Nonlinear theory of Kelvin-Helmholtz instability

Власов, В. П.; Zhdanov, S. K.; Trubnikov, B. A.

doi:10.1007/bf01058999

Cited by 2 publications

(6 citation statements)

References 2 publications

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“…We note that acceleration by the pulsed electric field related to the current break takes place at the periphery of the pinch in a characteristic layer determined by the fieldscreening radius [18] R e = [J/(2πn 1 e ce)] 1/2 , where n 1 e is the electron density in the peripheral region of the pinch. If we equate this size to the size of the laser spot (R = 7.5 µm) at the current of 0.3 MA, this density is 5 × 10 19 cm −3 , which is slightly smaller than the electron density in the pinch itself.…”

Section: Theoretical Estimationsmentioning

confidence: 95%

“…Pinch mechanisms of ion acceleration are related to strong electric fields arising either from spatial separation of charges in the pinch [17] or from a pinch-current break [18]. Below, we give estimates of acceleration owing to the pinch-current break.…”

Section: Theoretical Estimationsmentioning

confidence: 99%

“…Below, we give estimates of acceleration owing to the pinch-current break. Following [18], one can readily estimate characteristic values of electric fields at this break on the basis of the Maxwell equations…”

Section: Theoretical Estimationsmentioning

confidence: 99%

“…Following [18], we can estimate the total number of accelerated particles, N 0 , by multiplying the characteristic density of the peripheral plasma by its volume:…”

Section: Theoretical Estimationsmentioning

confidence: 99%

“…All these estimates are tentative and ignore pinchformation dynamics. Actually, two acceleration mechanisms are realized in the pinch according to [18]. These are (i) an electrodynamic mechanism related to the electric field resulting from an abrupt current break, and (ii) a gas-dynamic mechanism resulting from the squeezing of plasma out of the pinch waist as the magnetohydrodynamic instability develops.…”

Section: Theoretical Estimationsmentioning

confidence: 99%

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10.1007/s11450-008-3006-3

2010

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The results of experiments devoted to studying the generation of MeV photons and protons in picosecond laser plasmas at a laser beam intensity of 10 18 W/cm 2 on Be, Ta, LiF and H 7 Li targets are presented. Nuclear reactions (γ, n) and (p, n) were used to detect MeV photons and protons. The number of MeV photons and protons generated in laser plasmas was found from the measured neutron yield. Possibilities of particle acceleration due to the formation of pinch structures in laser plasmas are discussed. Calculated and experimental results are compared.

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Section: Theoretical Estimationsmentioning

confidence: 95%

Section: Theoretical Estimationsmentioning

confidence: 99%

Section: Theoretical Estimationsmentioning

confidence: 99%

“…Following [18], we can estimate the total number of accelerated particles, N 0 , by multiplying the characteristic density of the peripheral plasma by its volume:…”

Section: Theoretical Estimationsmentioning

confidence: 99%

Section: Theoretical Estimationsmentioning

confidence: 99%

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10.1007/s11450-008-3006-3

2010

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Particle Acceleration in Mildly Relativistic Shearing Flows: The Interplay of Systematic and Stochastic Effects, and the Origin of the Extended High-energy Emission in AGN Jets

Liu

Rieger

Aharonian

2017

ApJ

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The origin of the extended X-ray emission in the large-scale jets of active galactic nuclei (AGNs) poses challenges to conventional models of acceleration and emission. Although the electron synchrotron radiation is considered the most feasible radiation mechanism, the formation of the continuous large-scale X-ray structure remains an open issue. As astrophysical jets are expected to exhibit some turbulence and shearing motion, we here investigate the potential of shearing flows to facilitate an extended acceleration of particles and evaluate its impact on the resultant particle distribution. Our treatment incorporates systematic shear and stochastic second-order Fermi effects. We show that for typical parameters applicable to large-scale AGN jets, stochastic second-order Fermi acceleration, which always accompanies shear particle acceleration, can play an important role in facilitating the whole process of particle energization. We study the time-dependent evolution of the resultant particle distribution in the presence of second-order Fermi acceleration, shear acceleration, and synchrotron losses using a simple Fokker-Planck approach and provide illustrations for the possible emergence of a complex (multicomponent) particle energy distribution with different spectral branches. We present examples for typical parameters applicable to large-scale AGN jets, indicating the relevance of the underlying processes for understanding the extended X-ray emission and the origin of ultrahigh-energy cosmic rays.

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Nonlinear theory of Kelvin-Helmholtz instability

Cited by 2 publications

References 2 publications

10.1007/s11450-008-3006-3

10.1007/s11450-008-3006-3

Particle Acceleration in Mildly Relativistic Shearing Flows: The Interplay of Systematic and Stochastic Effects, and the Origin of the Extended High-energy Emission in AGN Jets

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