On the local measurement of electric currents and magnetic fields using Thomson scattering in Weibel-unstable plasmas
Abstract
Here, we demonstrate the capability of the Thomson Scattering (TS) diagnostic to measure locally the microscopic electron and ion currents in counter-streaming plasmas unstable to the Weibel or current-filamentation instability. Synthetic TS spectra are calculated with particle distribution functions obtained from particle-in-cell simulations and used to accurately reproduce the simulated currents. We show that this technique allows accurate local measurements of the magnetic field, thus opening the way for the complete experimental characterization of the growth rate, saturation, and nonlinear dynamics of electromagnetic instabilities in plasmas. We illustrate the application of this diagnostic to experimental TS data, which yields local measurements of the magnetic field in Weibel-unstable plasmas and indicates that the magnetic energy density reaches ~1% of the kinetic energy density of the flows, in agreement with previous numerical studies.
- Authors:
-
[1];
[3];
[3]
- Univ. of Alberta, Edmonton, AB (Canada); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- OSTI Identifier:
- 1618203
- Alternate Identifier(s):
- OSTI ID: 1638165
- Report Number(s):
- LLNL-JRNL-798717
Journal ID: ISSN 1070-664X; 1001086; TRN: US2106800
- Grant/Contract Number:
- AC02-76SF00515; FWP 100331; FWP 100182; FR36861; AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 5; 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; Non linear dynamics; Thomson scattering; Doppler effect; particle-in-cell method; plasma instabilities; magnetic energy; particle distribution functions; wave mechanics; magnetic fields; Weibel; shocks
Citation Formats
Bruulsema, C., Rozmus, W., Swadling, G. F., Glenzer, S., Park, H. S., Ross, J. S., and Fiuza, F. On the local measurement of electric currents and magnetic fields using Thomson scattering in Weibel-unstable plasmas. United States: N. p., 2020.
Web. doi:10.1063/1.5140674.
Bruulsema, C., Rozmus, W., Swadling, G. F., Glenzer, S., Park, H. S., Ross, J. S., & Fiuza, F. On the local measurement of electric currents and magnetic fields using Thomson scattering in Weibel-unstable plasmas. United States. https://doi.org/10.1063/1.5140674
Bruulsema, C., Rozmus, W., Swadling, G. F., Glenzer, S., Park, H. S., Ross, J. S., and Fiuza, F. Mon .
"On the local measurement of electric currents and magnetic fields using Thomson scattering in Weibel-unstable plasmas". United States. https://doi.org/10.1063/1.5140674. https://www.osti.gov/servlets/purl/1618203.
@article{osti_1618203,
title = {On the local measurement of electric currents and magnetic fields using Thomson scattering in Weibel-unstable plasmas},
author = {Bruulsema, C. and Rozmus, W. and Swadling, G. F. and Glenzer, S. and Park, H. S. and Ross, J. S. and Fiuza, F.},
abstractNote = {Here, we demonstrate the capability of the Thomson Scattering (TS) diagnostic to measure locally the microscopic electron and ion currents in counter-streaming plasmas unstable to the Weibel or current-filamentation instability. Synthetic TS spectra are calculated with particle distribution functions obtained from particle-in-cell simulations and used to accurately reproduce the simulated currents. We show that this technique allows accurate local measurements of the magnetic field, thus opening the way for the complete experimental characterization of the growth rate, saturation, and nonlinear dynamics of electromagnetic instabilities in plasmas. We illustrate the application of this diagnostic to experimental TS data, which yields local measurements of the magnetic field in Weibel-unstable plasmas and indicates that the magnetic energy density reaches ~1% of the kinetic energy density of the flows, in agreement with previous numerical studies.},
doi = {10.1063/1.5140674},
journal = {Physics of Plasmas},
number = 5,
volume = 27,
place = {United States},
year = {Mon May 11 00:00:00 EDT 2020},
month = {Mon May 11 00:00:00 EDT 2020}
}
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