner Inertial Fusion experiment, may be explained by the present discovery.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [3];  [4]
  1. Weizmann Inst. of Science, Rehovot (Israel)
  2. Naval Research Lab. (NRL), Washington, DC (United States). Plasma Physics Division
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Holon Institute of Technology (Israel)
Publication Date:
Research Org.:
US Dept. of Energy, Washington, DC (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1466736
Grant/Contract Number:  
NA0003764
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Mikitchuk, D., Cvejic, M., Doron, R., Kroupp, E., Stollberg, C., Maron, Y., Velikovich, A. L., Ouart, D., Giuliani, J.L., Mehlhorn, T. A., Yu, E. P., and Fruchtman, A. Effects of an axial magnetic field on the current distribution in a Z-pinch implosion with preembedded magnetic field. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.122.045001.
Mikitchuk, D., Cvejic, M., Doron, R., Kroupp, E., Stollberg, C., Maron, Y., Velikovich, A. L., Ouart, D., Giuliani, J.L., Mehlhorn, T. A., Yu, E. P., & Fruchtman, A. Effects of an axial magnetic field on the current distribution in a Z-pinch implosion with preembedded magnetic field. United States. doi:10.1103/PhysRevLett.122.045001.
Mikitchuk, D., Cvejic, M., Doron, R., Kroupp, E., Stollberg, C., Maron, Y., Velikovich, A. L., Ouart, D., Giuliani, J.L., Mehlhorn, T. A., Yu, E. P., and Fruchtman, A. Tue . "Effects of an axial magnetic field on the current distribution in a Z-pinch implosion with preembedded magnetic field". United States. doi:10.1103/PhysRevLett.122.045001. https://www.osti.gov/servlets/purl/1466736.
@article{osti_1466736,
title = {Effects of an axial magnetic field on the current distribution in a Z-pinch implosion with preembedded magnetic field},
author = {Mikitchuk, D. and Cvejic, M. and Doron, R. and Kroupp, E. and Stollberg, C. and Maron, Y. and Velikovich, A. L. and Ouart, D. and Giuliani, J.L. and Mehlhorn, T. A. and Yu, E. P. and Fruchtman, A.},
abstractNote = {In this study, the fundamental physics of the magnetic field distribution in a plasma implosion with a pre-embedded magnetic field is investigated within a gas puff Z-pinch. Time and space resolved spectroscopy of the polarized Zeeman effect, applied for the first time, reveals the impact of a pre-embedded axial field on the evolution of the current distribution driven by a pulsed-power generator. The measurements show that the azimuthal magnetic field in the imploding plasma, even in the presence of a weak axial magnetic field, is substantially smaller than expected from the ratio of the driving current to the plasma radius. Much of the current flows at large radii through a slowly-imploding, low-density plasma. The development of a force-free current configuration is suggested to explain this phenomenon. Finally, previously unpredicted observations in higher-power imploding-magnetized-plasma experiments, including recent unexplained structures observed in the Magnetized Liner Inertial Fusion experiment, may be explained by the present discovery.},
doi = {10.1103/PhysRevLett.122.045001},
journal = {Physical Review Letters},
number = ,
volume = 122,
place = {United States},
year = {2018},
month = {8}
}

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