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Three axes spin echo spectrometer
TRISP is a high-resolution neutron spectrometer combining the three axes and neutron resonance spin echo (NRSE) techniques. The design of TRISP is optimised for the study of intrinsic linewidths of elementary excitations (phonons, magnons) with an energy resolution in the µeV region over a broad range of momentum and energy transfers. Compared to conventional three axes spectrometers (TAS), this corresponds to an improvement of the energy resolution of one to two orders of magnitude.
TRISP also incorporates the Larmor diffraction (LD) technique, which allows to measure lattice spacings with a relative resolution Δd/d = 1.5·10-6, i.e. one to two orders of magnitude better than conventional neutron or X-ray diffraction. Absolute d-values can be determined by calibrating the instrument against an Si standard. The main applications of LD include thermal expansion under pressure and low or high temperature, and distributions of lattice constants (second order stresses). LD thus is unique in a parameter region, where standard methods such as dilatometry fail.
Besides the standard sample environment a dedicated dilution cryostat with a base temperature of 6 mK is available.
Dr. Thomas Keller
Phone: +49 (0)89 289-12164
Prof. Dr. Bernhard Keimer
Phone: +49 (0)711 689-1650
Phone: +49 (0)89 289-14816
Find the latest publications regarding TRISP in our publication database iMPULSE:
Max-Planck-Institut für Festkörperforschung and Heinz Maier-Leibnitz Zentrum. (2015). TRISP: Three axes spin echo spectrometer. Journal of large-scale research facilities, 1, A37. http://dx.doi.org/10.17815/jlsrf-1-41
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