束流发射度对质子照相色差模糊的影响

分析了质子照相过程中发射度的增长过程。开展了照相系统设计，针对设计的照相系统，采用理论分析和蒙特卡罗计算的方法，具体分析了各个发射度增长因素的影响程度。分析结果表明:对于高能质子照相，加速器的引出发射度对系统的色差模糊的影响可以忽略，但对于中能质子照相，加速器的引出发射度不可忽略。可通过提高加速器引出系统的聚焦能力和减小散束器的厚度来减小发射度影响。

Effect of beam emittance on chromatic blur for proton radiography

The process of emittance increase in proton radiography is analyzed. A radiographic system is designed, and based on it the factors affecting emittance increase are studied with theoretical analysis and Monte Carlo simulation. The results show that the extracted emittance from the accelerator is neglectable for high energy proton radiography, and cannot be neglected for medium energy proton radiography. The extracted emittance could be reduced through decreasing the thickness of the diffuser and enhancing the focusing ability of the accelerators extraction system.