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MLZ (eng)

Lichtenbergstr.1
85748 Garching

MIRA

Cold three axes spectrometer (with optional focussing guides and polarization analysis)

MIRA MIRA

MIRA is a cold three axes spectrometer with wavelengths 3.5 Å < λ < 6 Å (1.2 < k < 1.6). Energy transfers from – 6 meV < ∆E < 3 meV can be reached.
The instrument's setup is modular and allows for various different cold neutron experiments such as diffraction, spectroscopy or reflectometry. A variety of different setup options can be combined allowing for a fast and flexible realization of neutron experiments using the options available:

  • Cold diffraction (using the elastic mode of instrument) with very low background
  • Cold three axes spectroscopy for extreme environments in pressure, magnetic field and temperature
  • Reflectometry
  • MIEZE spin echo
  • 3D-Polarimetry

Polarised neutrons are optional for all experimental setups at MIRA. Using the finger detector, the instrument has a very low background of less than 0.1 cps. MIRA can reach a q-range up to 2.5 Å-1 with a q-resolution of 0.01 Å-1.

Vertical and horizontal B-fields up to 2.2 T and vertical B-fields up to 12 T are available. Temperatures from 50 mK to 1500 K can be applied using the standard sample environment at MLZ.

Typical Applications
  • Dynamics of magentic excitations
  • Determination of magnetic structures, especially large scale structures, i.e. helical spin density waves or magnetic lattices
  • Quasi-elastic measurements in magnetic fields with high resolution
  • Determination of structures and dynamics in extreme environments, like pressure
  • Determination of layer thickness of films, for instance in polymer physics
  • Reflectometry from magnetic multilayers
  • Polarisation analysis
Technical Data

MIRA

Primary beam

  • Neutron guide: NL6-S
  • Dimensions: 60 × 120 mm2 (width x height)
  • Coating: sides m = 2.0, top/bottom m = 2

Monochromator

  • Horizontal focussing HOPG Δλ/λ ≈ 2 %
  • 3.5 Å < λ < 6 Å

max. differential flux at sample

  • 1 · 107 neutrons s-1 cm-2 at 4.7 Å
  • 1 · 106 neutrons s-1 cm-2 polarised

Analyzer

  • 2 cavities
  • S-bender, transmission polariser
  • 3He-Spin filter

Detector

  • 20 × 20 cm2 2-D PSD with 1 × 2 mm2 resolution
  • 1 inch 3He finger detector
  • 20 × 20 cm2 2-D PSD, time resolution < 1 ps
  • with low background < 0.1 cps

Instrument Scientists

Dr. Robert Georgii
Phone: +49 (0)89 289-14986
E-Mail:

MIRA
Phone: +49 (0)89 289-14877

Operated by

TUM

Publications

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

impulse.mlz-garching.de

Citation of the instrument

Heinz Maier-Leibnitz Zentrum. (2015). MIRA: Dual wavelength band instrument. Journal of large-scale research facilities, 1, A3. http://dx.doi.org/10.17815/jlsrf-1-21

The multi-purpose three-axis spectrometer (TAS) MIRA at FRM II
R.Georgii, T.Weber, G.Brandl, M.Skoulatos, M.Janoschek, S.Mühlbauer, C.Pfleiderer, P.Böni
NIMA 881, 11 February 2018, Pages 60-64
https://doi.org/10.1016/j.nima.2017.09.063

For citation please always include the DOI.

Gallery

MIRA-1
MIRA-1
MIRA-2
MIRA-2

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