Strong Langmuir turbulence driven by an intense relativistic electron beam

Masuzaki, M.; Ando, R.; Yoshikawa, Masayuki; Koguchi, Haruhisa; Hamada, Y.; Miyajima, Kensuke; Ikeda, Aya; Takahata, S.; Yoshida, Hiroaki; Kamada, K.

doi:10.1063/1.50407

Cited by 2 publications

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“…The radiation has been found to be emitted only when the density ratio is between about 0.0055 and 0.11 with a peak at around 0.02 [12], [16], and the beam modulation has almost the same dependence on as the radiation [16]. The density modulation of the IREB is believed to be due to the interaction of the IREB with the background waves.…”

Section: E Explanation Of the Experimentally Observed Density-ratio mentioning

confidence: 98%

“…The density modulation of the IREB is believed to be due to the interaction of the IREB with the background waves. It has been found that the radiation is emitted only when the density ratio of the beam to the filled plasma is between about 0.005-0.1 with a peak at around 0.02 [12], [16], and that the level of the IREB modulation has almost the same dependence on this density ratio [16].…”

Section: W Hen An Intense Relativistic Electron Beam (Ireb)mentioning

confidence: 99%

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The dependence of microwave radiation from a beam-driven turbulent plasma on the beam-to-plasma density ratio

Toyosugi

Masuzaki

Ando

et al. 2002

IEEE Trans. Plasma Sci.

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When an intense relativistic electron beam is injected into an unmagnetized plasma, the plasma develops into a strong Langmuir turbulence state, and high-power broadband microwave radiation is emitted. The emission source has been confirmed to be the modulated beam interacting with the caviton fields. Total power of this radiation depends on the beam-to-plasma density ratio almost in the same way as the level of the beam modulation. The present paper indicates that by performing two and a half-dimensional particle-in-cell simulations, this dependence comes from the dependence of activity of the beam electron-plasma electron two-stream instability on the beam-to-plasma density ratio.Index Terms-Beam modulation, intense relativistic electron beam, microwave radiation, particle-in-cell (PIC) method, strong Langmuir turbulence.

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Section: E Explanation Of the Experimentally Observed Density-ratio mentioning

confidence: 98%

Section: W Hen An Intense Relativistic Electron Beam (Ireb)mentioning

confidence: 99%

The dependence of microwave radiation from a beam-driven turbulent plasma on the beam-to-plasma density ratio

Toyosugi

Masuzaki

Ando

et al. 2002

IEEE Trans. Plasma Sci.

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Mechanism for fast radio bursts

2016

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Fast radio bursts are mysterious transient sources likely located at cosmological distances. The derived brightness temperatures exceed by many orders of magnitude the self-absorption limit of incoherent synchrotron radiation, implying the operation of a coherent emission process. We propose a radiation mechanism for fast radio bursts where the emission arises from collisionless Bremsstrahlung in strong plasma turbulence excited by relativistic electron beams. We discuss possible astrophysical scenarios in which this process might operate. The emitting region is a turbulent plasma hit by a relativistic jet, where Langmuir plasma waves produce a concentration of intense electrostatic soliton-like regions (cavitons). The resulting radiation is coherent and, under some physical conditions, can be polarised and have a power-law distribution in energy. We obtain radio luminosities in agreement with the inferred values for fast radio bursts. The timescale of the radio flare in some cases can be extremely fast, of the order of 10 −3 s. The mechanism we present here can explain the main features of fast radio bursts and is plausible in different astrophysical sources, such as gamma-ray bursts and some Active Galactic Nuclei.

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Strong Langmuir turbulence driven by an intense relativistic electron beam

Cited by 2 publications

References 0 publications

The dependence of microwave radiation from a beam-driven turbulent plasma on the beam-to-plasma density ratio

The dependence of microwave radiation from a beam-driven turbulent plasma on the beam-to-plasma density ratio

Mechanism for fast radio bursts

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