MM-wave emission by magnetized plasma during sub-relativistic electron beam relaxation

Иванов, И. А.; Аржанников, А. В.; Бурдаков, А. В.; Burmasov, V. S.; Gavrilenko, D. E.; Kasatov, A. A.; Kandaurov, I. V.; Kurkuchekov, V. V.; Kuznetsov, S. А.; Mekler, K. I.; Polosatkin, S. V.; Попов, С. С.; Поступаев, В. В.; Rovenskikh, A. F.; Sklyarov, V. F.; Sorokina, Natalia; Trunev, Yu.A.; Vyacheslavov, L. N.

doi:10.1063/1.4936874

Cited by 14 publications

(5 citation statements)

References 19 publications

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“…We carry out 2D3V high-resolution PIC simulations in slab geometry to study excitation of each plasma wake participating in the collision process by its own self-consistently . Comparison of transverse profiles of wake amplitudes F x 1 ( ) and Φ 2 (x) predicted theoretically (12) with corresponding profiles of electric field E z observed in PIC simulations is shown in figure 7.…”

Section: Excitation Of Wakes By Real Laser Pulsesmentioning

confidence: 86%

“…Generation of electromagnetic (EM) radiation at harmonics of the plasma frequency ω p via nonlinear interaction of electrostatic (potential) plasma waves is a fundamental problem which has long been studied in relation to both space and laboratory plasmas [1][2][3][4][5]. These emission processes are presently believed to play the role in solar radio-bursts [6][7][8] and laboratory experiments on terahertz generation in mirror traps [9][10][11][12][13][14] where potential plasma waves are excited by the directed electron flows. The same nonlinear processes may also generate EM radiation with much shorter wavelengths (UV and x-ray) in a solid-state plasma with counter-streaming electron fluxes arising during two-sided irradiation of a thin foil by relativistically strong laser pulses [15].…”

Section: Introductionmentioning

confidence: 99%

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Simulations of electromagnetic emission from colliding laser wakefields

Тимофеев¹,

Berendeev²,

Annenkov³

et al. 2020

Plasma Phys. Control. Fusion

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Electromagnetic emission at the second harmonic of the plasma frequency produced by nonlinear interaction of counterpropagating laser-driven potential plasma waves are studied using particle-in-cell simulations. This process has been recently proposed as a method for generating high-power tunable THz radiation with a narrow spectral line-width (Timofeev et al 2017 Phys. Plasmas 24 103106). In the present paper, we find the optimal conditions for demonstrating this phenomenon in a laboratory experiment that implies excitation of colliding wakefields by axially symmetric 830 nm Gaussian laser pulses with the total energy 0.2 J in a supersonic gas jet. It is shown that the emission mechanism based on the collision of differentsize wakes is always accompanied with the mechanism of plasma antenna which begins to radiate electromagnetic waves after the build-up of periodic ion density modulation. Such additional emission makes hydrogen more attractive for this generating scheme than gases with heavier atoms.

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Section: Excitation Of Wakes By Real Laser Pulsesmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Simulations of electromagnetic emission from colliding laser wakefields

Тимофеев¹,

Berendeev²,

Annenkov³

et al. 2020

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…Recent experiments on the steady-state injection of a long sub-relativistic electron beam with the energy 100 keV and electric current 20-100 A into a magnetized plasma at the multi-mirror trap GOL-3 (BINP SB RAS) [19][20][21] have demonstrated high emission efficiency which seems unusual for a turbulent beam-plasma system. According to authors' estimates, only in the vicinity of the doubled plasma frequency 2𝜔 𝑝 , the power of EM emission has reached 1% of the beam power.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient electromagnetic emission during 100 keV electron beam relaxation in a thin magnetized plasma

2019

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In this paper, electromagnetic emissions produced by a beam-plasma system are investigated using particlein-cell simulations for the particular case when the typical transverse size of both 100 keV electron beam and produced plasma channel is comparable to the radiation wavelength. The interest in this regime of beamplasma interaction is associated with highly efficient generation of electromagnetic waves near the plasma frequency harmonics that has been recently observed in laboratory experiments on the GOL-3 mirror trap. It has been found that the radiation power only from the vicinity of the doubled plasma frequency in these experiments can reach 1% of the total beam power. Subsequent theoretical and simulation studies have shown that the most likely candidate for explaining such efficient generation of electromagnetic radiation is the mechanism of a beam-driven plasma antenna based on the conversion of the most unstable plasma oscillations on a longitudinal density modulation of plasma ions. In this paper, we investigate how effectively this mechanism can work in a real experiment at the GOL-3 facility, when a thin sub-relativistic electron beam gets a large angular spread due to compression by a magnetic field, and the gas into which it is injected has macroscopic density gradients.

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“…The principal possibility to reach such a high radiation efficiency (1%-2% near the second harmonic) in a beamplasma system has been recently demonstrated in laboratory experiments with a 100 keV, 10 MW electron beam at the GOL-3 mirror trap [10][11][12]. The main feature of these experiments is a small transverse size of the electron beam which has been chosen comparable with the radiation wavelength.…”

Section: Introductionmentioning

confidence: 99%

Second harmonic electromagnetic emission in a beam-driven plasma antenna

Annenkov

Berendeev

Volchok

et al. 2019

Plasma Phys. Control. Fusion

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Generation of electromagnetic radiation near the second harmonic of the plasma frequency during the injection of an electron beam into a rippled-density plasma channel is investigated using both analytical theory and particle-in-cell simulations. The generating scheme is based on nonlinear interaction of the most unstable beam-driven potential plasma wave with its satellite arising due to scattering on the longitudinal modulation of plasma density. Resulting superluminal oscillations of electric current in a finite-size plasma channel radiate electromagnetic waves via the same mechanism which has been recently studied for the fundamental harmonic emission and reffered as a beamdriven plasma antenna. It is shown that theoretical predictions for the optimal plasma width and modulation period are confirmed by simulation results and the power conversion efficiency of the second harmonic emission reaches several percent. Such an efficient mechanism opens the path to explanation of laboratory experiments with a thin electron beam at the GOL-3 mirror trap as well as to developing the scheme of terahertz generation at the gigawatt power level.

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MM-wave emission by magnetized plasma during sub-relativistic electron beam relaxation

Cited by 14 publications

References 19 publications

Simulations of electromagnetic emission from colliding laser wakefields

Simulations of electromagnetic emission from colliding laser wakefields

Highly efficient electromagnetic emission during 100 keV electron beam relaxation in a thin magnetized plasma

Second harmonic electromagnetic emission in a beam-driven plasma antenna

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