Nonlinear simulation of multimode startup in the high-order-mode coaxial-cavity gyrotron oscillator
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摘要: 给出了工作在高阶模式下的同轴腔回旋管振荡器，在考虑竞争模式情况下的多模起振过程的数理模型和具体的数值计算方法。以此为基础编制的程序对一只工作于高阶模式TE42, 22，频率为0.22 THz的同轴腔回旋管振荡器进行了多模非线性模拟研究。结果表明：在合适的腔体结构参数并考虑腔壁上的欧姆损耗情况下，竞争模式得到有效抑制，可以稳定地工作在单一模式，输出功率达0.87 MW，效率为22.8%，腔壁上的欧姆损耗低于其所能承受的最大值。Abstract: A model of multimode startup in the coaxial-cavity gyrotron operating at higher-order mode with mode competition taken into account is presented in this paper, the detailed numerical calculation method is also given. By the use of the code based on this model, the nonlinear multimode simulations on a coaxial-cavity gyrotron with the high-order mode TE42, 22 at a frequency of 0.22 THz are performed. The results show that with proper cavity parameters and considering the ohmic losses on the wall, the competing modes can be effectively suppressed, this resonator can operate stably at a single mode with the output power of 0.87 MW and corresponding efficiency of 22.8%, and the maximum density of ohmic losses on the wall is below the constraint.
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Key words:
- terahertz /
- coaxial-cavity gyrotron /
- high-order mode /
- mode competition /
- startup
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