研究目的
To develop a novel Eulerian nonlinear beam-wave interaction theory considering harmonic interaction in helix traveling-wave tubes and derive analytic solutions for fundamental and harmonic frequencies.
研究成果
The Eulerian nonlinear analytic solutions and theory agree well with Lagrangian simulations at the 1-dB gain compression point, can describe saturation effects, and are simpler and more accurate than existing approaches, enabling better analytical progress in studying nonlinear phenomena in TWTs.
研究不足
The analysis assumes only fundamental and second harmonic interactions, neglecting higher harmonics. The model is based on simplifications such as treating the electron beam as a charge fluid and one-dimensional motion, which may not capture all real-world complexities. Accuracy decreases near saturation regions.
1：Experimental Design and Method Selection:
The study uses theoretical modeling and simulation based on Eulerian and Lagrangian theories. The method of successive approximation is employed to derive analytic solutions.
2：Sample Selection and Data Sources:
Simulations are conducted on C-band and Ku-band helix TWTs with parameters from existing literature.
3：List of Experimental Equipment and Materials:
No specific physical equipment is used; the work is computational, relying on theoretical models and simulation codes like BWIS code.
4：Experimental Procedures and Operational Workflow:
The process involves deriving equations, solving them analytically, and comparing results with numerical simulations from BWIS code for validation.
5：Data Analysis Methods:
Data analysis includes comparing gains, phases, and harmonic suppression ratios using percentage errors and graphical plots.
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