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使用单个调节相格的中子干扰计

I Hidrovo¹, J Dey¹, H Meyer¹

¹Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

The Review of scientific instruments

|December 11, 2023

概括

对于中子相对比图像的新型单晶格式干扰仪,比以前的多晶格式系统提供了更高的可见度和相位灵敏度. 这一进步简化了对齐,并提高了中子网干涉测量的性能.

科学领域:

中子光学和干涉测量
材料科学和成像学材料科学和成像学

背景情况:

中子电网干涉测量提供相位,小角散射和衰减信息.
现有的相网格莫雷干扰仪 (PGMI) 使用两个或三个网格,需要复杂的对齐.
塔尔博特-劳干扰仪 (TLI) 使用吸收,减少中子流.

研究的目的:

从理论和计算上证明一种用于冷中子的新型单调节相格子 (MPG) 干扰仪.
将MPG系统的性能与现有的双相格子PGMI和传统TLI系统进行比较.
评估MPG系统在高性能,简化中子相对比成像方面的潜力.

主要方法:

单调相格 (MPG) 具有双调制 (大周期和载波距) 的理论分析.
使用Sommerfeld-Rayleigh衍射积分来模拟MPG系统的模拟.
模拟的MPG性能 (可见度,相位灵敏度) 与PGMI和TLI文献中的实验数据进行比较.

主要成果:

理论上,MPG系统的可见度有所提高 (94.2%),与双相格子PGMI (39%) 相比.
模拟的MPG可见性是通过可比的源到探测器距离来实现的.
MPG系统的理论相位灵敏度 (从4.1×103到10.0×103) 与传统的TLI相等或更高.

结论:

拟议的单调相格子 (MPG) 系统为中子相对比成像提供了高性能替代方案.
MPG系统通过避免对齐多相网格的需要,简化了实验设置.
这一进步对增强的中子网干涉测量应用具有前景.

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