Kirkpatrick–Baez microfocusing optics for thermal neutrons
Kirkpatrick–Baez microfocusing optics for thermal neutrons
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DOI：
10.1016/j.nima.2004.10.005
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发表时间：
2005-02
影响因子：
1.4
通讯作者：
G. Ice;C. Hubbard;B. Larson;J. Pang;J. Budai;S. Spooner;S. Vogel
中科院分区：
文献类型：
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作者：
G. Ice;C. Hubbard;B. Larson;J. Pang;J. Budai;S. Spooner;S. Vogel
Kirkpatrick-Baez中子超反射镜可以有效地将中子束聚焦到小区域内，其最大发散角受到反射镜临界角的限制。焦斑的大小主要由光源的几何缩小率和反射镜形状的图形误差决定。光线追迹计算表明，高性能的柯克帕特里克-贝兹超反射镜在聚焦到几十微米时可以保持中子源的亮度，并且可以将比不聚焦时大大约两个数量级的功率聚焦到100μm。预测的性能接近由源亮度设定的理论极限。本文描述了一个用于产生100μm以下焦斑的M3超反射镜系统的相空间参数、光线追迹计算和实际性能。虽然目前的设计是优化的中子多色微衍射，设计原则是广泛适用于一系列的中子科学。
Kirkpatrick–Baez neutron supermirrors can efficiently focus neutron beams into small areas with a maximum divergence that is limited by the mirror critical angle. The size of the focal spot is primarily determined by geometrical demagnification of the source and by figure errors in the mirror shape. Ray-tracing calculations show that high-performance Kirkpatrick–Baez supermirrors can preserve neutron-source brilliance when focusing down to tens of microns and can focus approximately two orders of magnitude greater power into 100μm than is practical without focusing. The predicted performance is near the theoretical limit set by the source brilliance. We describe the phase space arguments, ray-tracing calculations and actual performance of an M3 supermirror system designed to produce a focal spot below 100μm. Although the current design is optimized for neutron polychromatic microdiffraction, the design principles are widely applicable to a range of neutron science.