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首页> 外文期刊>Proceedings of the IEE - Part C: Monographs >Mode separation at the ????????-mode in a dielectric loaded waveguide cavity
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Mode separation at the ????????-mode in a dielectric loaded waveguide cavity

机译：介质加载的波导腔中????????模式下的模式分离

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摘要

The dispersion characteristics of periodically loaded waveguides are examined. As is well known, a loaded waveguide has the properties of a filter having infinitely many stop bands, which occur when the phase change per section for the wave is a multiple of ????????. For linear accelerator and other applications it is sometimes desirable to operate the structure in the ????????-mode but the resulting zero group velocity raises considerable difficulties. In the first part of the paper it is shown how a finite group velocity at the ????????-mode frequency can be obtained in a waveguide loaded with solid dielectric discs. This is accomplished by making the discs reflectionless at the required frequency; the stop band being thus eliminated, the structure can be regarded as a confluent band-pass filter. To permit the passage of an electron beam it is necessary for the discs to have central holes. Evanescent and other propagating modes are set up, but it is shown in the latter part of the paper that it is still possible to operate the structure in the ????????-mode with a finite group velocity. This result cannot be obtained if the guide is loaded by thin metal discs, as used in most present-day linear accelerators.
机译：检查了周期性加载的波导的色散特性。众所周知，加载的波导具有滤波器的特性，该滤波器具有无限多个阻带，当波的每部分的相位变化是ΔεΔθ的倍数时会出现。对于线性加速器和其他应用，有时希望以α-β-模式运行该结构，但是所产生的零组速度增加了相当大的困难。在本文的第一部分中，示出了如何在装有固体介电盘的波导中以Δε-π-模式频率获得有限的群速度。这是通过使光盘在所需频率下无反射来实现的。如果这样消除阻带，则该结构可以看作是汇合的带通滤波器。为了允许电子束通过，盘必须具有中心孔。设置了渐逝模式和其他传播模式，但在本文的后半部分表明，仍然可以以有限的群速度在????????模式下操作结构。如果使用当今大多数线性加速器中的薄金属圆盘加载导轨，则无法获得此结果。

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