Characterization of a focusing parabolic guide using neutron radiography method
Characterization of a focusing parabolic guide using neutron radiography method
复制标题
使用中子射线照相方法表征聚焦抛物面波导
DOI：
10.1016/j.nima.2005.01.108
复制
发表时间：
2005
影响因子：
1.4
通讯作者：
W. Treimer
中科院分区：
文献类型：
--
作者：
N. Kardjilov;P. Böni;A. Hilger;M. Strobl;W. Treimer
研究的目的是测试一种新型抛物形壁聚焦中子导管（喇叭形）的聚焦性能。波导长度为431mm，入口面积为16× 16mm2，出口面积为4×4mm2。内表面涂有m=3的超级镜面，由于其抛物线形状，预计入射平行光束可以聚焦在抛物线的焦点上。为了证明这一点，我们用标准的高分辨率射线照相探测器记录了导向器后面不同距离处的中子强度分布。实验在HMI的V12b仪器上进行，具有不同水平的光束单色化，证明最大强度增益约为25。本文将介绍在冷中子照相中使用聚焦导向器的考虑。
The aim of the investigation was to test the focusing properties of a new type of focusing neutron guide (trumpet) with parabolically shaped walls. The guide has a length of 431mm with an entrance area of 16×16mm2and an output area of 4×4mm2. The interior surfaces were coated with a supermirror-surface m=3 and due to their parabolic shape it was expected that an incident parallel beam can be focused in the focal point of the parabolas. To prove this statement the neutron intensity distribution at different distances behind the guide was recorded by means of a standard, high-resolution radiography detector. The experiments were performed at the V12b instrument at HMI with different levels of beam monochromatization demonstrating maximum intensity gains of about 25. The consideration for using the focusing guide for the purposes of cold neutron radiography will be presented.