关键词: 低混杂波电流驱动, 微波激励源, 数字锁相技术, 功率幅度控制, 输出波形控制

Abstract: The problem that the response frequency of the klystron will be shifted after long-term operation
and the analog phase-locked loop cannot work at the optimal frequency of the system has been solved by using of
digital phase-locked loop technology to achieve high-precision and adjustable frequency output performance
within a certain bandwidth. A power amplitude control circuit is added after the shifter to ensure that the output
power of the linear amplifier will not be affected by the phase adjustment. A waveform control unit based on the
combination of digital-to-analog conversion (D/A) technology and microwave electrically adjustable technology
is designed to solve the problem that the output waveform of the exciter is uncontrollable. Through the above
three improvements, the performance optimization design of the microwave exciter of the LHCD system on
HL-2M tokamak has been completed. 

Key words: LHCD, Microwave exciter, Digital phase lock technology, Power amplitude control, Output waveform control