Title :
W-band TE01 gyrotron backward-wave oscillator with distributed losses
Author :
Chang, T.H. ; Yeh, Y.S. ; Yu, C.F. ; Pao, K.F. ; Hsiao, M.C. ; Shin, Y.Y. ; Cheng, J.H. ; Luo, J.Y.
Author_Institution :
Dept. of Phys., Nat. Tsing Hua Univ., Hsinchu
Abstract :
Distributed wall losses are adopted to enhance the stability and tunability of a W-band TE01 gyrotron backward-wave oscillator (gyro-BWO). Simulation results reveal that distributed wall losses can effectively suppress the competing transverse modes and high-order axial modes, but do not significantly degrade the performance of a gyro-BWO operating at the fundamental axial mode. Extensive numerical calculations are conducted. The effects of guiding center radius and waveguide tapering on the start-oscillation currents are examined. Preliminary tuning properties of the gyro-BWO are presented. The gyro-BWO is predicted to yield a peak output power of 100 kW centered at 96 GHz with an efficiency of 20 % and a 3-dB tuning bandwidth of 1.8 GHz at a beam of 100 kV and 5 A.
Keywords :
backward wave oscillators; gyrotrons; millimetre wave oscillators; millimetre wave tubes; tuning; W-band TE01 gyrotron backward-wave oscillator; bandwidth 1.8 GHz; current 5 A; distributed wall losses; efficiency 20 percent; frequency 96 GHz; guiding center radius effects; gyro-BWO; high-order axial modes suppression; power 100 kW; stability; start-oscillation currents; transverse modes suppression; tunability; voltage 100 kV; waveguide tapering effects; Bandwidth; Degradation; Gyrotrons; Magnetic fields; Oscillators; Physics; Power generation; Stability; Tellurium; Tuning; W-band; distributed loss; gyro-BWO;
Conference_Titel :
Infrared and Millimeter Waves, 2007 and the 2007 15th International Conference on Terahertz Electronics. IRMMW-THz. Joint 32nd International Conference on
Conference_Location :
Cardiff
Print_ISBN :
978-1-4244-1438-3
DOI :
10.1109/ICIMW.2007.4516640
