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首页> 外文期刊>Physica, B. Condensed Matter >Focusing parabolic guide for very small samples
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Focusing parabolic guide for very small samples

机译：聚焦抛物线导向，适用于非常小的样本

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Modern materials can often only be grown in small quantities. Therefore, neutron-scattering experiments are difficult to perform due to the low signal. In order to increase the flux at the sample position, we have developed the concept of a small focusing guide tube with parabolically shaped walls that are coated with supermirror m = 3. The major advantage of parabolic focusing is that the flux maximum occurs not at the exit of the tube. It occurs at the focal point that can be several centimeters away from the exit of the tube. We show that an intensity gain of 6 can easily be obtained. Simulations using the software package McStas demonstrate that gain factors up to more than 50 can be realised on a spot size of approximately 1.2 mm diameter. For PGAA we expect flux gains of up to three orders of magnitude if multiplexing is used. We show that elliptic ballistic guides lead to flux gains of more than 6. (C) 2004 Elsevier B.V. All rights reserved.
机译：现代材料通常只能少量种植。因此，由于信号低，很难进行中子散射实验。为了增加样品位置处的通量，我们开发了一种小型聚焦导管的概念，该导管具有抛物面形的壁，并覆盖有超镜m =3。抛物线聚焦的主要优点是最大通量不会出现在管的出口。它发生在离管子出口几厘米远的焦点处。我们表明可以轻松获得6的强度增益。使用McStas软件包进行的仿真表明，在直径约为1.2 mm的光斑尺寸上，可以实现高达50以上的增益因子。对于PGAA，如果使用多路复用，我们预计通量增益最多可达三个数量级。我们显示椭圆弹道导引的通量增益超过6。（C）2004 Elsevier B.V.保留所有权利。

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