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

2010 ◽  
Vol 17 (5) ◽  
pp. 053106 ◽  
Author(s):  
Saeed Mirzanejhad ◽  
Farshad Sohbatzadeh ◽  
Maede Ghasemi ◽  
Zeinab Sedaghat ◽  
Zeinab Mahdian
Keyword(s):  
Electron Beam ◽  
Ion Channel ◽  
Relativistic Electron ◽  
Electromagnetic Waves ◽  
Relativistic Electron Beam ◽  
Dispersion Characteristics

Space-charge waves in a relativistic electron beam with ion-channel guiding

2010 ◽  
Vol 77 (3) ◽  
pp. 419-429 ◽  
Author(s):  
SAEED MIRZANEJHAD ◽  
BEHROUZ MARAGHECHI ◽  
FARSHAD SOHBATZADEH ◽  
IMAN KAMEL-JAHROMI
Keyword(s):  
Electron Beam ◽  
Eigenvalue Problem ◽  
Ion Channel ◽  
Space Charge ◽  
Relativistic Electron ◽  
Relativistic Electron Beam ◽  
Field Energy ◽  
Dispersion Characteristics ◽  
Perfect Agreement ◽  
Space Charge Waves

AbstractSpace-charge waves in a relativistic electron beam that completely fills a cylindrical metallic waveguide and is guided by an ion channel are analyzed numerically. Equilibrium consists of a uniform and rigid rotation without betatron oscillations. Using cold fluid equations a differential equation and boundary conditions are derived that constitute an eigenvalue problem. This eigenvalue problem is solved, numerically, with the finite difference scheme using shooting method. Dispersion characteristics and electrostatic potential structures of azimuthally symmetric and nonsymmetric space-charge waves are studied. Perfect agreement with analytical results at asymptotic limit of zero axial velocity is found. It was found that relativistic effects modify the dispersion characteristics of the space-charge waves considerably and can concentrate the electric field energy of the wave into a thin and small shell around the axis.

Instability of electromagnetic waves with radial polarization in a rotating relativistic electron beam guided by ion channel

2011 ◽  
Vol 78 (1) ◽  
pp. 25-31 ◽  
Author(s):  
SAEED MIRZANEJHAD ◽  
FARSHAD SOHBATZADEH ◽  
ZAHRA HEIDARI
Keyword(s):  
Electron Beam ◽  
Ion Channel ◽  
Relativistic Electron ◽  
Electromagnetic Waves ◽  
Relativistic Electron Beam ◽  
Radial Polarization ◽  
High Intensity Laser ◽  
Charge Wave ◽  
Intensity Laser ◽  
Space Charge Wave

AbstractDispersion characteristics of electromagnetic waves with radial and azimuthal polarization in a rotating relativistic electron beam guided by an ion channel are investigated. Ion-channel electrostatic field and self-fields of relativistic electron beam were included in the formalism. It is shown that the wave with radial polarization is unstable in two regions due to coupling with fast space charge wave. The behaviors of the instability magnitude and spread are analyzed as a function of equilibrium parameters. The introduced instability can be used for amplification and production of high-intensity laser pulse with radial polarization.

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