High-Gain Wide-Band Gyrotron Traveling Wave Amplifier with a Helically Corrugated Waveguide

Abstract

First bandwidth measurements of a novel gyrotron amplifier are presented. The coupling between the second harmonic cyclotron mode of a gyrating electron beam and the radiation field occurred in the region of near infinite phase velocity over a broad bandwidth by using a cylindrical waveguide with a helical corrugation on its internal surface. With a beam energy of 185 keV, the amplifier achieved a maximum output power of 1.1 MW, saturated gain of 37 dB, linear gain of 47 dB, saturated bandwidth of 8.4 to 10.4 GHz ( 21% relative bandwidth), and an efficiency of 29%, in good agreement with theory.

Development of gyrotron traveling-wave tubes at IAP and GYCOM

“…The operating helicalwaveguide eigenmode has sufficiently high and almost constant group velocity at zero axial wavenumber which enables broadband operation of the helical-waveguide gyro-TWT with minimum sensitivity to electron velocity spread [3]. A number of experiments have proved the main theoretical predictions and advantages of gyroTWTs of this type [4][5][6].…”

Input coupling systems for mm-wave amplifiers

“…Gyrotron travelling wave amplifiers (gyro-TWAs) [1][2][3] are coherent microwave radiation sources based on the cyclotron resonance mater instability. They have promising applications in telecommunication, RADAR, plasma diagnostics, electron paramagnetic resonance (EPR) and so on due to its high power and broadband capabilities.…”

Measurement of a W-band output launcher system for a broadband gyro-TWA

“…The gyro-TWA has many components which have to have low reflection over a broad bandwidth including: the input coupler [4], Bragg reflector [5]. microwave polarizer [6], interaction region [7], output horn and microwave window {Can you insert a ABP conference paper here, please ask LZ}. For many applications it is preferable to have the microwave output microwave in the form of a Gaussian beam.…”