论文标题
地面移动对欧洲剥落源的现实指南模型的影响
Effects of ground movements on realistic guide models for the European Spallation Source
论文作者
论文摘要
我们通过基于经验经验的地面运动对通过射线追踪模拟的长中子指南的运输特性进行建模。我们的结果重现了一项简单模型的早期研究发现的巨大损失，而对于更逼真的指导安装模型，我们发现损失明显小于早期所预测的。对欧洲散布来源的冷中子光谱仪双色指南的详细研究表明，波长为2.3-4.0Å的波长为7.0（5）％；仪器的典型操作波长范围。正如先前工作中建议的那样，这种损失并不要求通过耗尽来缓解。我们的工作旨在量化全球中性设施的建设或规划中长中子指南的运输特性的鲁棒性。
We model the effect of ground movement, based on empirical experience, on the transport properties of long neutron guides by ray-tracing simulations. Our results reproduce the large losses found by an earlier study for a simple model, while for a more realistic engineering model of guide mounting, we find the losses to be significantly smaller than earlier predicted. A detailed study of the guide for the cold neutron spectrometer BIFROST at the European Spallation Source shows that the loss is 7.0(5) % for wavelengths of 2.3-4.0 Å; the typical operational wavelength range of the instrument. This amount of loss does not call for mitigation by overillumination as suggested in the previous work. Our work serves to quantify the robustness of the transport properties of long neutron guides, in construction or planning at neutron facilities worldwide.
