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

Volume

24

Issue

3

fYear

1996

fDate

6/1/1996 12:00:00 AM

Firstpage

816

Lastpage

824

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_⊥≫V_z) 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;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.533084

Filename

533084