Neutron resonance spin-echo upgrade at the three-axis spectrometer FLEXX

The Review of Scientific Instruments
F GroitlK Habicht

Abstract

We describe the upgrade of the neutron resonance spin-echo setup at the cold neutron triple-axis spectrometer FLEXX at the BER II neutron source at the Helmholtz-Zentrum Berlin. The parameters of redesigned key components are discussed, including the radio frequency (RF) spin-flip coils, the magnetic shield, and the zero field coupling coils. The RF-flippers with larger beam windows allow for an improved neutron flux transfer from the source to the sample and further to the analyzer. The larger beam cross sections permit higher coil inclination angles and enable measurements on dispersive excitations with a larger slope of the dispersion. Due to the compact design of the spin-echo units in combination with the increased coil tilt angles, the accessible momentum-range in the Larmor diffraction mode is substantially enlarged. In combination with the redesigned components of the FLEXX spectrometer, including the guide, the S-bender polarizer, the double focusing monochromator, and a Heusler crystal analyzer, the count rate increased by a factor of 15.5, and the neutron beam polarization is enhanced. The improved performance extends the range of feasible experiments, both for inelastic scattering on excitation lifetimes in single c...Continue Reading

References

Jul 1, 2006·Science·S P BayrakciB Keimer
Jun 30, 2007·Science·C PfleidererA Rosch
Jun 2, 2014·The Review of Scientific Instruments·F LiR Pynn
Aug 3, 2014·The Review of Scientific Instruments·N MartinW Häußler

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Citations

Jun 6, 2018·The Review of Scientific Instruments·B NagyL Bottyán
Feb 13, 2020·Journal of Applied Crystallography·Thomas KellerBernhard Keimer

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