Abstract Advances in solid state device technologies have seen its use foray into areas such as microwave heating and powering the RF cavities of an accelerator. This paper explores the possibility of use of a solid state source/driver for current drive systems of tokamaks. The design of a modular solid state source to be used as a driver for klystrons in the LHCD system of SST-1 tokamak is presented. It comprises of solid state power amplifier (SSPA) units, driven by voltage controlled oscillator (VCO) and pre-driver (gain) amplifier. The paper discusses about the design methodology and simulation of these individual components. The component and system level computer simulation based on behavioural and file based model was performed using AWR Microwave Office (MWO) software. The linear and non-linear EM analysis of individual components have been carried out to ascertain its performance. The designed VCO delivers an output power of 20.2 dBm and phase noise of -91.64 dB/Hz (100 KHz offset) at 3.7 GHz. The pre-driver stage (gain amplifier) provides a large signal gain of 15.7 dB and return loss of -14 dB at 3.7 GHz. The individual power amplifier draws a continuous wave (CW) output power of 45.2 dBm for an input power of 35 dBm and efficiency of 56.68%. The system simulation results exhibit around 1 kW of output power in ideal conditions.

中文翻译：

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用于 SST-1 托卡马克 LHCD 系统的 3.7 GHz、1 kW CW 固态驱动器的设计

摘要 随着固态器件技术的进步，它已涉足微波加热和为加速器的射频腔供电等领域。本文探讨了将固态源/驱动器用于当前托卡马克驱动系统的可能性。介绍了在 SST-1 托卡马克 LHCD 系统中用作速调管驱动器的模块化固态源的设计。它由固态功率放大器 (SSPA) 单元组成，由压控振荡器 (VCO) 和前置驱动器（增益）放大器驱动。本文讨论了这些单个组件的设计方法和仿真。基于行为和基于文件的模型的组件和系统级计算机模拟是使用 AWR Microwave Office (MWO) 软件执行的。已对单个组件进行了线性和非线性 EM 分析，以确定其性能。设计的 VCO 在 3.7 GHz 下提供 20.2 dBm 的输出功率和 -91.64 dB/Hz（100 KHz 偏移）的相位噪声。前置驱动器级（增益放大器）在 3.7 GHz 下提供 15.7 dB 的大信号增益和 -14 dB 的回波损耗。对于 35 dBm 的输入功率和 56.68% 的效率，单个功率放大器的连续波 (CW) 输出功率为 45.2 dBm。系统仿真结果在理想条件下显示出大约 1 kW 的输出功率。对于 35 dBm 的输入功率和 56.68% 的效率，单个功率放大器的连续波 (CW) 输出功率为 45.2 dBm。系统仿真结果在理想条件下显示出大约 1 kW 的输出功率。对于 35 dBm 的输入功率和 56.68% 的效率，单个功率放大器的连续波 (CW) 输出功率为 45.2 dBm。系统仿真结果在理想条件下显示出大约 1 kW 的输出功率。