Properties of quarter-wavelength coaxial cavity for triode-type thermionic RF gun
Properties of quarter-wavelength coaxial cavity for triode-type thermionic RF gun
复制标题
三极管型热离子射频枪四分之一波长同轴腔特性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
H. Ohgaki
中科院分区：
文献类型：
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作者：
K. Torgasin;K. Mishima;H. Zen;K. Yoshida;H. Negm;Muhamed Omer;T. Kii;K. Nagasaki;K. Masuda;H. Ohgaki
制造并测试了具有纵向射频电源的四分之一波长同轴腔。该腔被设计为中红外自由电子激光装置的热电子三极管型射频枪的预聚束器。三极管结构的形成是为了确保减少热电子射频枪中通常出现的反向轰击效应。使用钨分配器阴极测试同轴腔。从冷试验的结果来看，可以获得约25kV的空腔电压，这符合设计特性。相反，热测试显示电压突然下降，导致运行不稳定。空腔的小尺寸导致了一些低场效应，从而导致了多重化。在本文中，我们报告了预聚束腔的测试特性。
A quarter-wavelength coaxial cavity with a longitudinal radio-frequency power supply was fabricated and tested. The cavity was designed as a pre-buncher for a thermionic triode-type radio-frequency gun of a mid-infrared free electron laser facility. The triode structure was formed to ensure the reduction of the back-bombarding effect, which usually appears in thermionic radio-frequency guns. The coaxial cavity was tested using a tungsten dispenser cathode. From the results of the cold test, a cavity voltage of about 25 kV can be attained, which corresponds to designed characteristics. In contrast, the hot test showed a sudden drop in voltage, resulting in an unstable operation. The small dimensions of the cavity caused some low-field effects, which led to multipactoring. In this paper, we report the tested characteristics of the pre-bunching cavity.