The start-oscillation-current of a gyro-TWT (gyrotron traveling-wave tube) determines the stable operating current level of the device. The amplifier is susceptible to oscillations when the operating current level is ...The start-oscillation-current of a gyro-TWT (gyrotron traveling-wave tube) determines the stable operating current level of the device. The amplifier is susceptible to oscillations when the operating current level is higher than the start-oscillation current. There are several ways of calculating the start-oscillation current, including using the linear and nonlinear theory of a gyro-TWT. In this paper, a simple way of determining the start-oscillation current of lossy gyro-TWT is introduced. The linear TWT parameters that include the effects of synchronism, loss, and gain, were converted to gyro-TWT parameters to calculate the start-oscillation-current. The dependence on magnetic field, loss, and beam alpha was investigated. Calculations were carried out for a V-band gyro-TWT for both operating and competing modes. The proposed method of calculating the start-oscillation current provides a simple and fast way to estimate the oscillation conditions and can be used for the design process of a gyro-TWT.展开更多
通过软件仿真方法分析和设计了W波段回旋行波管的输入输出耦合器、磁控注入式电子枪以及高频互作用电路,根据优化结果加工了实物并进行了热测实验.实验结果表明,电子注电压60 k V,电流6 A,在94 GHz频率获得了最大峰值功率78 k W,增益53....通过软件仿真方法分析和设计了W波段回旋行波管的输入输出耦合器、磁控注入式电子枪以及高频互作用电路,根据优化结果加工了实物并进行了热测实验.实验结果表明,电子注电压60 k V,电流6 A,在94 GHz频率获得了最大峰值功率78 k W,增益53.9 d B以及21.7%的效率,峰值功率大于50 k W带宽达到3.8 GHz.PIC粒子模拟和热测实验均表明,设计的W波段回旋行波管能够稳定的工作,从而证明周期加载高频互作用电路在抑制寄生模式以及自激振荡方面具有很大的优势.展开更多
利用场匹配理论建立传输级联矩阵的方法对高功率Ka波段双窗片结构输出窗进行分析优化计算,再通过高频电磁软件HFSS进行验证,设计出了相对带宽大于11%的双层窗片输出窗。用HFSS与有限元分析软件ANSYS协同仿真的新方法对双窗片输出结构进...利用场匹配理论建立传输级联矩阵的方法对高功率Ka波段双窗片结构输出窗进行分析优化计算,再通过高频电磁软件HFSS进行验证,设计出了相对带宽大于11%的双层窗片输出窗。用HFSS与有限元分析软件ANSYS协同仿真的新方法对双窗片输出结构进行热分析,研究了Ka波段回旋行波管工作模式分别为TE01和TE11两种不同模式时双窗片结构输出窗在不同频点的功率容量。研究表明:工作模式为TE01时输出窗片的功率容量比工作在TE11模式下大约高8 k W。展开更多
文摘The start-oscillation-current of a gyro-TWT (gyrotron traveling-wave tube) determines the stable operating current level of the device. The amplifier is susceptible to oscillations when the operating current level is higher than the start-oscillation current. There are several ways of calculating the start-oscillation current, including using the linear and nonlinear theory of a gyro-TWT. In this paper, a simple way of determining the start-oscillation current of lossy gyro-TWT is introduced. The linear TWT parameters that include the effects of synchronism, loss, and gain, were converted to gyro-TWT parameters to calculate the start-oscillation-current. The dependence on magnetic field, loss, and beam alpha was investigated. Calculations were carried out for a V-band gyro-TWT for both operating and competing modes. The proposed method of calculating the start-oscillation current provides a simple and fast way to estimate the oscillation conditions and can be used for the design process of a gyro-TWT.
文摘通过软件仿真方法分析和设计了W波段回旋行波管的输入输出耦合器、磁控注入式电子枪以及高频互作用电路,根据优化结果加工了实物并进行了热测实验.实验结果表明,电子注电压60 k V,电流6 A,在94 GHz频率获得了最大峰值功率78 k W,增益53.9 d B以及21.7%的效率,峰值功率大于50 k W带宽达到3.8 GHz.PIC粒子模拟和热测实验均表明,设计的W波段回旋行波管能够稳定的工作,从而证明周期加载高频互作用电路在抑制寄生模式以及自激振荡方面具有很大的优势.
文摘利用场匹配理论建立传输级联矩阵的方法对高功率Ka波段双窗片结构输出窗进行分析优化计算,再通过高频电磁软件HFSS进行验证,设计出了相对带宽大于11%的双层窗片输出窗。用HFSS与有限元分析软件ANSYS协同仿真的新方法对双窗片输出结构进行热分析,研究了Ka波段回旋行波管工作模式分别为TE01和TE11两种不同模式时双窗片结构输出窗在不同频点的功率容量。研究表明:工作模式为TE01时输出窗片的功率容量比工作在TE11模式下大约高8 k W。
