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Neutron resonance spin-echo upgrade at the three-axis spectrometer FLEXX
F Groitl1, T Keller2, D L Quintero-Castro1
1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.
The Review of Scientific Instruments
|March 2, 2015
Summary
The neutron resonance spin-echo setup at the FLEXX spectrometer has been upgraded, enhancing neutron flux and polarization. This upgrade significantly expands experimental capabilities for inelastic scattering and Larmor diffraction studies.
Area of Science:
- Condensed Matter Physics
- Neutron Scattering Techniques
Background:
- The cold neutron triple-axis spectrometer FLEXX at the BER II neutron source is a key instrument for materials research.
- Neutron resonance spin-echo (NRSE) spectroscopy is a powerful technique for probing magnetic excitations and structures.
Purpose of the Study:
- To describe the comprehensive upgrade of the NRSE setup on the FLEXX spectrometer.
- To detail the performance improvements and expanded experimental capabilities resulting from the upgrade.
Main Methods:
- Redesign and implementation of key NRSE components: radio frequency (RF) spin-flip coils, magnetic shield, and zero field coupling coils.
- Integration of upgraded components with existing FLEXX spectrometer elements (guide, polarizer, monochromator, analyzer).
- Experimental characterization of the enhanced instrument performance.
Main Results:
- Increased neutron flux transfer by a factor of 15.5 due to larger beam windows and optimized components.
- Enhanced neutron beam polarization.
- Substantially enlarged accessible momentum range in Larmor diffraction mode due to compact design and increased coil tilt angles.
Conclusions:
- The upgraded NRSE setup on FLEXX offers significantly improved performance and extended experimental capabilities.
- The enhancements enable high-resolution studies of excitation lifetimes and Larmor diffraction.
- The improved instrument is now available to the scientific community for advanced research.
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