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为了适应质子X荧光分析实验的要求,在1.2米回旋加速器工作磁场H_0=16.0kGs条件下加速H_s~+(经铅箔介离)来提供3.5MeV的质子束。为此要求D电路的共振频率从原来的8.5MHz最低值降低到8MHz。众所周知,降频的方法较多,但归根结底是要求增加D电路的电感或电容,我们对几种降频的方法进行过分析比较,认为在D电路中并联真空电容的方法,比较简便,易于实现。
In order to meet the requirement of proton X fluorescence analysis experiment, 3.5MeV proton beam was accelerated by accelerating H_s ~ + (lead-foil mediated) under the working magnetic field of H_0 = 16.0kG at 1.2m cyclotron. To this end, the resonant frequency of the D circuit is required to be reduced from the lowest value of 8.5 MHz to 8 MHz. As we all know, there are many ways to reduce the frequency, but in the final analysis, it is required to increase the inductance or capacitance of the D circuit. Several methods for reducing the frequency are analyzed and compared. It is considered that the method of parallelizing the vacuum capacitor in the D circuit is relatively simple and easy to implement .