Demonstration of efficient beam-wave interaction for a MW-level 48 GHz gyroklystron amplifier
Demonstration of efficient beam-wave interaction for a MW-level 48 GHz gyroklystron amplifier
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DOI：
10.1063/1.5144590
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发表时间：
2020-05
影响因子：
2.2
通讯作者：
L. Nix;Liang Zhang;Wenlong He;C. Donaldson;K. Ronald;A. Cross;C. Whyte
中科院分区：
文献类型：
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作者：
L. Nix;Liang Zhang;Wenlong He;C. Donaldson;K. Ronald;A. Cross;C. Whyte
高频射频直线加速器(LINAC)的发展需要考虑一些技术挑战，如电子束线性化。本文介绍了一种适用于X波段直线加速器四次谐波线性化系统毫米波功率源的48 GHz MW级三腔回旋速调管放大器的互作用电路设计。输出腔工作在圆柱形TE0，2，1模式，而输入腔和聚束腔工作在TE0，1，1模式。采用解析计算和粒子模拟相结合的方法设计了相互作用电路。仿真结果表明，优化后的回旋速调管在140kV，37A电子束的驱动下，在48 GHz时，输出功率可达2.3 mW，增益为36分贝，效率为44%。
The development of high-frequency RF linear accelerators (linacs) requires the consideration of several technological challenges, such as electron bunch linearization. Presented in this paper is the design of the interaction circuit for a 48 GHz MW-level three-cavity gyroklystron amplifier, appropriate for application as a millimeter wave power source in a fourth harmonic linearizing system for an X-band linac. The output cavity is operated at the cylindrical TE0,2,1 mode, while the input and buncher cavities are operated at the TE0,1,1 mode. The interaction circuit has been designed using a combination of analytical calculations and particle-in-cell simulations. The optimized gyroklystron is shown, through simulation, to deliver an output power of up to 2.3 MW with a gain of 36 dB and an efficiency of 44% at 48 GHz, when driven by a 140 kV, 37 A electron beam.