Development of a thermal neutron focusing device using neutron supermirrors
Development of a thermal neutron focusing device using neutron supermirrors
复制标题
使用中子超级镜开发热中子聚焦装置
DOI：
10.1063/1.1947883
复制
发表时间：
2005
影响因子：
1.6
通讯作者：
K. Soyama
中科院分区：
文献类型：
--
作者：
T. Osakabe;K. Soyama
中子聚焦是在极端条件下小样本实验中补偿微弱信号不可或缺的技术。我们描述了用于典型三轴中子谱仪的热中子聚焦装置的开发。该装置的长度为400mm，放置在第二准直器和样品位置之间。焦距距装置下游端150mm。该光学器件有 18 片由 3m NiC∕Ti 中子超级镜组成的圆形叶片。每个叶片末端的延伸部分在样本位置（即焦点）处相交。中子从每个叶片的内表面以相同的角度连续反射并到达样品位置。测试结果表明，对于30.5meV以下的中子能量，样品位置的中子强度增益增加2倍以上。
Neutron focusing is an indispensable technique used to compensate for weak signals in experiments under extreme conditions with tiny samples. We describe the development of a thermal neutron focusing device for a typical triple-axis neutron spectrometer. The device has a length of 400mm and is placed between the second collimator and the sample position. The focal length is 150mm from the downstream end of the device. The optic has 18 pieces of the circular blade consisting of 3m NiC∕Ti neutron supermirrors. The extensions of the end of each blade meet at the sample position, namely the focal point. Neutrons undergo successive reflection through the same angle from the inner surface of each blade and arrive at the sample position. The test results show that the gain of the neutron intensity at the sample position increases by a factor of 2 or more for the neutron energy below 30.5meV.