Beam-plasma system as a source of powerful submillimeter and terahertz radiation (experimental and theoretical studies)

Аржанников, А. В.; Annenkov, V. V.; Burdakov, A. V.; Burmasov, V. S.; Иванов, И. А.; Kasatov, A. A.; Kuznetsov, S. А.; Макаров, М. А.; Mekler, K. I.; Polosatkin, S. V.; Поступаев, В. В.; Rovenskikh, A. F.; Sinitsky, S. L.; Sklyarov, V. F.; Stepanov, V. D.; Тимофеев, И. В.; Thumm, M.

doi:10.1063/1.4964228

Cited by 5 publications

(5 citation statements)

References 7 publications

(15 reference statements)

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“…IV). The first problem can be interesting for designing a powerful terahertz radiation source, the second one is crucial for interpreting the experimental results from the GOL-3 facility [12].…”

Section: Introductionmentioning

confidence: 99%

“…In the present paper, we study the steady-state injection of relativistic electron beam into the magnetized plasma with the electromagnetic 2D3V PIC code. 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%

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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%

Section: Introductionmentioning

confidence: 99%

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

2016

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“…Measurements of the emission in the longitudinal direction have shown that the spectral power density of this radiation is concentrated in two clear distinct frequency regions as it was demonstrated in the measurements of the emission in transverse direction (see [3]). For the plasma density of 1 10 15 см -3 , the first region is located in the frequency interval f 1 =0.25-0.35 THz, the second one is in the interval f 2 =0.6-0.8 THz.…”

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confidence: 59%

Study of 0.3-0.8 THz flux generated by magnetized plasma column due to relaxation of high-current REB

et al. 2017

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Studies on submm-wave emission from magnetized plasma due to relaxation of a high current relativistic electron beam (REB) are considerably important since they allow generating the high-power radiation with a prompt tuning frequency [1,2]. The experimental results were obtained at GOL-PET device (see fig.1). We study the relaxation of the high-power REB (0.8 MeV/ 10kA/ 10 μs) in a plasma column of 2 meters length with the density n p = (0.5 2) 10 15 см -3 confined by the multiplemirror magnetic field with the mean value B mean = 4.2 T and the corrugation factor 1.5. The aim of the experiments is to find the conditions for the efficient conversion of plasma waves into electromagnetic ones. The recent experiments have been focused on the study of the properties of 0.2 -0.8 THz radiation propagating along the axis of the plasma column.The temporal dynamics of the radiation spectra was measured along the axis by an 8-channel polychromator with semiconductor diodes for the frequency interval from 0.1 up to 0.5 THz (see [2]) and by an additional 2-channel cryogen detection system and single semiconductor diodes covered by narrow band-pass quasi-optical filters for the 0.5-0.9 THz frequency range. During the spectral measurements, the plasma density was measured in eight dots over the diameter of the plasma column via the Thomson scattering system with a 50 ns laser pulse. As an example of the results of such measurements by the Thomson scattering system, the density distribution over the plasma column diameter is presented in fig.2 for the shot t1913.The temporal evolution of beam and plasma parameters and the signals of the emission for the frequencies 0.26 THz and 0.64 THz are presented in fig. 3 for the same shot.Measurements of the emission in the longitudinal direction have shown that the spectral power density of this radiation is concentrated in two clear distinct frequency regions as it was demonstrated in the measurements of the emission in transverse direction (see [3]). For the plasma density of 1 10 15 см -3 , the first region is located in the frequency interval f 1 =0.25-0.35 THz, the second one is in the interval f 2 =0.6-0.8 THz. As one can see in fig. 4 presenting the spectrum of the emission for the shot t1913, one of the peaks of the spectral power density is located at the frequency f 1 =0.2 THz and the second one at f 1 =0.64 THz.

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“…Generation of electromagnetic (EM) radiation in a plasma by an electron beam has long attracted attention of researchers in relation to both astrophysical phenomena [1][2][3] and laboratory experiments [4][5][6][7] . Currently, interest in this problem is associated with the study of type II and type III solar radio bursts [8][9][10][11][12] and zebra-like fine spectral structures of solar radiation 13,14 , as well as with the search for promising schemes for generating high-power sub-THz and THz radiation in mirror traps [15][16][17][18] . Since open magnetic systems allow to inject multigigawatt electron beams, the conversion of even a small fraction of their power into radiation power (1-5%) would open up the possibility of generating THz pulses at the record gigawatt level.…”

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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Beam-plasma system as a source of powerful submillimeter and terahertz radiation (experimental and theoretical studies)

Cited by 5 publications

References 7 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

Study of 0.3-0.8 THz flux generated by magnetized plasma column due to relaxation of high-current REB

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

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