Groitl Felix, Toft-Petersen Rasmus, Quintero-Castro Diana Lucia, Meng Siqin, Lu Zhilun, Huesges Zita, Le Manh Duc, Alimov Svyatoslav, Wilpert Thomas, Kiefer Klaus, Gerischer Sebastian, Bertin Alexandre, Habicht Klaus
Laboratory for Quantum Magnetism, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232, Villigen, Switzerland.
Sci Rep. 2017 Oct 20;7(1):13637. doi: 10.1038/s41598-017-14046-z.
The first experimental characterization of a multiple energy analysis wide angle backend for a cold triple-axis spectrometer is reported. The multi-analyzer module MultiFLEXX employs 155 detection channels which simultaneously probe an extensive range in wavevector and energy transfer. Successful mapping of magnetic excitations in MnF and Ho demonstrate order of magnitude gains in data collection efficiency using this novel type backend. MultiFLEXX is competitive to standard triple-axis spectroscopy in terms of energy resolution and signal-to-noise ratio. A minority of the detector channels is affected by spurious signals inherent to this multiplexing concept. The characteristic signature of these spurious signals easily allows for their discrimination. The instrument concept focuses on detection efficiency in the horizontal scattering plane which makes it an ideal technique for fast mapping and parametric studies including extreme sample environment.
报道了用于冷三轴光谱仪的多能量分析广角后端的首次实验表征。多分析仪模块MultiFLEXX采用155个检测通道，可同时探测波矢和能量转移的广泛范围。在MnF和Ho中成功绘制磁激发图，证明使用这种新型后端可使数据收集效率提高一个数量级。MultiFLEXX在能量分辨率和信噪比方面与标准三轴光谱法具有竞争力。少数探测器通道受到这种复用概念固有的杂散信号影响。这些杂散信号的特征标记很容易辨别它们。该仪器概念专注于水平散射平面中的检测效率，使其成为快速绘图和参数研究（包括极端样品环境）的理想技术。
