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以行波管放大器中辐射场的非线性不稳定阈值分析为基础 ,对辐射场从频率分叉到混沌的演化过程和不同区域这些非线性不稳定态的时间特性和频率特性进行了研究 .在“软”非线性区域 ,辐射场表现为极限环振荡和频率分岔 ,频谱是离散的且相对于载波频率是不对称的 .这种不稳定是阵发性的 ,适当的调节控制参量 ,可使器件工作在所需的定态或极限环振荡态上 ;在“硬”非线性区域 ,辐射场表现为非周期的随机振荡和频率混沌 ,频谱连续且频带很宽 ,场幅值较大的成分集中在接近于零频的低频范围里 .这种不稳定是连续性的 ,不能通过调节参量来消除
Based on the nonlinear instability threshold analysis of the radiation field in a traveling wave tube amplifier, the evolution of the radiation field from frequency bifurcation to chaos and the time and frequency characteristics of these nonlinear instabilities in different regions are studied. In the “soft” nonlinear region, the radiation field appears as the limiting ring oscillation and the frequency bifurcation, the spectrum is discrete and asymmetric with respect to the carrier frequency, and this instability is paroxysmal and the appropriate control parameters can be adjusted So that the device works in the required steady-state or limit-ring oscillation state. In the “hard” nonlinear region, the radiation field appears as aperiodic random oscillation and frequency chaos, the spectrum is continuous and the band is wide, the field amplitude is large The components are concentrated in the low-frequency range close to zero. This instability is continuous and can not be eliminated by adjusting the parameters