DocumentCode :
2734849
Title :
Rise and Fall Time Behavior of the Gyrotron Backward-Wave Oscillator
Author :
Pao, K.F. ; Chang, T.H. ; Fan, C.T. ; Yu, C.F. ; Chen, S.H. ; Chu, K.R.
Author_Institution :
Nat. Center for Theor. Sci., Hsinchu
fYear :
2006
fDate :
18-22 Sept. 2006
Firstpage :
25
Lastpage :
25
Abstract :
Axial modes of the gyro-BWO are characterized by a discrete set of optimum transit angles separated by ~2pi. We show in theory that, during the rise and fall portions of the beam pulse, the frequency of a given axial mode varies in such a way that its transit angle remains at the characteristic value of the mode. Furthermore, in this transient period, axial mode competition is governed by the distinctive asymmetry of the mode profiles rather than by levels of the start-oscillation currents. A Ka-band gyro-BWO experiment has been carried out to examine the rise/fall time behavior. Time-frequency analyses of the output pulses show good agreement with theoretical predictions.
Keywords :
backward wave oscillators; gyrotrons; Ka-band; axial mode competition; beam pulse; fall time behavior; gyrotron backward-wave oscillator; optimum transit angles; rise time behavior; Electron beams; Feedback loop; Gyrotrons; Jitter; Optical reflection; Oscillators; Physics education; Resonance; Time frequency analysis; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006. IRMMW-THz 2006. Joint 31st International Conference on
Conference_Location :
Shanghai
Print_ISBN :
1-4244-0400-2
Electronic_ISBN :
1-4244-0400-2
Type :
conf
DOI :
10.1109/ICIMW.2006.368234
Filename :
4221968
Link To Document :
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