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根据离子阱利用电磁场俘获和囚禁离子的特殊要求,设计并制作了线形离子阱射频源。文章分析了特定容性负载情况下输出高电压射频信号的优化方案,采用可变电感控制方式,使频率可调。设计了一种新型的可调电感器应用于LC串联谐振电路,方便地实现了RF频率计算机自动控制。经自制双磁环电感参数测试表明,所组成的谐振电路频率跟踪效果好。此射频信号通过电容耦合馈送到阱电极,具有良好的频率稳定性和幅度稳定性,调节方便。
According to the special requirements of ion trap to trap and trap ions in the electromagnetic field, a linear ion trap RF source is designed and fabricated. The article analyzes the optimization scheme of outputting high voltage RF signal under certain capacitive load, and adopts variable inductance control mode to make the frequency adjustable. A novel adjustable inductor is designed for the LC series resonant circuit to realize the automatic control of RF frequency computer. Self-made dual-core inductance parameter test shows that the composition of the resonant frequency tracking circuit is good. The RF signal is fed to the well electrode through capacitive coupling, with good frequency stability and amplitude stability, and easy adjustment.