在迴旋管谐振迴路中利用缓变椭圆截面过渡段来抑制杂模的探讨
INVESTIGATION ON THE POSSIBILITY TO MAKE USE OF SLOWLY VARYIMG ELLIPTICAL TRANSITION REGION IN CAVITY OF GYROTRON TO SUPPRESS HIGH ORDER UNWANTED MODES
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摘要: 在迴旋管中圆截面谐振腔与圆环电子束相互作用是最合理的。但在这种腔中有与主模谐振频率极接近的杂模存在,本文探讨在相互作用区仍用圆截面谐振腔,而在互作用区外加进一段特殊设计的缓变椭圆过渡段用来抑制杂模的可能性。我们这样设计,其杂模场强能够延伸进过渡段而主模场强则不行;再在过渡段中加载,使其起到抑制杂模而保存主模(cTE0n和sTE1n)的作用。
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关键词:
- 迴旋管; 杂模抑制; 缓变椭圆截面过渡段
Abstract: It is proposed to introduce a specially designed cavity: in the interaction region, the circular cross-section is kept, beyond which a slowly varying elliptical auxiliary transition section is used to suppress the unwanted modes. The cavity is so designed: the fields of unwanted modes can penetrate to the auxiliary section, but that of the operating mode can not. If we then load the auxiliary section, the unwanted modes can be attanuated but the operating mode (cTE0n and sTE1n) maintained. -
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