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中国原子能科学研究院将在中国先进研究堆(CARR)导管大厅的导管CNGC末端建立1台冷中子照相设备。冷中子照相设备是大型昂贵的设备,辐射防护要求高、建设周期长,一旦建成很难改变,建设方案的优化设计十分的重要。由于光路部件的复杂性,通常难以通过解析的方法得到优化设计,而蒙特卡罗模拟方法被广泛应用于复杂的中子设备的设计和建造中,并取得很好的效果。本工作利用德国哈迈所(HMI)开发的蒙特卡罗模拟软件VITESS作为模拟研究工具,结合CARR堆实际状态,参照国内外不同设计方案,对CARR堆即将建立的冷中子照相设备光路部分的堆内导管、堆外导管、光阑形状、光阑尺寸、样品位置进行了设计和模拟优化,并给出了优化设计时样品位置中子束流品质的模拟值。本工作为冷中子照相设备光路设计方案的选择提供了重要依据。
China Institute of Atomic Energy will establish a cold neutron photographic equipment at the CNGC end of the catheter of the China Advanced Research Reactor (CARR) catheterization hall. Cold Neutron photographic equipment is a large and expensive equipment, high radiation protection requirements, long construction period, once completed is difficult to change, the optimal design of the construction program is very important. Due to the complexity of the optical components, it is usually difficult to obtain the optimal design through the analytical method. The Monte Carlo simulation method is widely used in the design and construction of complex neutron devices and achieves good results. In this work, Monte Carlo simulation software VITESS developed by Hammam Germany (HMI) is used as a simulation research tool. According to the actual state of CARR reactor and reference to different design schemes at home and abroad, Heap pipe, diaphragm shape, diaphragm size and sample position were designed and simulated. The simulation results of neutron beam quality at the time of optimal design were also given. This work provides an important basis for the selection of light path design scheme of cold neutron photographic equipment.