Cherenkov electromagnetic instability excited by an oscillating relativistic electron beam in ion channel

Wang, Zhenyu; Tang, C. J.; Peng, Xiaodong

doi:10.1063/1.3464470

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…In recent years, much effort has been expended in the investigation of ion-channel pumped FELs [9][10][11][12][13]. The technique of ion-channel guiding has emerged as an effective method for focusing the electron beam; a relativistic e-beam injected into an underdense plasma (the plasma density is less than the beam density) can expel the plasma electrons outward to create an ion-channel, which has ideal focusing properties for e-beams.…”

Section: Introductionmentioning

confidence: 99%

Free-electron laser with a plasma wave wiggler propagating through a magnetized plasma channel

Jafari¹,

Jafarinia²,

Mehdian³

2013

Laser Phys.

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A plasma eigenmode has been employed as a wiggler in a magnetized plasma channel for the generation of laser radiation in a free-electron laser. The short wavelength of the plasma wave allows a higher radiation frequency to be obtained than from conventional wiggler free-electron lasers. The plasma can significantly slow down the radiation mode, thereby relaxing the beam energy requirement considerably. In addition, it allows a beam current in excess of the vacuum current limit via charge neutralization. This configuration has a higher tunability by controlling the plasma density in addition to the γ-tunability of the standard FEL. The laser gain has been calculated and numerical computations of the electron trajectories and gain are presented. Four groups (I–IV) of electron orbits have been found. It has been shown that by increasing the cyclotron frequency, the gain for orbits of group I and group III increases, while a decrease in gain has been obtained for orbits of group II and group IV. Similarly, the effect of plasma density on gain has been exhibited. The results indicate that with increasing plasma density, the orbits of all groups shift to higher cyclotron frequencies. The effects of beam self-fields on gain have also been demonstrated. It has been found that in the presence of beam self-fields the sensitivity of the gain increases substantially in the vicinity of gyroresonance. Here, the gain enhancement and reduction are due to the paramagnetic and diamagnetic effects of the self-magnetic field, respectively.

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Section: Introductionmentioning

confidence: 99%

Free-electron laser with a plasma wave wiggler propagating through a magnetized plasma channel

Jafari¹,

Jafarinia²,

Mehdian³

2013

Laser Phys.

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“…In previous works, the high frequency azimuthally symmetrical and nonsymmetrical eigenmodes in a REB with ion-channel guiding have been analyzed by Rouhani et al [15,16]. Wang et al have studied the dispersion relations of EM waves in beam-ion channel system and the mechanism of Cherenkov EM instability [17,18]. Mirzanejhad et al have presented the dispersion characteristics of the space charge waves in a uniform and rigid rotation REB in ion channel without betatron oscillations [19].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Waves Dispersion and Interaction of an Annular Beam-Ion Channel System in Plasma Waveguide

Jixiong

Wang

Liu

2017

Advances in Mathematical Physics

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A linear theory for the electromagnetic properties and interactions of an annular beam-ion channel system in plasma waveguide is presented. The dispersion relations for two families of propagating modes, including the electrostatic and transverse magnetic modes, are derived. The dependencies of the dispersion behavior and interaction for different wave modes on the thickness of the annular beam and betatron oscillation frequency are studied in detail by numerical calculations. The results show that the inner and outer radii of the beam have different influences on propagation properties of the electrostatic and electromagnetic modes with different betatron oscillation parameters. In the weak ion channel situation, the two types of electrostatic waves, that is, space charge and betatron modes, have no interaction with the transverse magnetic modes. However, in the strong ion channel situation, the transverse magnetic modes will have two branches and a low frequency mode emerged as the new branch. In this case, compared with the solid beam case, the betatron modes not only can interact with the high frequency branch at small wavenumber but also can interact with the low frequency branch at large wavenumber.

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Plasma-based multistage virtual cathode radiation

Tang

2011

Physics of Plasmas

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A plasma-based multistage virtual cathode radiation is proposed. Multistage virtual cathode can be formed as an electron beam passes through a high dense ion background. The reflected electrons can be coupled with transverse magnetic wave, and electromagnetic radiation is detected. Unlike the traditional virtual cathode devices, the beam current can be decreased greatly due to the effect of ions, and single mode operation can be achieved by adjusting the beam density. Besides, the radiation frequency, which is proportional to the beam density, covers from 10 to 100 GHz. The output power flux density reaches a magnitude of GWm−2.

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Cherenkov electromagnetic instability excited by an oscillating relativistic electron beam in ion channel

Cited by 8 publications

References 24 publications

Free-electron laser with a plasma wave wiggler propagating through a magnetized plasma channel

Free-electron laser with a plasma wave wiggler propagating through a magnetized plasma channel

Electromagnetic Waves Dispersion and Interaction of an Annular Beam-Ion Channel System in Plasma Waveguide

Plasma-based multistage virtual cathode radiation

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