Well-directed flux of megawatt sub-mm radiation generated by a relativistic electron beam in a magnetized plasma with strong density gradients

Аржанников, А. В.; Иванов, И. А.; Kasatov, A. A.; Kuznetsov, S. A.; Макаров, М. А.; Mekler, K. I.; Polosatkin, S. V.; Попов, С. С.; Rovenskikh, A. F.; Samtsov, Denis A.; Sinitsky, S. L.; Степанов, В. Д.; Annenkov, V. V.; Тимофеев, И. В.

doi:10.1088/1361-6587/ab72e3

Cited by 34 publications

(23 citation statements)

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“…For efficient excitation of large-amplitude plasma waves, either short laser pulses or relatively long electron beams can be applied. Further transformation of these waves into EM oscillations at the plasma frequency can be realized via the linear mode conversion assuming the presence of density gradients [25][26][27] or an external magnetic field [28][29][30]. On the other hand, plasma waves can participate in various nonlinear processes generating radiations at higher harmonics.…”

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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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: 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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“…Г. И. Будкера СО РАН. Недавние эксперименты [15] на этой установке показали, что электромагнитное излучение вблизи плазменной частоты (150-200 ГГц) генерируется преимущественно вдоль ведущего магнитного поля, а его мощность возрастает в 10-30 раз, если в плазме предварительно создается сильно неоднородный радиальный профиль плотности. Полная мощность излучения в режиме с сильными поперечными градиентами плотности плазмы оценивается на уровне 4 МВт.…”

Section: Introductionunclassified

“…1. Радиальный профиль плотности плазмы: точки -результаты экспериментальных измерений из работы [15], штрихованная линия -аппроксимация периодической функцией n/n 0 = 1 + 0,5cos(2πr/L), где n 0 = 5,5 · 10 14 см −3 , L = 9,06 мм Fig. 1.…”

Section: Introductionunclassified

“…1. Radial profile of plasma density: the points -results of experimental measurements from the paper [15], the dashed line -approximation by the periodic function / 0 = 1 + 0.5 cos(2 / ), where 0 = 5.5 · 10 14 сm −3 , = 9.06 mm В данной работе для изучения основных особенностей развития пучковой неустойчивости в сильно неоднородной плазме и генерации ЭМ излучения на гармониках плазменной частоты в этих условиях используется численное моделирование на основе метода частиц в ячейках (Particle In Cell, PIC). PIC моделирование проводится для тех значений относительной плотности пучка и пространственного масштаба поперечной неоднородности, которые были реализованы в пучково-плазменном эксперименте [15], что позволяет проводить сравнение с его результатами.…”

Section: Introductionunclassified

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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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“…In laboratory conditions, similar processes of electromagnetic emission from a plasma under the injection of weakly relativistic electron beams (from 100 keV to 1 MeV) are presently studied in experiments at the GOL-PET facility (BINP SB RAS) (Ivanov et al 2015;Arzhannikov et al 2016Arzhannikov et al , 2020. Although the main goal of these experiments is the search for efficient regimes of beam-to-radiation power conversion suitable for creation of a high-power THz source, the GOL-PET facility is also used as a test bed for proving fundamental theoretical insights on the physics of electromagnetic emission from a turbulent beam-plasma system (Arzhannikov & Timofeev 2012;Timofeev et al 2015;Annenkov et al 2016bAnnenkov et al , 2019.…”

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confidence: 99%

Electromagnetic Emission Produced by Three-wave Interactions in a Plasma with Continiously Injected Counterstreaming Electron Beams

Annenkov,

Volchok,

Timofeev

2020

Preprint

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Three-wave interactions between Langmuir and electromagnetic waves in plasma with unstable electron flows are believed to be the main cause for type II and III solar radio emissions. The narrow band of type II bursts requires to assume that this radiation is generated in some local regions of shock fronts traveling in the solar corona, where the specific conditions for the enhancement of electromagnetic emissions near the plasma frequency harmonics are created. The reason for such enhancement at the second harmonic may be the formation of counter-streaming electron beams. There are different opinions in literature on whether the second harmonic electromagnetic emission in the presence of an additional beam can be efficient enough to markedly dominate emissions produced by a single beam. In the present paper, we carry out particle-in-cell simulations of the collision of two symmetric electron beams in plasma with open boundary conditions and show that the efficiency of beam-to-radiation power conversion can be significantly increased compared to models with periodic boundary conditions and reach the level of a few percent if three-wave interactions with electromagnetic waves near the second harmonic of the plasma frequency becomes available for the most unstable oblique beam driven modes.

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Well-directed flux of megawatt sub-mm radiation generated by a relativistic electron beam in a magnetized plasma with strong density gradients

Cited by 34 publications

References 50 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

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

Electromagnetic Emission Produced by Three-wave Interactions in a Plasma with Continiously Injected Counterstreaming Electron Beams

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