MLZ is a cooperation between:

Technische Universität München> Technische Universität MünchenHelmholtz-Zentrum Hereon> Helmholtz-Zentrum Hereon
Forschungszentrum Jülich> Forschungszentrum Jülich

MLZ is a member of:

LENS> LENSERF-AISBL> ERF-AISBL

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MLZ (eng)

Lichtenbergstr.1
85748 Garching

MIRA

Three axes spectrometer (with optional focussing guides and polarisation analysis)

This instrument is focussed on cold neutrons. All parameters given here are valid during the current operation of FRM II. Please get in touch with the instrument team well in advance for all further details (length of experiment etc.).

Instrumentscheme MIRA Instrumentscheme MIRA

MIRA is a thermal three axes spectrometer with wavelengths 2.5 Å < λ < 4 Å (1.55 Å-1 < k < 2.5 Å-1). Energy transfers from -4 meV < ∆E < 9 meV can be reached. The instrument’s setup is modular and allows for various different cold neutron experiments such as diffraction, spec-troscopy 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:
  • Three axes setup in extreme environments (temperature, magnetic field and high pres-sure)
  • Diffraction (using the elastic mode of instrument) with very low background
  • Reflectometry
  • 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 0.05 Å-1.

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 structures and dynamics in extreme environments, like low tempera-ture, high magnetic field and high pressure
  • Laminar diffraction for instance in lipid physics
  • Reflectometry from magnetic multilayers
  • Polarisation analysis
Technical Data
Primary beam
  • Neutron guide: NL6
  • Dimensions: 60 × 120 mm2 (width x height)
  • Coating: sides m = 2.0, top/bottom m = 2
Monochromator
  • Horizontal focussing HOPG Δλ/λ ≈ 1 %
  • 2.5 Å < λ < 4 Å
max. differential flux at sample
  • 1 · 107 neutrons s-1 cm-2 at 3 Å
  • 5 · 106 neutrons s-1 cm-2 polarised
Analyser
  • 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: robert.georgii@frm2.tum.de

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

Operated by

TUM

News

Nested mirrors at MIRA

Nested mirrors at MIRA

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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 Hereon> Helmholtz-Zentrum Hereon
Forschungszentrum Jülich> Forschungszentrum Jülich

MLZ is a member of:

LENS> LENSERF-AISBL> ERF-AISBL

MLZ on social media: