质子照相磁透镜的优化设计
Optimization research on image lens of proton radiography
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摘要: 对质子照相系统中Zumbro磁透镜的参数进行了优化，使成像系统造成的图像模糊最小化，结果表明:构成Zumbro磁透镜的四极透镜对内外漂移段长度相等时，成像系统获得最小的图像模糊。对成像系统的视场进行了分析，表明视场对Zumbro透镜的参数不敏感。给出了质子能量为20 GeV时Zumbro透镜的参数，Geant4蒙特卡罗计算表明:所给的Zumbro透镜参数能正确成像。Abstract: Parameters of Zumbro lens are optimized to minimize the image blur. When the length of outer drift equals to the length of inner drift, the image blur is minimized or is very close to the minimum. Field of view of Zumbro lens is also investigated, which is not sensitive to parameters of Zumbro lens and is close to two thirds of the aperture of quadrupole magnet. Parameters of a Zumbro lens for 20 GeV proton radiography are presented. Geant4 simulation resluts show that the parameters are valid.
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Key words:
- proton radiography /
- image lens /
- image blur /
- optimization
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