The preliminary design results of a 1-MW,Kuband gyrotron traveling wave amplifier(gyro-TWA)are presented.Operating at the second cyclotron harmonic of the TE11 mode,the amplifier characterizes good stability even in t...The preliminary design results of a 1-MW,Kuband gyrotron traveling wave amplifier(gyro-TWA)are presented.Operating at the second cyclotron harmonic of the TE11 mode,the amplifier characterizes good stability even in the case of no distributed losses loaded,which could potentially allow it to be operated at high average power.Large signal simulation shows that the amplifier can generate a saturated peak power of about 1MW with efficiency of 26.6%,gain of 31 dB,and 3-dB bandwidth of about 1 GHz when driven by a 100 kV,40 A electron beam with 5%axial velocity spread.展开更多
This paper presents an unified comprehensive model for the analysis of the spectral properties of Fabry-Perot laser diodes and conventional semiconductor optical amplifiers. We develop the model by considering the wid...This paper presents an unified comprehensive model for the analysis of the spectral properties of Fabry-Perot laser diodes and conventional semiconductor optical amplifiers. We develop the model by considering the wide-band amplified spontaneous emission fields and the input optical signal fields in a general frame. Specifically, this paper discusses theoretical aspects of the model in details, which are based upon the spectra of material gain and spontaneous emission power, nonlinear gain suppression, and longitudinal spatial hole burning. This paper also presents simulation results of the model for the case of conventional semiconductor optical amplifier and the case of Fabry-Perot laser diode to demonstrate its capabilities.展开更多
Periodic dielectric-loaded waveguide is one of the diaphragmatic waveguides. For the excellent mode-selective propagation ability, it is of value for applications in gyrotron-traveling-wave amplifiers （gyro-TWT）, ac...Periodic dielectric-loaded waveguide is one of the diaphragmatic waveguides. For the excellent mode-selective propagation ability, it is of value for applications in gyrotron-traveling-wave amplifiers （gyro-TWT）, accelerators, and other microwave propagation systems. This paper focuses on studying the application of the strong lossy-dielectric- loaded periodic waveguide in millimeter-wave gyro-TWT. It is revealed that due to the lossy property of the dielectric, the energy in the dielectric slots is absorbed effectively and the high order Bloch harmonics induced by the periodicity of the structure are suppressed, which changes the discrete spectrum under losstess condition into a continuous one. As a result, the periodicity of the system is severely suppressed and a mode in the hollow region could be approximated by a fast wave mode in an empty waveguide. These results bring specific guidance for the applications of the lossy dielectric-loaded waveguide in gyro-TWTs and other devices.展开更多
基金supported by the Funds for Doctor Degree Teacher of North China Electric Power University (Grant No.200822008).
文摘The preliminary design results of a 1-MW,Kuband gyrotron traveling wave amplifier(gyro-TWA)are presented.Operating at the second cyclotron harmonic of the TE11 mode,the amplifier characterizes good stability even in the case of no distributed losses loaded,which could potentially allow it to be operated at high average power.Large signal simulation shows that the amplifier can generate a saturated peak power of about 1MW with efficiency of 26.6%,gain of 31 dB,and 3-dB bandwidth of about 1 GHz when driven by a 100 kV,40 A electron beam with 5%axial velocity spread.
文摘This paper presents an unified comprehensive model for the analysis of the spectral properties of Fabry-Perot laser diodes and conventional semiconductor optical amplifiers. We develop the model by considering the wide-band amplified spontaneous emission fields and the input optical signal fields in a general frame. Specifically, this paper discusses theoretical aspects of the model in details, which are based upon the spectra of material gain and spontaneous emission power, nonlinear gain suppression, and longitudinal spatial hole burning. This paper also presents simulation results of the model for the case of conventional semiconductor optical amplifier and the case of Fabry-Perot laser diode to demonstrate its capabilities.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 60871051,60871047 and 60971072)
文摘Periodic dielectric-loaded waveguide is one of the diaphragmatic waveguides. For the excellent mode-selective propagation ability, it is of value for applications in gyrotron-traveling-wave amplifiers （gyro-TWT）, accelerators, and other microwave propagation systems. This paper focuses on studying the application of the strong lossy-dielectric- loaded periodic waveguide in millimeter-wave gyro-TWT. It is revealed that due to the lossy property of the dielectric, the energy in the dielectric slots is absorbed effectively and the high order Bloch harmonics induced by the periodicity of the structure are suppressed, which changes the discrete spectrum under losstess condition into a continuous one. As a result, the periodicity of the system is severely suppressed and a mode in the hollow region could be approximated by a fast wave mode in an empty waveguide. These results bring specific guidance for the applications of the lossy dielectric-loaded waveguide in gyro-TWTs and other devices.
