The effect of density gradient on the growth rate of relativistic Weibel instability

Journal Article · Sat Feb 15 00:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4865829· OSTI ID:22252042

Mahdavi, M., E-mail: [e-mail] ^[1]; Khodadadi Azadboni, F., E-mail: [e-mail] ^[1]; Young Researchers Club, Sari Branch, Islamic Azad University, P.O. Box 48161-194, Sari ^[2]

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1. Physics Department, University of Mazandaran, P.O. Box 47415-416, Babolsar (Iran, Islamic Republic of)
2. (Iran, Islamic Republic of)

In this paper, the effect of density gradient on the Weibel instability growth rate is investigated. The density perturbations in the near corona fuel, where temperature anisotropy, η, is larger than the critical temperature anisotropy, η{sub c}, (η > η{sub c}), enhances the growth rate of Weibel instability due to the sidebands coupled with the electron oscillatory velocity. But for η < η{sub c}, the thermal spread of the energetic electrons reduces the growth rate. Also, the growth rate can be reduced if the relativistic parameter (Lorentz factor) is sufficiently large, γ > 2. The analysis shows that relativistic effects and density gradient tend to stabilize the Weibel instability. The growth rate can be reduced by 88% by reducing η by a factor of 100 and increasing relativistic parameter by a factor of 3.

• OSTI ID: 22252042
• Journal Information: Physics of Plasmas, Vol. 21, Issue 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANISOTROPY
AUGMENTATION
CRITICAL TEMPERATURE
INSTABILITY GROWTH RATES
PERTURBATION THEORY
RELATIVISTIC RANGE
TAIL ELECTRONS
VELOCITY