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The study of the weibel electromagnetic instability growth rate in the presence of the body stress

Amininasab, S ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1002/ctpp.201800111
  3. Publisher: Wiley-VCH Verlag , 2019
  4. Abstract:
  5. Body stress flow can be expected in the fast ignition imploding of the inertial fusion process that strongly damps small-scale velocity structures. The Weibel instability is one of the plasma instabilities that require anisotropy in the distribution function. The body stress effect was neglected in the calculation of the Weibel instability growth rate. In this article, the propagation condition of impinging waves and the growing modes of the Weibel instability on the plasma density gradient of the fuel fusion with the body stress flow are investigated. Calculations show that the minimum value of the body stress rate threshold in the linear polarization is about 2.96 times greater than that of the circular polarization. Increasing 10 times of the density gradient and decreasing 2 times of the wavelength in the linear polarization and the circular polarization, respectively, lead to about 1.78 × 106 times increment and 0.019 times decrement in the maximum of the Weibel instability growth rate. Also, the Weibel instability growth rate maximum in the circular polarization is about 107 times greater than that of the linear polarization. The body stress flow and the density gradient tend to stabilize the Weibel instability in the circular polarization and act as a destabilizing source in the linear polarization. Therefore, by increasing steps of the density gradient plasma near the relativistic electron beam-emitting region, in the circular polarization, the Weibel instability occurs at a higher stress flow. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  6. Keywords:
  7. Body stress ; Density gradient ; Weibel instability
  8. Source: Contributions to Plasma Physics ; Volume 59, Issue 7 , 2019 ; 08631042 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/ctpp.201800111?af=R