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功率耦合器是中国散裂中子源(CSNS)漂移管直线段(DTL)的关键部件之一,其耦合系数通常通过调节耦合孔尺寸得到,为了确保耦合系数达到设计值,制造了一个冷模进行耦合度的调节。在冷模测量过程中,发现了仅通过改变耦合孔尺寸耦合系数达不到目标值的问题,因此提出了一种与测量结果对比有良好仿真精度的新模型用于分析,并使用该仿真模型分析了PEFP使用的理论及影响耦合度的主要参数。最终耦合度被调节至目标值,正式件的冷测结果也表明其与仿真结果基本相同。
The power coupler is one of the key components of the DTLS of the Chinese spallation neutron source (CSNS) drift tube. The coupling coefficient is usually obtained by adjusting the size of the coupling hole. To ensure that the coupling coefficient reaches the designed value, a cold mold Adjust the degree of coupling. In the process of cold mode measurement, it was found that the coupling coefficient of the coupling hole can not reach the target value only by changing the coupling coefficient. Therefore, a new model with good simulation accuracy in comparison with the measurement results was proposed for analysis and used the simulation model The theory of PEFP and the main parameters that influence the coupling degree are analyzed. The final coupling is adjusted to the target value, and the cold test result of the official part also shows that it is basically the same as the simulation result.