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微波接收技术的一个主要进展是行波脉塞的发展。尽管它有极好的低噪声特性,然而在实际使用上,由于脉塞的工作需要特殊的磁性元件和冷环境,因此存在着可怕的障碍。其所需的磁场(2～3KG)必须有千分之一的均匀度且方向垂直于脉塞晶体的长度。脉塞晶体(典型的是6英吋长)必须维持在接近绝对零度的温度。这样一个典型的实验室行波脉塞装置包括一个笨重的电磁体,以提供在适应双杜瓦液氦容器的大间隙上强的均匀磁场。
One of the major advances in microwave reception technology is the development of traveling wave plugging. Despite its excellent low-noise characteristics, in actual use there is a daunting hurdle as plug-in work requires special magnetic components and cold environments. The required magnetic field (2 ~ 3KG) must have a one-thousandth degree of uniformity and the direction perpendicular to the length of the impulse crystal. The impulse crystal (typically 6 inches long) must be maintained at near absolute zero temperature. Such a typical laboratory pulse wave plug device includes a bulky electromagnet to provide a strong uniform magnetic field over a large gap adapted to a dual Dewar liquid helium container.