AI 中文总结
该研究提出一种用于质子照相的紧凑等轨迹光学方案，采用特定参数的脉冲电四极透镜系统，通过时变场实现质子能量变化主要影响到达时间而非横向图像位置，并进行了相关数值闭合测试与分析。
AI 中文摘要
我们提出一种紧凑的等轨迹光学方案用于质子照相。计算以30-60 MeV质子区间作为参考示例，该区间是TNSA机制下高能短脉冲激光加速的典型参数。该方案利用同步的时变场，使得对于选定的能量-到达时间分支，质子能量变化主要影响到达时间而非横向图像位置。参考透镜系统由四个脉冲电四极透镜组成，水平符号模式为+ - + -，在2.57 m的探测器平面处的放大率Mx = My = -3.0，公共傅里叶平面位于zF = 0.962 m，且外透镜和内透镜长度相等。理想闭合残差由二阶中心矩计算，四阶中心矩单独保留作为非高斯尾部的诊断依据。所给出的残差宽度是理想映射的数值闭合测试，而非实验分辨率预测。实际电极场、波形误差、散射、探测器模糊和空间电荷构成了该问题的下一个研究层面。
英文摘要
We consider a compact isotrajectory-optics scheme for proton radiography. The calculation uses a 30-60 MeV proton interval as a reference example, typical of high-energy short-pulse laser acceleration in the TNSA regime. The idea is to use synchronized time-dependent fields such that, for one selected energy-arrival-time branch, the proton energy changes mainly the arrival time and not the transverse image position. The reference lattice consists of four pulsed electric quadrupoles with horizontal sign pattern + - + -, magnification Mx = My = -3.0 at a detector plane of 2.57 m, a common Fourier plane at zF = 0.962 m, and equal outer and equal inner lens lengths. The ideal closure residual is calculated from second central moments. Fourth central moments are kept separately as a diagnostic of non-Gaussian tails. The quoted residual widths are numerical closure tests of the ideal map, not experimental resolution predictions. Real electrode fields, waveform errors, scattering, detector blur, and space charge define the next level of the problem.
Comments4 pages, 2 figures
