The JCNS neutron spin-echo spectrometer J-NSE at the FRM II
The JCNS neutron spin-echo spectrometer J-NSE at the FRM II
复制标题
DOI：
10.1088/0957-0233/19/3/034022
复制
发表时间：
2008-03-01
影响因子：
2.4
通讯作者：
Richter, D.
中科院分区：
文献类型：
--
作者：
Holderer, O.;Monkenbusch, M.;Richter, D.
中子自旋回波谱(NSE)由于其高能量分辨率，是一种非常适合于研究慢动力学的方法，如软物质系统(玻璃、聚合物和复杂液体)的动力学，或自旋玻璃的顺磁性质。自1996年以来，Julich NSE光谱仪一直在Julich研究反应堆FRJ-2上运行。它现在已经转移到TU Munchen的新的研究反应堆FRM II，在那里它刚刚开始继续运行。在转移的背景下，对光谱仪的部分部件进行了更新和改进，导致了更大的能量分辨率和更大的动态范围。在其他方面，已经设计和制造了新的校正线圈，使我们能够在主旋进线圈中使用更高的电流。J-NSE的中子导引系统允许波长在4.5到16埃之间变化。较大的60×60 mm(2)的中子导出口、较高的中子通量、可在较大范围内改变波长的可能性以及较好的校正元件将仪器的性能推至傅里叶时间tau=1 ps至约350 ns，Q范围为0.02-1.5埃(-1)。我们在这里描述了J-NSE的技术变化和改进，并展示了用重新安装的光谱仪测量的第一个自旋回波。
Neutron spin echo (NSE) spectroscopy is, due to its high energy resolution, a well-suited method for studying slow dynamics, such as the dynamics of soft matter systems (glasses, polymers and complex liquids), or paramagnetic properties of, e.g., spin glasses. The Julich NSE spectrometer has been in operation at the Julich research reactor FRJ-2 since 1996. It has been transferred now to the new research reactor FRM II of the TU Munchen, where it just started to continue operation. In the context of the transfer, parts of the spectrometer have been renewed and improved, leading to a significantly larger energy resolution and a larger dynamic range. Amongst other things, new correction coils have been designed and manufactured, allowing us to use higher currents in the main precession coils. The neutron guide system of the J-NSE allows the variation of the wavelength between about 4.5 to 16 angstrom. A larger neutron guide exit of 60 x 60 mm(2), the higher neutron flux, the possibility of varying the wavelength over a broad range and the better correction elements push the performance of the instrument to Fourier times tau = 1 ps to about 350 ns, with a q-range of q = 0.02-1.5 angstrom(-1). We describe here the technical changes and improvements of the J-NSE and show the first spin echoes measured with the reinstalled spectrometer.