scholarly journals Some Peculiaritiers of the Relativistic Electron-Positron Plasma Dynamics in the Pulsar Magnetosphere

2000 ◽  
Vol 177 ◽  
pp. 465-468
Author(s):  
Irakli S. Nanobashvili
Keyword(s):  
Magnetic Field ◽  
Relativistic Electron ◽  
Centrifugal Force ◽  
Plasma Particle ◽  
Pulsar Magnetosphere ◽  
Magnetic Field Generation ◽  
Plasma Dynamics ◽  
Electron Positron ◽  
Instability Development ◽  
Aperiodic Instability

AbstractSome aspects of relativistic electron-positron plasma dynamics in the pulsar magnetosphere are discussed. Namely it is shown that if we take into account the influence of centrifugal force, this gives rise to the new dynamical effect of plasma particle radial braking in the pulsar magnetosphere. Also the possibility of aperiodic instability development in the pulsar magnetosphere is demonstrated. The mechanism for the toroidal magnetic field generation is proposed. Besides, the possible changes of the pulsar magnetosphere structure caused by above mentioned processes is considered.

scholarly journals Plasma wake-field excitation by relativistic electron bunches and charged particle acceleration in the presence of external magnetic field

2001 ◽  
Vol 19 (4) ◽  
pp. 597-604 ◽  
Author(s):  
V.A. BALAKIREV ◽  
V.I. KARAS' ◽  
I.V. KARAS' ◽  
V.D. LEVCHENKO
Keyword(s):  
Magnetic Field ◽  
Relativistic Electron ◽  
Magnetoactive Plasma ◽  
High Amplitude ◽  
Plasma Dynamics ◽  
Wake Field ◽  
Electron Bunches ◽  
Plasma Bunch ◽  
Field Excitation ◽  
Wake Fields

High-amplitude plasma wake waves are excited by high-density relativistic electron bunches (REB) moving in a plasma. The wake-fields can be used to accelerate charged particles, to serve as electrostatic wigglers in plasma free-electron lasers (FEL), and also can find many other applications. The electromagnetic fields in the region occupied by the bunch control the dynamics of the bunch itself. This paper presents the results of 2.5-dimensional numerical simulation of the modulation of a long REB in a plasma, the excitation of wake-fields by bunches in a plasma, in particular, in magnetoactive plasma. The previous one-dimensional study has shown that the density-profile modulation of a long bunch moving in plasma results in the growth of the coherent wake-wave amplitude. The bunch modulation occurs at the plasma frequency. The present study is concerned with the REB motion, taking into account the plasma and REB nonlinearities. It is demonstrated that the nonlinear REB/plasma dynamics exerts primary effect on both the REB self-modulation and the wake-field excitation by the bunches formed. We have demonstrated that a multiple excess of the accelerated bunch energy εmax over the energy of the exciting REB is possible in a magnetoactive plasma for a certain relationship between the parameters of the “plasma–bunch–magnetic field” system (owing to a hybrid volume–surface character of REB-excited wake-fields).

scholarly journals Magnetic Field Amplification Driven by the Gyro Motion of Charged Particles

2021 ◽  
Author(s):  
Yan-Jun Gu ◽  
Masakatsu Murakami
Keyword(s):  
Magnetic Field ◽  
Spot Size ◽  
Opposite Polarity ◽  
Laser Wavelength ◽  
Intense Laser ◽  
Magnetic Field Generation ◽  
Plasma Dynamics ◽  
Static Magnetic Fields ◽  
Laser Plasma Interactions ◽  
Field Amplification

Abstract Spontaneous magnetic field generation plays important role in laser-plasma interactions. Strong quasi-static magnetic fields affect the thermal conductivity and the plasma dynamics, particularly in the case of ultra intense laser where the magnetic part of Lorentz force becomes as significant as the electric part. Kinetic simulations of giga-gauss magnetic field amplification via a laser irradiated microtube structure reveal the dynamics of charged particle implosions and the mechanism of magnetic field growth. A giga-gauss magnetic field is generated and amplified with the opposite polarity to the seed magnetic field. The spot size of the field is comparable to the laser wavelength, and the lifetime is hundreds of femtoseconds. An analytical model is presented to explain the underlying physics. This study should aid in designing future experiments.

scholarly journals Magnetic field amplification driven by the gyro motion of charged particles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yan-Jun Gu ◽  
Masakatsu Murakami
Keyword(s):  
Magnetic Field ◽  
Spot Size ◽  
Opposite Polarity ◽  
Laser Wavelength ◽  
Intense Laser ◽  
Magnetic Field Generation ◽  
Plasma Dynamics ◽  
Static Magnetic Fields ◽  
Laser Plasma Interactions ◽  
Field Amplification

AbstractSpontaneous magnetic field generation plays important role in laser-plasma interactions. Strong quasi-static magnetic fields affect the thermal conductivity and the plasma dynamics, particularly in the case of ultra intense laser where the magnetic part of Lorentz force becomes as significant as the electric part. Kinetic simulations of giga-gauss magnetic field amplification via a laser irradiated microtube structure reveal the dynamics of charged particle implosions and the mechanism of magnetic field growth. A giga-gauss magnetic field is generated and amplified with the opposite polarity to the seed magnetic field. The spot size of the field is comparable to the laser wavelength, and the lifetime is hundreds of femtoseconds. An analytical model is presented to explain the underlying physics. This study should aid in designing future experiments.

scholarly journals Quasi-parallel propagation of solitary waves in magnetised non-relativistic electron–positron plasmas

2020 ◽  
Vol 86 (3) ◽  
Author(s):  
Michael S. Ruderman
Keyword(s):  
Magnetic Field ◽  
Wave Propagation ◽  
Relativistic Electron ◽  
Solitary Waves ◽  
Nonlinear Waves ◽  
Spatial Variables ◽  
Electron Positron ◽  
Parallel Propagation ◽  
The Stability ◽  
The Waves

We study the propagation of nonlinear waves in non-relativistic electron–positron plasmas. The waves are assumed to propagate at small angles with respect to the equilibrium magnetic field. We derive the equation describing the wave propagation under the assumption that the waves are weakly dispersive and also can weakly depend on spatial variables orthogonal to the equilibrium magnetic field. We obtain solutions of the derived equation describing solitons. Then we study the stability of solitons with respect to transverse perturbations.

scholarly journals Propagation of Electromagnetic Waves in Pulsar Magnetospheres

2001 ◽  
Vol 182 ◽  
pp. 77-80
Author(s):  
Ya. Istomin
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Waves ◽  
Numerical Code ◽  
Pulsar Magnetosphere ◽  
Electron Positron ◽  
The Waves

AbstractWe have developed a numerical code for the propagation of different electromagnetic modes in a pulsar magnetosphere filled by a relativistic, streaming electron-positron plasma in a strong, curved magnetic field. We determine the trajectories, limiting polarization and damping of the waves leaving the magnetosphere.

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