Experimental results from an 8-beam, 5-cavity multiple-beam klystron with 6% bandwidth

D. Abe, J. Qiu, B. Levush, D. Pershing, E. Wright, K. Nguyen, F. Wood, R. Myers, E. Eisen, I. Chernyavskiy, A. Vlasov
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Abstract

We describe the results of recent experiments with an eight- beam, five-cavity multiple-beam klystron (MBK). The electron gun is of the same design as used in our previous MBK and operates at a nominal cathode voltage of -45 kV and a total current of 32 A. The electrodynamic circuit is comprised of a two-gap input cavity, a two-gap idler cavity, two additional single-gap idler cavities, and a two-gap output cavity and has a total length of 22 cm. All of the multi-gap cavities operate in the pi-mode. Some of the cavities were loaded with a lossy dielectric to reduce the Q. Output power is extracted from both of the output resonator gaps in four waveguide arms (two on each gap). The tube produces ~ 600 kW of peak output power at saturation with a corresponding electronic efficiency of 40%. Beam transmission is excellent: > 99% in the small-signal regime and > 93% at saturation. Despite a mismatch in the input circuit that reduces the gain in the upper portion of the band, the MBK has a measured 3-dB bandwidth of ~ 6%. We will describe efforts to improve the input circuit match and will compare measured data with the results of numerical modeling using the MAGIC 3D particle-in-cell code and the 2.5D large-signal code, TESLA.
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6%带宽下8束5腔多速调管的实验结果
本文描述了最近用八束五腔多束速调管(MBK)进行的实验结果。电子枪的设计与我们以前的MBK相同,在-45 kV的标称阴极电压和32 a的总电流下工作。该电动力电路由一个双间隙输入腔、一个双间隙空转腔、两个附加的单间隙空转腔和一个双间隙输出腔组成,其总长度为22 cm。所有的多间隙腔都在pi模式下工作。一些空腔被加载有损耗介质以降低q值,输出功率从四个波导臂的两个输出谐振腔间隙中提取(每个间隙两个)。该管在饱和状态下产生约600千瓦的峰值输出功率,相应的电子效率为40%。波束传输非常出色:在小信号状态下>为99%,在饱和状态下>为93%。尽管输入电路中的失配降低了频段上部的增益,但MBK的实测3db带宽为~ 6%。我们将描述改善输入电路匹配的努力,并将测量数据与使用MAGIC 3D细胞内粒子代码和2.5D大信号代码TESLA的数值模拟结果进行比较。
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