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应用蒙特卡罗模拟技术对中国先进研究堆（CARR）高分辨中子粉末衍射谱仪（HRPD）和两条冷中子导管（CNGs）的设计方案进行了模拟研究。 对于高分辨中子粉末衍射谱仪,其设计的最高分辨要求达到△d/d=2×10-3,样品处中子注量率大于106cm-2·s-1。通过模拟研究,得到了谱仪的分辨率曲线、样品处中子注量率等主要参数的模拟计算结果。讨论了高分辨模式和高强度模式下的分辨率和强度变化。对该谱仪与中国原子能科学研究院重水研究堆（HWRR）旁中低分辨中子粉末衍射仪的分辨水平和模拟衍射谱进行了比较。通过模拟,对该谱仪所需的垂直聚焦单色器进行了优化选取。得到了
Monte Carlo simulations were used to simulate the design of HRPD and two CNGs in China Advanced Research Reactor (CARR). For the high-resolution neutron powder diffraction spectrometer, the highest resolution requirement of design is Δd / d = 2 × 10-3, and the neutron fluence rate of the sample is greater than 106cm-2 · s-1. Through the simulation study, the resolution curves of the spectrometer and the simulation results of the neutron fluence rate at the sample are obtained. Discusses the resolution and intensity changes in high-resolution and high-intensity modes. The resolution and simulated diffraction spectra of the medium and low resolution neutron powder diffractometer beside HWRR were compared with those of the spectrometer and the China Institute of Atomic Energy. Through simulation, the vertical focusing monochromator needed by this spectrometer was optimized and selected. Got