Design of a W-band extended interaction klystron
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摘要: 简要介绍了一种W波段分布作用速调管的设计思路、设计方案和模拟结果，并给出了该管的测试结果。该管采用大压缩比圆柱电子枪和永磁聚焦系统，阴极电压17 kV，阴极电流0.78 A；高频系统由5间隙和11间隙（输出腔）的分布作用腔组成，采用长短槽梯形结构。样管实现了脉冲输出功率大于2 kW、带宽500 MHz、增益40 dB、工作比5%等指标。Abstract: This paper briefly introduces the design of a W-band extended interaction klystron (EIK), and gives the test results. The high frequency extended interaction circuit consisted of five 5-gap buncher cavities and one 11-gap output cavity which can obtain wider bandwidth. This ladder-type multi-gap cavity circuit is easy to fabricate and supports greater energy margins. The π-mode is selected as the operating mode of the 5-gap (or 11-gap) cavities. By now, with an electron beam of 17 kV and 0.78 A, the EIK has achieved a peak output power of 2 kW, bandwidth of 500 MHz, gain of 40 dB, and duty cycle of 5%.
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表 1 主要性能指标
Table 1. Major requirements and performance of the extended interaction klystron (EIK)
frequency
bandband width/
MHzpeak power/
kWduty
cycle/%voltage/
kVefficiency/% gain/dB focus mode cooling mode weight/kg W-band 500 ≥2 ≥5 ≤20 ≥15 ≥40 permanent magnetic
focusingwater-cooling ≤6 
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表 2 多间隙腔主要特性参数
Table 2. Major parameters of the resonance cavity
cavity f /GHz （R/Q）/Ω M lower frequency interval/GHz upper frequency interval/GHz 5-gap 95.62 152 0.646 12.8 7.35 11-gap 95.47 184 0.414 9.18 2.93
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表 3 各腔频率
Table 3. Frequency of each cavity
fcav1 fcav2 fcav3 fcav4 fcav5 fcav6 f0−0.1 GHz f0−0.35 GHz f0+0.3 GHz f0+0.6 GHz f0+0.8 GHz f0
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