Measurements of Ohmic Losses of Metallic Reflectors at 140 GHz Using a 3-Mirror Resonator Technique
Measurements of Ohmic Losses of Metallic Reflectors at 140 GHz Using a 3-Mirror Resonator Technique
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使用 3 镜谐振器技术测量 140 GHz 金属反射器的欧姆损耗
DOI：
10.1023/a:1015064616703
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
R. Wacker
中科院分区：
文献类型：
--
作者：
W. Kasparek;A. Fernández;F. Hollmann;R. Wacker
金属反射镜在毫米波区域的反射率不仅取决于材料，还取决于表面的结构和粗糙度。我们在 140 GHz 下测量了各种平面和凹槽金属和石墨样品的反射率。该技术基于 2 镜参考谐振器的品质因数与具有相同尺寸并包括待测试镜的 3 镜谐振器的品质因数的比较。在简要介绍理论后，描述了设置，并介绍和讨论了热核聚变实验中应用的各种铝镜和铜镜以及真空兼容材料的反射损耗。
The reflectivity of metallic mirrors in the millimeter wave region does not only depend on the material, but also on the structure and roughness of the surface. We have performed measurements of the reflectivity of various plane and grooved metallic and graphite samples at 140 GHz. The technique is based on the comparison of the quality factor of a 2-mirror reference resonator with the quality factor of a 3-mirror resonator which has identical dimensions and includes the mirror to be tested. After a brief presentation of the theory, the set-up is described and the reflection loss for various aluminium and copper mirrors as well as vacuum compatible materials for applications in thermonuclear fusion experiments are presented and discussed.