Title :
Study of a W-Band second-harmonic gyro-TWT amplifier
Author :
Li, Zhiliang ; Feng, Jinjun ; Wang, Efeng ; Liu, Bentian
Author_Institution :
Vacuum Electron. Nat. Lab., Beijing, China
Abstract :
The design of a W-Band gyro-TWT amplifier operating in the circular TE02 mode at the second cyclotron harmonic is presented. The interaction circuit in the design consisted of an two stage distributed-loss structure. Nonlinear analysis show that the amplifier can generate a saturated peak power of 465kW with a gain of 49dB at 91GHz when utilized a 100kV, 20A, v1/v2=1.2 electron beam from a magnetron injection gun. Based on coupled mode theory, this paper discuss TE02-TE01 mode converter within a tapered waveguide radius and obtain a bandwidth about 4.1GHz, the conversion efficiency can exceed 97%.
Keywords :
coupled mode analysis; gyrotrons; microwave amplifiers; travelling wave tubes; TE02-TE01 mode converter; W-band second-harmonic gyro-TWT amplifier; coupled mode theory; current 20 A; frequency 91 GHz; gain 49 dB; magnetron injection gun; nonlinear analysis; power 465 kW; second cyclotron harmonic; voltage 100 kV; Bandwidth; Frequency conversion; Gyrotrons; Harmonic analysis; Power amplifiers; Power generation; Gyro-TWT; Mode converter; Second-harmonic; W-band;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2011 IEEE International
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-8662-5
DOI :
10.1109/IVEC.2011.5747012
