5.5 MV静电加速器终端电压稳定系统
Terminal voltage control system for 5.5 MV electrostatic accelerator
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摘要: 采用对静电加速器终端电压的稳定性进行控制，以提高单离子束流品质。设计了陷波器、低通放大器、带通放大器、误差放大器等信号处理电路。陷波器为双T形结构，其中心频率为50 Hz，此频率用以滤除工频干扰。带通放大器的中心频率为35 Hz，带宽为60 Hz。误差放大器输出0～10 V的控制信号，控制电晕针放电电流。测试了单离子束能谱和束斑。结果表明：静电加速器终端电压稳定性得到明显改善，其不稳定性小于1%，提高了单离子束束流品质。Abstract: A terminal voltage control system with a generating voltmeter for electrostatic accelerator was developed. The circuit of the system was designed and made, which mainly consists of a notch filter, a band filter, an error amplifier and a corona control circuit. The notch filter was designed in the type of TT with the notch frequency about 50 Hz.The center frequency of the band filter was 35 Hz with a bandwidth of 60 Hz. The output of the circuit was 0~10 V which was used to control the corona discharge current. The energy spectrum and the radius of the single ion microbeam were measured. The results indicated that the instability of the terminal voltage was obviously eliminated to less 1%, and the spot radius of the single ion microbeam was smaller than previous.
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