Löhmann Oliver, Silvi Luca, Kadletz Peter M, Vaytet Neil, Arnold Owen, Jones Matthew D, Nilsson Jonas, Hart Michael, Richter Tobias, von Klitzing Regine, Jackson Andrew J, Arnold Thomas, Woracek Robin
Technische Universität Darmstadt, Hochschulstraße 8, D-64289 Darmstadt, Germany.
Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-MeitnerPlatz 1, D-14109 Berlin, Germany.
Rev Sci Instrum. 2020 Dec 1;91(12):125111. doi: 10.1063/5.0014207.
The European Spallation Source (ESS), which is under construction in Lund (Sweden), will be the next leading neutron facility with an unprecedented brilliance and novel long-pulse time structure. A long-pulse source not only provides a high time-average flux but also opens the possibility to tune the resolution by using pulse shaping choppers. Thus, an instrument can readily be operated in either a high flux or a high resolution mode. Several of the shorter instruments at the ESS will employ Wavelength Frame Multiplication (WFM) in order to enable a sufficient resolution while offering a continuous and broad wavelength range. A test beamline was operated until the end of 2019 at the research reactor in Berlin to test components and methods, including WFM, in order to prepare the new facility for the operation of neutron instruments and successful first science. We herein demonstrate the implementation of WFM for reflectometry. By selecting a short pulse mode under the same geometrical configuration, we compare and discuss the results for two reference samples. The reported experiments not only serve to prove the reliability of the WFM approach but also, for the first time, demonstrate the full instrument control, data acquisition and data reduction chain that will be implemented at the ESS.
正在瑞典隆德建设的欧洲散裂中子源（ESS）将成为下一个具有空前亮度和新型长脉冲时间结构的领先中子设施。长脉冲源不仅能提供高时间平均通量，还为通过使用脉冲整形斩波器来调节分辨率提供了可能。因此，一台仪器可以很容易地在高通量或高分辨率模式下运行。ESS的一些较短的仪器将采用波长帧倍增（WFM）技术，以便在提供连续且宽广的波长范围的同时，实现足够的分辨率。一条测试束线于2019年底前在柏林的研究反应堆运行，以测试包括WFM在内的部件和方法，为新设施运行中子仪器并成功开展首批科学研究做准备。我们在此展示了用于反射测量的WFM技术的实施情况。通过在相同几何配置下选择短脉冲模式，我们对两个参考样品的结果进行了比较和讨论。所报道的实验不仅有助于证明WFM方法的可靠性，还首次展示了将在ESS实施的完整仪器控制、数据采集和数据处理流程。
