Title :
Cyclotron resonance maser experiment in a nondispersive waveguide
Author :
Jerby, Eli ; Shahadi, Avi ; Drori, Rami ; Korol, Michael ; Einat, Moshe ; Sheinin, Marat ; Dikhtiar, Vladimir ; Grinberg, Vladimir ; Bensal, Moshe ; Harhel, Tal ; Baron, Yitzchak ; Fruchtman, Amnon ; Granatstein, Victor L. ; Bekefi, George
Author_Institution :
Fac. of Eng., Tel Aviv Univ., Israel
fDate :
6/1/1996 12:00:00 AM
Abstract :
A cyclotron-resonance maser (CRM) oscillator experiment in which a spiraling electron beam interacts with a transverse electromagnetic wave in a nondispersive waveguide is presented. The experiment employs a low-energy (<5 keV) low-current (<1 A) electron beam in a two-wire (Lecher type) waveguide. The microwave output frequency is tuned in this experiment by the axial magnetic field in the range 3.5-6.0 GHz. A second harmonic emission is observed at ~7 GHz. CRM theory shows that in a free-space TEM-mode interaction, the gain might be canceled due to the equal and opposite effects of the axial (Weibel) and the azimuthal bunching mechanisms. This balance is violated in the large transverse velocity regime (V⊥≫Vz) in which our experiment operates. The tunability measurements of the CRM oscillator experiment in the nondispersive waveguide are discussed in view of the CRM theory
Keywords :
cyclotron masers; electron beams; microwave tubes; millimetre wave oscillators; 1 A; 3.5 to 6.0 GHz; 5 keV; 7 GHz; axial Weibel bunching mechanism; axial magnetic field; azimuthal bunching mechanism; cyclotron-resonance maser oscillator; free-space TEM-mode interaction; low-energy low-current electron beam; microwave output frequency; nondispersive waveguide; second harmonic emission; spiraling electron beam; transverse electromagnetic wave; two-wire Lecher type waveguide; Cyclotrons; Electromagnetic scattering; Electromagnetic waveguides; Electron beams; Frequency; Magnetic fields; Masers; Microwave oscillators; Resonance; Waveguide theory;
Journal_Title :
Plasma Science, IEEE Transactions on
