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  Stability analysis of TE01 gyrotron travelling wave amplifiers
Titel: Stability analysis of TE01 gyrotron travelling wave amplifiers
Auteur: Yeh, Y. S.
Wu, T. S.
Lo, Y. T.
Su, C. W.
Wu, S. C.
Verschenen in: International journal of electronics
Paginering: Jaargang 90 (2003) nr. 8 pagina's 517-532
Jaar: 2003-08
Inhoud: The fundamental harmonic TE01 gyrotron travelling wave amplifier (gyro-TWT) is a high-power, broadband, millimetre-wave amplifier with a low ohmic dissipation and a large guiding centre radius. However, spurious oscillations may reduce the amplification of the gyro-TWT. The stability of severed and distributed-loss gyro-TWTs is analysed, using a self-consistent simulation code. A nonlinear analysis of typical oscillations, including absolute instability, gyrotron backward oscillation (gyro-BWO) and reflective oscillation, is presented. Simulation results indicate that attenuating severs in the severed gyro-TWT do not suppress spurious oscillations, and that increasing the wall losses to suppress gyro-BWO in the distributed-loss gyro-TWT degrades the efficiency of the gyro-TWT amplifier. A multi-stage distributed-loss gyro-TWT design is developed to stabilize the amplification. The lossy and severed sections of the multi-stage gyro-TWT seem to increase effectively the start-oscillation currents of absolute instability and gyro-BWO, respectively. The multi-stage gyro-TWT is predicted to yield a peak output power of 155 kW at 32.9 GHz with an efficiency of 15%, a saturated gain of 45 dB and a bandwidth of 2.2 GHz for a 100 kV, 10 A electron beam with an axial velocity spread Δvz/vz = 5%.
Uitgever: Taylor & Francis
Bronbestand: Elektronische Wetenschappelijke Tijdschriften

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