Validation of Monte-Carlo simulations with measurements at the ICON beam-line at SINQ
Validation of Monte-Carlo simulations with measurements at the ICON beam-line at SINQ
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DOI：
10.1016/j.nima.2007.11.061
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发表时间：
2008-02-11
影响因子：
1.4
通讯作者：
Zanini, L.
中科院分区：
文献类型：
--
作者：
Giller, L.;Filges, U.;Zanini, L.
图标是中子散布源SINQ的新的冷中子成像设施。图标设施放置在光束线S52上，直接视为冷液体D-2主持人。梁线包括一个4.4 m长的准直截面，然后是1 i m长的成像系统飞行路径。准直截面的基本部分由六个旋转鼓和一个可变的孔轮组成。根据研究的对象，使用不同的光圈。测量结果表明，每个设置具有不同的空间中子通量分布和特定的光束轮廓。测得的光束轮廓已用于验证模拟结果与蒙特卡洛计划MCNPX与中子射线追踪程序MCSTA结合的结果。在第一步中，MCNPX用于计算直接截面入口处封闭于SINQ目标的中子光谱。这些结果是模拟梁线本身的MCSTA的输入。在本文中，将比较和讨论实验和理论结果。 （c）2008 Elsevier B.V.保留所有权利。
ICON is the new cold neutron imaging facility at the neutron spallation source SINQ. The ICON facility is placed at beam-line S52 with direct view to the cold liquid D-2 moderator. The beam-line includes a 4.4 m long collimation section followed by a 1 I m long flight path to the imaging system. The essential part of the collimation section is composed of six revolving drums and a variable aperture wheel. Depending on the investigated object, different apertures are used. Measurements have shown that each setup has a different spatial neutron flux distribution and specific beam profiles. Measured beam profiles have been used to validate results of simulations coupling the Monte-Carlo program MCNPX with the neutron ray-tracing program McStas. In a first step, MCNPX was used to calculate neutron spectra closed to the SINQ target, at the entrance of the collimation section. These results served as an input for Mcstas where the beam-line itself was simulated. In the present paper, experimental and theoretical results will be compared and discussed. (c) 2008 Elsevier B.V. All rights reserved.