Title :
Gain broadening in an inhomogeneous gyrotron traveling wave amplifier
Author :
Park, G.S. ; Park, S.Y. ; Kyser, R.H. ; Ganguly, A.K. ; Armstrong, C.M.
Author_Institution :
Omega P Inc., New Haven, CT, USA
Abstract :
A wideband low-voltage millimeter-wave gyrotron traveling-wave amplifier (gyro-TWT) that incorporates precise axial tapering on both the magnetic field and the interaction circuit for broadband operation is discussed. The amplifier operates in the TE/sub 10/ rectangular waveguide mode at the fundamental cyclotron frequency at a beam voltage of 33 kV and a beam current of 1.6 A. By using an electron beam with an alpha of around 0.6, small signal gain in excess of 16 dB is observed over a wide instantaneous frequency range (33%, 27-38 GHz), in good agreement with theory. Work on the large signal characterization of the amplifier is reported. Nonlinear calculations indicate saturated gains of around 16 dB with approximately 30% bandwidth and 10% efficiency.<>
Keywords :
gyrotrons; microwave amplifiers; rectangular waveguides; travelling-wave-tubes; 1.6 A; 10 percent; 16 dB; 27 to 38 GHz; 33 kV; TE/sub 10/ rectangular waveguide mode; axial tapering; broadband operation; fundamental cyclotron frequency; inhomogeneous gyrotron traveling wave amplifier; interaction circuit; large signal characterization; magnetic field; millimeter-wave; saturated gains; small signal gain; Broadband amplifiers; Frequency; Gyrotrons; Magnetic circuits; Magnetic fields; Millimeter wave circuits; Operational amplifiers; Rectangular waveguides; Tellurium; Waveguide theory;
Conference_Titel :
Electron Devices Meeting, 1990. IEDM '90. Technical Digest., International
Conference_Location :
San Francisco, CA, USA
DOI :
10.1109/IEDM.1990.237103
