The theory of compact and efficient circular-pore MCP neutron collimators
The theory of compact and efficient circular-pore MCP neutron collimators
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DOI：
10.1016/j.nima.2005.11.068
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发表时间：
2006-01
影响因子：
1.4
通讯作者：
A. Tremsin;W. B. Feller
中科院分区：
文献类型：
--
作者：
A. Tremsin;W. B. Feller
讨论了一种基于微通道板（MCP）的新型冷热中子准直器。与广泛使用的索勒狭缝准直器相比，MCP同时在两个维度上准直中子束，并且它们非常紧凑。本文所描述的圆孔MCP准直器性能的详细模型可用于优化MCP参数，以实现给定应用的最有效准直。这些参数包括MCP几何尺寸、吸收原子的类型及其在MCP玻璃混合物中的浓度，所有这些都受到制造限制的约束。该模型预测，MCP准直器可以是非常有效的（摇摆曲线<0.1°宽，在机翼中具有高背景抑制）和非常紧凑的（只有几毫米厚）。除了准直之外，相同的MCP还可以用于具有高空间（1020 μm）和时间（101 μs）分辨率的中子成像，为同时进行束流准直和监测开辟了新的可能性。
A novel type of thermal and cold neutron collimator based on microchannel plates (MCPs) doped with neutron-absorbing atoms is discussed. In contrast to widely used Soller slit collimators, the MCPs collimate a beam of neutrons in two dimensions simultaneously and they are very compact. A detailed model of the circular-pore MCP collimator performance, described in this paper, can be used for optimization of MCP parameters in order to achieve the most efficient collimation for a given application. Among these parameters are the MCP geometrical dimensions, the type of absorbing atoms and their concentration in the MCP glass mixture, all constrained by the manufacturing limitations. The model predicts that the MCP collimators can be very efficient (rocking curve <0.1° wide with high background suppression in the wings) and very compact (only a few mm thick). In addition to collimation, the same MCPs can also be used for neutron imaging with a high spatial (∼20μm) and temporal (∼1μs) resolution, opening up new possibilities for simultaneous beam collimation and monitoring.