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将SU(2)L×SU(2)R手征对称的σ模型推广到带电磁场情况下的手征σ模型,采用研究自恰性方程的方法研究了同时具有动力学破缺和真空自发破缺的手征SU(2)L×SU(2)R×U(1)σ模型,得到了考虑动力学自发破缺、真空自发破缺和电磁相互作用后,σ、π介子和核子都出现了不同的质量修正,并得到此模型中σ,π和核子以不同方式依赖于动力学破缺的具体表示. 相似文献
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A theoretical model is developed for calculating the eigenmodes of the multi-gap resonant cavity. The structure of concern is a kind of ladder-type circuit, offering the advantages of easy fabrication, high characteristic impedance(R/Q),and thermal capacity in the millimeter wave to THz regime. The eigenfunction expansion method is used to establish the field expressions for the gaps and the coupling region. Then, the match conditions at the interface are employed, which leads to a group of complicate boundary equations in the form of an infinite series. To facilitate the mathematical treatments and perform a highly efficient calculation, these boundary equations are transformed into the algebraic forms through the matrix representations. Finally, the concise dispersion equation is obtained. The roots of the dispersion equation include both the axial modes in the gaps, which include the fundamental and the high-order modes, and the cavity modes in the coupling region. Extensive numerical results are presented and the behaviors of the multi-gap resonant cavity are examined. 相似文献
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利用3维电磁场计算软件MAFIA对L波段100 kW多注速调管的多注电子光学系统进行了模拟计算。通过编写宏程序使MAFIA可以计算旁轴电子枪的性能参数,给出了磁场分布并分析了磁场的差异对电子轨迹的影响。模拟表明:中心注磁场具有轴对称性,在均匀区,轨迹的波动性最小,电子轨迹的层流性也最好; 内层电子注径向磁场较小,轨迹的波动性略大于中心注的情况;外层电子注靠近极靴处径向磁场最大,电子轨迹的波动最大,层流性最差。计算并模拟显示了18个电子注在收集极入口处的发散情况。 相似文献
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