Development of a Dual Mode, Variable Volume Resonant Cavity System

R. Spiegel, D. E. Kerns, E. Bronaugh
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Abstract

A cavity system capable of producing independent electric and magnetic fields by the simultaneous excitation of two indepen­ dent cavity modes has been built and tested. The cavity length was made adjustable by a novel mechanical design which allowed an end plate to be accurately positioned at the desired length. The adjustable length provided the flexibility to selectively excite higher order cavity modes without building a new cavity for each mode. In addition, a mechanical design is set forth for a cavity whose cross sectional dimensions as well as length can be varied. space. This can present interference problems and radiation hazards. High strength electromagnetic fields above around 50 MHz can potentially couple very strongly to objects the size of humans;4,5 this could be hazardous to laboratory personnel. Considering the above, it is felt that a different approach to simulating complex electromagnetic fields is needed. The analysis presented in this paper indicates that a resonant cavity system is feasible. A resonant cavity system can provide (1) a very efficient conversion of source power to high intensity fields, and (2) in­ dependent electric and magnetic fields by the simultaneous excita­ tion o f two independent cavity modes. Other major advantages o f a cavity system are:
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双模变体积谐振腔系统的研制
建立并测试了一种由两种独立腔模同时激发而产生独立电场和磁场的腔系统。空腔长度通过一种新颖的机械设计可调节,该设计允许端板精确地定位在所需的长度上。可调节的长度提供了选择性地激发高阶腔模式的灵活性,而无需为每个模式建立新的腔。此外,还提出了一种横截面尺寸和长度可变化的腔体的机械设计。空间。这会产生干扰问题和辐射危害。大约50兆赫以上的高强度电磁场可能与人类大小的物体非常强烈地耦合;这可能对实验室人员有害。综上所述,我们认为需要一种不同的方法来模拟复杂的电磁场。本文的分析表明,谐振腔系统是可行的。谐振腔系统可以提供(1)非常有效地将源功率转换为高强度场,以及(2)通过同时激发两个独立的腔模式来提供相关的电场和磁场。空腔系统的其他主要优点有:
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