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Title: Identifying the linear phase of the relativistic Kelvin-Helmholtz instability and measuring its growth rate via radiation

Abstract

For the relativistic Kelvin-Helmholtz instability (KHI), which occurs at shear interfaces between two plasma streams, we report results on the polarized radiation over all observation directions and frequencies emitted by the plasma electrons from ab initio kinetic simulations. We find the polarization of the radiation to provide a clear signature for distinguishing the linear phase of the KHI from its other phases. During the linear phase, we predict the growth rate of the KHI radiation power to match the growth rate of the KHI to a high degree. Our predictions are based on a model of the vortex dynamics, which describes the electron motion in the vicinity of the shear interface between the two streams. Albeit the complex and turbulent dynamics happening in the shear region, we find excellent agreement between our model and large-scale particle-in-cell simulations. Our findings pave the way for identifying the KHI linear regime and for measuring its growth rate in astrophysical jets observable on earth as well as in laboratory plasmas.

Authors:
 [1];  [2];  [1];  [1];  [1];  [2];  [2]
  1. Helmholtz-Zentrum Dresden - Rossendorf (Germany); Technische Univ. Dresden (Germany)
  2. Helmholtz-Zentrum Dresden - Rossendorf (Germany)
Publication Date:
Research Org.:
UT-Battelle LLC/ORNL, Oak Ridge, TN (Unted States); Oak Ridge National Laboratory, Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1565611
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Pausch, R., Bussmann, M., Huebl, A., Schramm, U., Steiniger, K., Widera, R., and Debus, A. Identifying the linear phase of the relativistic Kelvin-Helmholtz instability and measuring its growth rate via radiation. United States: N. p., 2017. Web. doi:10.1103/physreve.96.013316.
Pausch, R., Bussmann, M., Huebl, A., Schramm, U., Steiniger, K., Widera, R., & Debus, A. Identifying the linear phase of the relativistic Kelvin-Helmholtz instability and measuring its growth rate via radiation. United States. doi:10.1103/physreve.96.013316.
Pausch, R., Bussmann, M., Huebl, A., Schramm, U., Steiniger, K., Widera, R., and Debus, A. Sat . "Identifying the linear phase of the relativistic Kelvin-Helmholtz instability and measuring its growth rate via radiation". United States. doi:10.1103/physreve.96.013316.
@article{osti_1565611,
title = {Identifying the linear phase of the relativistic Kelvin-Helmholtz instability and measuring its growth rate via radiation},
author = {Pausch, R. and Bussmann, M. and Huebl, A. and Schramm, U. and Steiniger, K. and Widera, R. and Debus, A.},
abstractNote = {For the relativistic Kelvin-Helmholtz instability (KHI), which occurs at shear interfaces between two plasma streams, we report results on the polarized radiation over all observation directions and frequencies emitted by the plasma electrons from ab initio kinetic simulations. We find the polarization of the radiation to provide a clear signature for distinguishing the linear phase of the KHI from its other phases. During the linear phase, we predict the growth rate of the KHI radiation power to match the growth rate of the KHI to a high degree. Our predictions are based on a model of the vortex dynamics, which describes the electron motion in the vicinity of the shear interface between the two streams. Albeit the complex and turbulent dynamics happening in the shear region, we find excellent agreement between our model and large-scale particle-in-cell simulations. Our findings pave the way for identifying the KHI linear regime and for measuring its growth rate in astrophysical jets observable on earth as well as in laboratory plasmas.},
doi = {10.1103/physreve.96.013316},
journal = {Physical Review E},
issn = {2470-0045},
number = 1,
volume = 96,
place = {United States},
year = {2017},
month = {7}
}

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