Features of relativistic electron beam–plasma interaction under high beam current

Karbushev, N. I.; Rostomyan, E.V.

doi:10.1016/j.physleta.2008.04.042

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The transformation of the single particle Cherenkov Effect to that of collective type takes place in case of weak coupling as well as in very high beam currents when it exceeds limiting current in a vacuum waveguide. The oscillations of over-limiting electron beams reveal themselves significantly for both weak and strong coupling, and the beam-plasma instability is due to the growth of NEBW [2][3][9][10][11]. The only condition for this is that the beam-plasma waveguide should be non-uniform in its cross section.…”

Section: Introductionmentioning

confidence: 99%

Dissipative instability under weak beam–plasma coupling

Rostomyan¹

2012

J. Plasma Phys.

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Beam-plasma interaction is investigated in a model of plasma microwave oscillator: waveguide with spatially separated plasma and beam layers of finite thicknesses. Investigation is carried out in general form without specifying shape of the waveguide in cross section. Approach is based on perturbation theory over wave coupling. Spatial separation implies weak beam-plasma interaction that exhibits many specific features. Developing instability is caused by the growth of the negative energy beam wave. It is shown that upon weak coupling presence, dissipation leads to a new type of dissipative beam instability. Its maximal growth rate is inversely proportional to collision frequency in plasma. The growth rate of this instability is obtained for an arbitrary level of dissipation. Basic parameters of instability show that its properties cannot be neglected upon design of high-power, high-frequency plasma-filled generators/amplifiers based on relativistic e-beams.

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Section: Introductionmentioning

confidence: 99%

Dissipative instability under weak beam–plasma coupling

Rostomyan¹

2012

J. Plasma Phys.

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“…Through the preliminary analysis and the contrast between the vacuum diode and the plasma filled device, it is hard to completely imitate the existing theory to explain the radiation mechanism of the vacuum diode. The plasma is not a passive medium, and there will be interaction between the electron beam and the plasma [5,6]. The interaction will lead to variety instabilities [7][8][9], and it will make the mechanism of radiation become more complex [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Mechanism analysis of radiation generated by the beam-plasma interaction in a vacuum diode

(季曾超)¹,

Shixiu²,

Gao³

2016

Plasma Sci. Technol.

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When we were studying the vacuum switch, we found that the vacuum diode can radiate a broadband microwave. The vacuum diode is comprised of a cathode with a trigger device and planar anode, there is not a metallic bellows waveguide structure in this device, so the radiation mechanism of the vacuum diode is different from the plasma filled microwave device. It is hard to completely imitate the theory of the plasma filled microwave device. This paper analyzes the breakdown process of the vacuum diode, establishes the mathematical model of the radiating microwave from the vacuum diode. Based on the analysis of the dispersion relation in the form of a refractive index, the electromagnetic waves generated in the vacuum diode will resonate. The included angle between the direction of the electromagnetic radiation and the initial motion direction of electron beam is 45 degrees. The paper isolates the electrostatic effect from the beam-plasma interaction when the electromagnetic radiation occurs. According to above analyses, the dispersion relations of radiation are obtained by solving the wave equation. The dispersion curves are also obtained based on the theoretical dispersion relations. The theoretical dispersion curves are consistent with the actual measurement time-frequency maps of the radiation. Theoretical deduction and experiments indicate that the reason for microwave radiating from the vacuum diode can be well explained by the interaction of the electron beam and magnetized plasma.

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Dissipative instability under weak beam–plasma coupling in finite magnetic field

Rostomyan¹

2009

Physics Letters A

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Features of relativistic electron beam–plasma interaction under high beam current

Cited by 5 publications

References 11 publications

Dissipative instability under weak beam–plasma coupling

Dissipative instability under weak beam–plasma coupling

Mechanism analysis of radiation generated by the beam-plasma interaction in a vacuum diode

Dissipative instability under weak beam–plasma coupling in finite magnetic field

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