High-power terahertz emission from a plasma penetrated by counterstreaming different-size electron beams

Annenkov, V. V.; Berendeev, Evgeny; Тимофеев, И. В.; Volchok, E. P.

doi:10.1063/1.5048245

Cited by 23 publications

(21 citation statements)

References 26 publications

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“…To sim- ulate generation of 2𝜔 𝑝 -radiation by colliding wakes, we use a standard 2D3V particle-in-cell code. Its descrip-tion can be found, for example, in the paper [39]. The layout of the simulation box is shown in Figure 9.…”

Section: Numerical Simulationsmentioning

confidence: 99%

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Electromagnetic emission due to nonlinear interaction of laser wakefields colliding in plasma at an oblique angle

Volchok,

Annenkov,

Timofeev

2020

Preprint

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Head-on collision of laser-induced plasma wakefields with differing profiles of electrostatic potential has been recently found to be an efficient mechanism for generating high-power electromagnetic emission at the second harmonic of the plasma frequency [I. V.Timofeev et al. Phys. Plasmas 24, 103106 (2017)]. This mechanism is attractive for creating a source of tunable narrow-band coherent radiation in the terahertz frequency range. In this paper, we generalize the theory of electromagnetic emission produced by nonlinear interaction of two plasma wakes to the case of an arbitrary collision angle. Such a theory is used to evaluate the angular distribution of the second harmonic radiation as well as its total generation efficiency for parameters of the proof-of-principle experiment in which laser axes will be aligned with a small finite angle. Theoretical predictions are qualitatively confirmed by particle-in-cell simulations.

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Section: Numerical Simulationsmentioning

confidence: 99%

“…A distinctive feature of the proposed mechanism is that the role of drivers of colliding plasma waves can be played not only by short laser pulses, but also by long-pulse electron beams unstable against the two-stream instability [39]. Both generating schemes have their advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic emission due to nonlinear interaction of laser wakefields colliding in plasma at an oblique angle

Volchok,

Annenkov,

Timofeev

2020

Preprint

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“…If any plasma particle goes beyond the edge of plasma column in the longitudinal direction, it is removed from the simulation. A more detailed description of the open boundary conditions and absorbing layers implemented in this code can be found in 42 .…”

Section: A Simulation Layoutmentioning

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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“…Это предполагает использование специальных буферов, в которых поддерживаются заданные распределения частиц пучка и плазмы по импульсу. Подробное описание соответствующего алгоритма можно найти в работе [20].…”

Section: Pic модельunclassified

Computer Simulations of Electromagnetic Emissions Produced via Injection of Electron Beam into a Plasma with Strong Transverse Density Gradients

Glinskiy

Тимофеев

Annenkov

et al. 2019

SJPhys

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Recent experiments on the injection of kiloampere electron beams into a magnetized plasma at the GOL-PET facility have shown that the power of sub-terahertz radiation escaping from the plasma along the magnetic field increases by more than an order of magnitude if strong transverse density gradients are preliminarily created in the plasma. In this paper, the influence of transverse in homogeneities of plasma density on the efficiency of electromagnetic radiation generation near the harmonics of the plasma frequency is studied using particle-in-cell simulations. Simulations performed for the real relative density of the beam and the real spatial scales of the in homogeneity show that the beam instability develops only in the density wells, and the small transverse size of its localization comparable with the wavelength contributes to a more efficient conversion of unstable oscillations into electromagnetic ones. Despite the fact that radiation at the plasma frequency is blocked across the leading magnetic field, it can leave the generation region with the decrease of the plasma density in the longitudinal direction.

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High-power terahertz emission from a plasma penetrated by counterstreaming different-size electron beams

Cited by 23 publications

References 26 publications

Electromagnetic emission due to nonlinear interaction of laser wakefields colliding in plasma at an oblique angle

Electromagnetic emission due to nonlinear interaction of laser wakefields colliding in plasma at an oblique angle

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

Computer Simulations of Electromagnetic Emissions Produced via Injection of Electron Beam into a Plasma with Strong Transverse Density Gradients

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