Development of code QMCPrad for fast high-energy proton radiography
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摘要: 为了快速模拟高能质子照相过程，利用蒙特卡罗（MC）技术和技巧编写了程序QMCPrad，并开展了QMCPrad与MCNPX的对比计算以及实验E955的模拟验证工作。在模型选取中，修改核反应过程权重的隐式俘获模式和一次抽样模拟穿透客体的多次库仑散射的浓缩历史方式都节约了大量的计算时间。与MCNPX相比，QMCPrad具备模拟质子在磁透镜中输运过程的能力。QMCPrad与MCNPX、实验E955的对比及验证结果表明，QMCPrad能够准确定量地模拟高能质子照相，为质子照相实验设计提供工具。Abstract: In order to simulate high-energy proton radiography quickly, the code Quick Monte Carlo Proton Radiography(QMCPrad) is developed by using MC technique and MC skills. The code is proven correct by comparing the simulation results to MCNPXs and simulating the experiment E955. In the QMCPrad, the nuclear interaction is modeled with the explicit capture model, and the multiple Coulomb scatter is treated with the condensed history method as one scatter during the proton passing through the object. These two methods reduce amounts of time for simulation. The code QMCPrad has the capability to simulate the proton transport in quadrupole. The comparison between the QMCPrad and MCNPX and the simulation result of E955 show that the QMCPrad can simulate the high-energy proton radiography quantificationally, andis a useful tool for the design of proton radiography.
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Key words:
- high-energy proton radiography /
- QMCPrad /
- elastic scatter /
- secondary particle
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