The development of a four vane 3-MeV radio frequency quadrupole is under progress at Raja Ramanna Centre for Advanced Technology, as part of the Indian facility for spallation source. This quadrupole will be powered by four identical 150-kW solid-state amplifiers, each operating at 325 MHz. This article describes the design details, rigorous testing, and measured results of the first such constructed amplifier and its constituent components. Its output power is 150 kW, with variable pulsewidth from 1 to 5 ms, at 50 Hz of pulse repletion rate. Its pulse amplitude droop measured at 1 ms is 0.46 dB. The phase variation around an average value, measured within a single pulse at 1 ms, is less than 2.7°. Its pulse-to-pulse amplitude stability and phase stability are ±0.1 dB and ±2°, respectively. Its main features are its modular and scalable design architecture, comprising of multiple extended continuous class F 1.5-kW amplifiers, energy-efficient two-tier radial power dividers as well as combiners, compact dual-channel power sensors, and aperture-coupled directional couplers.

中文翻译：

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用于射频四极杆应用的 150 kW 脉冲固态放大器

作为印度散裂源设施的一部分，Raja Ramanna 先进技术中心正在开发四叶片 3-MeV 射频四极杆。该四极杆将由四个相同的 150 kW 固态放大器供电，每个都以 325 MHz 的频率运行。本文描述了第一个这样构建的放大器及其组成组件的设计细节、严格的测试和测量结果。其输出功率为 150 kW，脉冲宽度为 1 到 5 ms，脉冲重复率为 50 Hz。其在 1 ms 时测得的脉冲幅度下降为 0.46 dB。在 1 ms 的单个脉冲内测量的平均值周围的相位变化小于 2.7°。其脉冲到脉冲幅度稳定性和相位稳定性分别为 ±0.1 dB 和 ±2°。