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85748 Garching

RESEDA

Resonance spin echo spectrometer

RESEDA scheme RESEDA scheme

The neutron spin echo spectrometer RESEDA (Resonance Spin Echo for Diverse Applications) is dedicated to the exploration of slow dynamics and fluctuations in hard and soft condensed matter systems. RESEDA is located at the end position of NL5-S in the Neutron Guide Hall West. Following a major revision and upgrade, RESEDA now permits longitudinal NRSE (LNRSE) spectroscopy as well as longitudinal MIEZE (Modulation of Intensity with zero effort) operation with sub-µeV energy resolution and an unprecedented dynamic range. When operated as a MIEZE spectrometer, data may be recorded readily in depolarizing sample environments, such as very large magnetic fields. Likewise, depolarizing substances, such as ferromagnets or superconductors, strong incoherent scattering materials containing, for instance, hydrogen may be studied.

RESEDA's LNRSE option represents a set-up akin a conventional NSE spectrometer. Conventional NSE coils between the resonant flipper coils may be used for field integral subtraction, thereby massively extending the dynamic range. Typical momentum transfers currently accessible are between 0.035 Å-1 and 1 Å-1. Remarkably, even for the highest resolutions reached so far, exceeding 50 ns, no correction coils are required.

A unique feature of RESEDA is the MIEZE set-up for studies under depolarizing conditions. MIEZE also proves to be extremely successful in combination with SANS (MIEZE-SANS) where scientific challenges in ferromagnets, superconducting vortex lattices, and magnetic skyrmion systems have been addressed recently. The implementation of phase-locking of the neutron polarization enables inelastic measurements as demonstrated for magnons in ferromagnetic iron, where the intermediate scattering function features an oscillatory component. The standard range of scattering vectors ranges here from 0.005 Å-1 to 1 Å-1 at spin echo times from 0.1 ps up to 10 ns. For neutron detection the MIEZE option uses a bespoke Cascade 2D position sensitive detector with an active area of 200 × 200 mm². An application to calculate the signal reduction factor for various sample geometries can be found within the FRM2 WebApps.

Typical Applications
  • dynamics and diffusion of polymer melts
  • dynamics of water in porous media
  • diffusion processes in ionic liquids
  • dynamics of soft biological systems
  • freezing of glasses and spin glasses
  • critical magnetic fluctuations
  • melting of superconducting vortex lattices
  • dynamics at quantum phase transitions
  • dynamics of magnetized thin foils
  • emergent excitations in quantum magnets
Sample Environment

At RESEDA the whole sample environment of the MLZ is applicable. Depolarising conditions are limited to MIEZE experiments.

  • Available temperature range: 50 mK (dilution insert, see below) up to more than 1300 K (high temperature furnace, non-depolarising)
  • Maximal magnetic field: 12 T
  • Available cryostats:
    • Closed cycle cryostat: (3.5 K < T < 300 K)
    • 3He insert: (450 mK < T < 300 K)
    • Dilution insert: (50 mK < T < 6 K)
Technical Data

Primary beam:

  • Neutron guide: NL5-S
  • Guide cross section: 36 × 36 mm2
  • Wavelength range: λ = 3.5 – 15 Å
  • Wavelength bandwidth at sample position: Δλ/λ = 9 – 17%
  • Polarizer: double V-cavity (length: 2 m, coating: m = 5)
  • Collimation (optional):
    • two motorized cross slits 0-50 mm opening
    • cross collimators 20’, 40’, and 80’

Spectrometer:

Two Spectrometer arms MIEZE (SANS measurements possible) and L-NRSE

  • MIEZE:
    • T-bender 40 × 40 mm² m = 5
    • Detector: CASCADE 2D PSD 200 × 200 mm², 100 ns time resolution
  • L-NRSE:
    • Detector: ³He counter 25.4 mm (1 inch) diameter

Characteristic parameters:

  • Flux at sample position: φ ≥ 107 n cm-2 s-1 (at λ = 5.3 Å)
  • Maximum scattering angle: 2θ = 93° (L-NRSE), 55° (MIEZE)
  • Maximum scattering vector: Q = 2 Å-1 (at λ = 4.5 Å)
  • Spin echo time range: τ = 0.001– 20 ns (at λ = 10 Å)
  • Energy resolution: 0.03 µeV – 81.82/ λ² [Å] meV

Instrument Scientists

Dr. Christian Franz
Phone: +49 (0)89 289-14760
E-Mail:

Dr. Johanna K. Jochum
Telefon: +49 (0)89 289-14760
E-Mail:

RESEDA
Phone: +49 (0)89 289-14874

Operated by

TUM

Publications

Find the latest publications regarding RESEDA in our publication database iMPULSE:

impulse.mlz-garching.de

Citation of the instrument

Heinz Maier-Leibnitz Zentrum. (2015). RESEDA: Resonance spin echo spectrometer. Journal of large-scale research facilities, 1, A14. http://dx.doi.org/10.17815/jlsrf-1-37

For citation please always include the DOI.

Gallery

secondary spectrometer arms of RESEDA
secondary spectrometer arms of RESEDA

L-NRSE and L-MIEZE secondary spectrometer arms of RESEDA

Side view of the L-NRSE setup at RESEDA
Side view of the L-NRSE setup at RESEDA

Side view of the L-NRSE setup at RESEDA © Olaf Soltwedel

MLZ is a cooperation between:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Geesthacht> Helmholtz-Zentrum GeesthachtForschungszentrum Jülich> Forschungszentrum Jülich
Finally!
MLZ App (Android)
MLZ App> MLZ App