Dispersion characteristics of the electromagnetic waves in a relativistic electron beam guided by the ion channel

Mirzanejhad, Saeed; Sohbatzadeh, Farshad; Ghasemi, Maede; Sedaghat, Zeinab; Mahdian, Zeinab
May 2010
Physics of Plasmas;May2010, Vol. 17 Issue 5, p053106
Academic Journal
In this article, the dispersion characteristics of the paraxial (near axis) electromagnetic (EM) waves in a relativistic electron beam guided by the ion channel are investigated. Equilibrium fields such as ion-channel electrostatic field and self-fields of relativistic electron beam are included in this formalism. In accordance with the equilibrium field structure, radial and azimuthal waves are selected as base vectors for EM waves. It is shown that the dispersion of the radially polarized EM and space charge waves are influenced by the equilibrium fields, but azimuthally polarized wave remain unaffected. In some wave number domains, the radially polarized EM and fast space charge waves are coupled. In these regions, instability is analyzed as a function of equilibrium structure. It is shown that the total equilibrium radial force due to the ion channel and electron beam and also relativistic effect play a key role in the coupling of the radially polarized EM wave and space charge wave. Furthermore, some asymptotic behaviors such as weak and strong ion channel, nonrelativistic case and cutoff frequencies are discussed. This instability could be used as an amplification mechanism for radially polarized EM waves in a beam-plasma system where a relativistic electron beam is guided by the ion channel.


Related Articles

  • Radiative leakage of space-charge waves by a modulated thin-sheet electron beam propagating parallel to a reflection grating. Yasumoto, K.; Tanaka, T. // Journal of Applied Physics;11/1/1987, Vol. 62 Issue 9, p3543 

    Presents a study that investigated a two-dimensional radiation by a modulated thin-sheet electron beam, which propagates parallel to a reflection grating composed of a slightly corrugated conducting surface. Overview of research works on the application of a relativistic electron beam to new...

  • The instability in the radially non-uniform electron beam-ion channel system. Yang, S. P.; Zhou, Q.; Gong, Y. B.; Tang, C. J. // Physics of Plasmas;2015, Vol. 22 Issue 10, p1 

    The instability caused by the interaction among the electron beam, plasma, and electromagnetic (EM) waves in a radially non-uniform ion channel is studied. The dispersion relation of the interaction is derived in this paper. The study shows that the EM instability can be induced nearby the...

  • Free-electron laser harmonic generation in an electromagnetic-wave wiggler and ion channel guiding. Mehdian, H.; Hasanbeigi, A.; Jafari, S. // Physics of Plasmas;Feb2010, Vol. 17 Issue 2, p023112 

    A theoretical study of electron trajectories, harmonic generation, and gain in a free-electron laser (FEL) with a linearly polarized electromagnetic-wave wiggler is presented for axial injection of electron beam. The relativistic equation of motion for a single electron has been derived and...

  • The interaction of electromagnetic wave and plasma wave in an electron beam-ion channel system. Su, D.; Tang, C. J. // Physics of Plasmas;Feb2011, Vol. 18 Issue 2, p023104 

    The features of the waves and the instability induced by the interaction of electromagnetic (EM) wave with plasma wave in the electron beam-ion channel system are studied. Characteristics of waves in the system are displayed through the dispersion relation and two kinds of EM instabilities are...

  • Simulation of a prebunched free-electron laser with planar wiggler and ion channel guiding. Rouhani, M. H.; Maraghechi, B. // Physics of Plasmas;Feb2010, Vol. 17 Issue 2, p023104 

    A one-dimensional and nonlinear simulation of a free-electron laser with a prebunched electron beam, a planar wiggler, and ion-channel guiding is presented. Using Maxwell’s equations and full Lorentz force equation of motion for the electron beam, a set of coupled nonlinear differential...

  • Coherent terahertz radiation from interaction of electron beam with rippled density plasma. Pathak, Vishwa Bandhu; Dahiya, Deepak; Tripathi, V. K. // Journal of Applied Physics;Jan2009, Vol. 105 Issue 1, p013315 

    An alternative free electron laser concept for producing coherent terahertz radiation is investigated. A weakly relativistic electron beam impinged on a rippled underdense plasma, at an angle to the ripple wave vector, interacts with a seed terahertz signal to produce a space charge beam mode....

  • Diffuse plasma effects on the ion-hose instability. Welch, Dale R.; Hughes, Thomas P. // Physics of Fluids B: Plasma Physics;Feb93, Vol. 5 Issue 2, p339 

    The transverse stability of a relativistic electron beam focused by an ion channel in the presence of a diffuse background plasma is investigated. The linear behavior of the ion-hose and electron two-stream instabilities is treated analytically using a spread-mass model for the beam and ion...

  • Low-Frequency Electromagnetic Radiation Generated by Electron Beams in Gases. Alimov, G. R.; Muminov, A. T.; Muminov, T. M.; Salikhbaev, U. S.; Safarov, A. N.; Usmanov, R. R. // Technical Physics;Nov2002, Vol. 47 Issue 11, p1484 

    13-MeV electron beams are shown to generate low-frequency electromagnetic radiation in the gaseous medium of a 100-m-long dielectric electron pipe.

  • Efficiency scaling law for the two-stream amplifier. Chiping Chen // Physics of Plasmas;Aug96, Vol. 3 Issue 8, p3107 

    Investigates the mechanism of conversion from the kinetic energy of electron beams to electromagnetic wave energy in a two-stream amplifier. Optimal efficiency of the amplifier; Use of the kinetic power theorem to derive an analytical expression for the amount of radio frequency power...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics