Temporal structure of double plasma frequency emission of thin beam-heated plasma

Поступаев, В. В.; Burdakov, A. V.; Иванов, И. А.; Sklyarov, V. F.; Arzhannikov, A. V.; Gavrilenko, D.; Kandaurov, I. V.; Kasatov, A. A.; Kurkuchekov, V. V.; Mekler, K. I.; Polosatkin, S. V.; Попов, С. С.; Rovenskikh, A. F.; Sudnikov, A. V.; Sulyaev, Yu. S.; Trunev, Yu.A.; Vyacheslavov, L. N.

doi:10.1063/1.4821608

Cited by 18 publications

(13 citation statements)

References 33 publications

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“…We will mainly focus on generation of electromagnetic (EM) waves in the spatially bounded plasmas typical to beamplasma experiments in mirror traps [10][11][12]. It has been experimentally found that reducing in plasma thickness down to the radiation wavelength is accompanied by the substantial increase in the radiation efficiency [13].…”

Section: Introductionmentioning

confidence: 99%

Simulations of electromagnetic emissions produced in a thin plasma by a continuously injected electron beam

2016

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In this paper, electromagnetic emissions produced in a thin beam-plasma system are studied using two-dimensional particle-in-cell simulations. For the first time, the problem of emission generation in such a system is considered in the realistic formulation allowing for the continuous injection of a relativistic electron beam through the plasma boundary. Specific attention is given to the thin plasma case in which the transverse plasma size is comparable to the typical wavelength of beam-driven oscillations. Such a case is often implemented in laboratory beam-plasma experiments and has a number of peculiarities. Emission from a thin plasma does not require intermediate generation of electromagnetic plasma eigenmodes, as in the infinite case, and is more similar to the regular antenna radiation. In this work, we determine how efficiently the fundamental and second harmonic emissions can be generated in previously modulated and initially homogeneous plasmas.

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Section: Introductionmentioning

confidence: 99%

Simulations of electromagnetic emissions produced in a thin plasma by a continuously injected electron beam

2016

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“…Rr, 52.35.Qz Beam-plasma interaction plays an important role in various physical phenomena such as transport of relativistic electrons in the fast ignition scheme of inertial fusion, gamma-bursts, solar type II and III radio bursts, and collisionless shock waves in the space plasma (see review [1] and references therein). Also, beam-plasma collective interaction determines the efficiency of turbulent plasma heating [2,3] and electromagnetic emission [4][5][6][7] in fusion-oriented mirror traps.One of the most popular and effective tools for theoretical studies of the beam-plasma interaction is numerical simulations by the Particle-In-Cell (PIC) method. At present there is a great number of one-, two-, and three-dimensional PIC codes developed.…”

mentioning

confidence: 99%

“…Also, beam-plasma collective interaction determines the efficiency of turbulent plasma heating [2,3] and electromagnetic emission [4][5][6][7] in fusion-oriented mirror traps.…”

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confidence: 99%

Note on quantitatively correct simulations of the kinetic beam-plasma instability

et al. 2015

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A large number of model particles is shown necessary for quantitatively correct simulations of the kinetic beam-plasma instability with the clouds-in-cells method. The required number of particles scales inversely with the expected growth rate, as in the kinetic regime only a narrow interval of beam velocities is resonant with the wave.PACS numbers: 52.65. Rr, 52.35.Qz Beam-plasma interaction plays an important role in various physical phenomena such as transport of relativistic electrons in the fast ignition scheme of inertial fusion, gamma-bursts, solar type II and III radio bursts, and collisionless shock waves in the space plasma (see review [1] and references therein). Also, beam-plasma collective interaction determines the efficiency of turbulent plasma heating [2,3] and electromagnetic emission [4][5][6][7] in fusion-oriented mirror traps.One of the most popular and effective tools for theoretical studies of the beam-plasma interaction is numerical simulations by the Particle-In-Cell (PIC) method. At present there is a great number of one-, two-, and three-dimensional PIC codes developed. These codes are used to reproduce fine details of the complex chain of intermediary processes that lead to plasma heating or electromagnetic radiation. The beam densities of interest n b are usually much smaller than the plasma density n p . For the fast ignition problem, the electron beams are relatively dense (n b /n p ∼ 0.1) [8][9][10]. Weakly relativistic beams with n b /n p ∼ 10 −4 ÷ 10 −3 are interesting for mirror traps [11][12][13]. Non-relativistic beams of very low density, n b /n p ∼ 10 −8 ÷ 10 −5 are of interest for radiation generation in solar radio bursts [14], though simulated with higher beam densities because of code limitations [14][15][16][17]. The numerical study usually begins from the linear stage of the beam-plasma instability, so the quantitatively correct simulation of this stage at low beam densities is important for the whole process.There are many realizations of the PIC method that differ in the algorithm of charge and current evaluation from positions of model particles. This algorithm is usually referred to as the shape function. One of the simplest shape functions is the triangular one also called CloudsIn-Cells (CIC) or linear interpolation [18]. This shape function is still widely used [14,[19][20][21][22][23][24][25] in spite of availability of more accurate algorithms [26,27].In this paper we show that an uncommonly large number of model particles is necessary for quantitatively correct simulations of the kinetic beam-plasma two-stream instability with the CIC method. The smaller the growth rate the more particles are needed. If the number of particles is insufficient, then the results are only qualitatively correct, that is the beam-plasma system behaves realistically, but the growth rate is underestimated. To prove this statement, we simulate various regimes of the twostream instability with a rather typical three-dimensional CIC code and compare the simulated growth rates with a...

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“…Now, we use SAL to solve a real applied problem of calculating the power of electromagnetic radiation generated in a plasma‐electron beam system . Recent experiments with the GOL‐3 facility have shown that the radiation efficiency of electromagnetic waves (0.1‐0.5 THz) increases (approximately 1 % ) when the transverse sizes of the system are comparable with the length of radiated waves. Linear theory predicted a mechanism of plasma antenna in which continuous injection of a beam into a plasma channel with preliminary longitudinal density modulation provides high efficiency (up to 10%) of radiation generation at the plasma frequency.…”

Section: Antenna Generation Of Electromagnetic Radiation In Electron mentioning

confidence: 99%

A simple absorbing layer for EM‐radiation from a beam‐plasma interaction system

Berendeev

Dudnikova

Efimova

et al. 2018

Math Methods in App Sciences

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In this paper, a problem of taking into account the electromagnetic radiation power in a numerical simulation of electron beam-plasma interaction is considered. The numerical model is based on the particle-in-cell (PIC) method and the finite-difference time-domain (FDTD) scheme for solving Maxwell equations.As a boundary condition, it is proposed to use a simple layer of absorption, that is, artificial attenuation of an electromagnetic wave by multiplying the electromagnetic field in the boundary domain by a coefficient k < 1 depending on the distance to the boundary. The numerical experiments performed show that using such a layer for absorbing the electromagnetic radiation and for taking into account its power is efficient.

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Temporal structure of double plasma frequency emission of thin beam-heated plasma

Cited by 18 publications

References 33 publications

Simulations of electromagnetic emissions produced in a thin plasma by a continuously injected electron beam

Simulations of electromagnetic emissions produced in a thin plasma by a continuously injected electron beam

Note on quantitatively correct simulations of the kinetic beam-plasma instability

A simple absorbing layer for EM‐radiation from a beam‐plasma interaction system

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