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首页> 外文期刊>Quantum Beam Science >A Pulse-Multiplication Proposal for MIRACLES, the Neutron TOF-Backscattering Instrument at the European Spallation Source
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A Pulse-Multiplication Proposal for MIRACLES, the Neutron TOF-Backscattering Instrument at the European Spallation Source

机译：奇迹的脉冲乘法提案，欧洲椎间晶源中的中子TOF-反向散射仪器

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The fixed-energy window scan approach, for both elastic and inelastic modes, is a valuable tool to discriminate between motions activated when dynamical phase transitions occur in a sample as a function of time, temperature, pressure, electrical field or illumination. Considering that, on one hand, such variations can generate a weak signal, and on the other, high data throughput makes it possible to screen many samples during a beam time, pulse multiplication is an ideal strategy to optimize the intensity of the analyzed signal. To ensure this capability, a proposal for a future upgrade of MIRACLES, the neutron time-of-flight backscattering spectrometer at the European Spallation Source (ESS) under construction in Lund, is reported in this article. The concept for a new chopper layout relies on the extraction of several elastic pulses, ensuring an increase in the neutron total elastic intensity hitting the sample. This proposal can be extended to the inelastic counterpart. The premise is to maintain the original beamline layout without modification, either of the guide sections or of the current chopper layout of MIRACLES, thereby guaranteeing that minimal changes and impact will occur during the proposed upgrade. However, this also presents a significant challenge, namely, to achieve an efficient pulse multiplication within the width and the length of the guide and within the rising/decay time of the pulses. With the concept presented here, an increase in elastic intensity by a factor of 2.8 was obtained. This is analogous to performing elastic fixed window (EFW) measurements with an ESS source operating at 14 MW, widening considerably the performance capabilities of MIRACLES. The knowledge generated here is also valuable for the design of scientific instruments for the next generation of low-energy, accelerator-driven neutron sources.
机译：用于弹性和非弹性模式的固定能窗扫描方法是当作为时间，温度，压力，电场或照明的函数发生动态相转变时，当动态相转变发生动态相变时，可以在激活的动作之间区分运动的有价值的工具。考虑到，一方面，这种变化可以产生弱信号，并且在另一个中，高数据吞吐量使得可以在光束时间期间筛选许多样本，脉冲乘法是优化分析信号强度的理想策略。为确保这种能力，本文报告了在隆德建设中，欧洲椎间源泉（ESS）的未来升级，中子飞行时间反散射仪的提案。新的斩波布局的概念依赖于若干弹性脉冲的提取，确保中子总弹性强度的增加击中样品。该提案可以扩展到非弹性对应物。前提是为了维持原始的光束线布局而不进行修改，指导部分或当前的径向奇迹布局的奇迹，从而保证在建议的升级期间会发生最小的变化和影响。然而，这也提出了重大挑战，即，在脉冲的宽度和长度内实现高效的脉冲倍增，以及在脉冲的上升/衰减时间内。利用此处呈现的概念，获得了弹性强度增加了2.8因子。这类似于使用在14兆瓦运行的ESS源进行弹性固定窗口（EFW）测量，大大加宽奇迹的性能能力。这里产生的知识对下一代低能量，加速器驱动的中子源的设计也很有价值。

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