摘要
功率反馈电子直线加速器功率源的频率稳定性与磁控管功率谱的慢漂移、谱的稳定性和谱的形状有关。前两个因素影响管子振荡频率的短期稳定性,后一个因素影响其长期频率稳定性。频率稳定系统的控制精度可以用以鉴频器的检波器输出信号面积变化表示频率漂移并驱动步进电机伺服的方法来提高。以加速管入口处叠加包络的面积最大值为性能指标,以磁控管振荡频率跟踪该指标所对应的频率,可以改善振荡频率的长期稳定性。为了消除调制器对CPU工作的干扰,可用周期性地强迫CPU复位的办法来保证CPU的控制功能,本系统的频率稳定度为7×10^(-6)。
The frequency stability of the power source for a feedback LINAC depends on the slow shift, stability and form of power spectrum of the magnetron. The first two factors affect the short-term frequency stability and the last one relates to the long-term frequency stability. The control exactness of the frequency stabilization system can be increased by means of a method in which the area change of output signal from the detector of the frequency discriminator is used to indicate frequency shift and to drive a stepping servo motor. The frequency corresponding to a performance index, i.e. the maximal area of the superposition envelop at the entrance of the accelerating tube, is tracked by the oscillation frequency of the magnetron for improving the long-term frequency stability. In order to eliminate the influence of the modulator when the CPU is running, the CPU can be forced to reset periodically to keep the control function.The frequency stability is 7×10-6.
出处
《核技术》
CAS
CSCD
北大核心
1992年第3期187-192,共6页
Nuclear Techniques
关键词
频率
直线加速器
电子
功率反馈
Frequency stability Discriminator Stepping motor servoSuperposition envelop
