The Jülich neutron spin-echo spectrometer — Design and performance

The new neutron spin-echo (NSE) spectrometer that recently went into operation in the guide hall ELLA of the DIDO reactor FRJ-2 in Jülich is described. Design consideration and measured performance data are reported. The innovation of magnetic decoupling by rigidly coupled compensation loops yields a number of benefits as ease of operation, stability and immediate access to high scattering angles. A new technical realization of the correction elements yields large area coverage and high transparency. Together with an area multidetector this results in a highly efficient neutron usage. The operation program allows for “set-and-run” operation without tuning increasing again the overall neutron economy.