Two-Beam Instability for THz Radiation Source

Theoretical study and digital calculations on the two beams instability in a cylindrical waveguide by a finite axial magnetic field for THz radiation source have been given in the paper. In our approach the electron beams are considered the moving non-neutralized plasma and the surface current due to the ripple of electron beams are taken into consideration in the analysis of beam-wave interactions. With the boundary conditions, the dispersion equation was obtained and solved numerically. The results show that under certain conditions, THz radiation may be achieved.