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

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Lichtenbergstr.1
85748 Garching

DNS

Polarised neutron scattering instrument with time-of-flight inelastic scattering option

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.).

Insrumentscheme DNS Insrumentscheme DNS

DNS is a versatile polarised neutron scattering instrument that is ideally suited to study both short-range and long-range magnetic correlations in quantum materials, strongly correlated electrons, unconventional superconductors, and functional magnetic materials. In addition to the diffraction mode, DNS also provides an option with time-of-flight inelastic neutron scattering, which can be used for the measurements of low-energy magnetic excitations.

With its compact size, a new-generation Fe/Si based focusing polarising bender and wide-angle polarisation analysers, DNS is optimised as a high intensity polarised instrument with medium resolution. It allows for the unambiguous separation of nuclear coherent, spin incoherent, and magnetic scattering contributions simultaneously over a large range of scattering vector Q and energy transfer E.

Typical Applications

DNS can be operated in both elastic and inelastic scattering mode with a wide range of applications,

Polarised elastic scattering options:
  • Polarised powder neutron diffraction with the XYZ-method [1-3]
  • Polarised single-crystal neutron diffraction [4]
  • Magnetic diffuse scattering with polarisation analysis [5-6]
  • Separation of nuclear coherent from spin incoherent scattering in soft condensed matter [7]
Time-of-flight (TOF) inelastic scattering options:
  • Standard TOF option on powder samples (in commissioning) [8]
  • Standard TOF option on single-crystal samples (under development)
  • Polarised TOF option (under development)

[1] Z.D. Fu, et al., New J. Phys. 12, 083044 (2010).
[2] A.M. Hallas, et al., Phys. Rev. Lett. 113, 267205 (2014).
[3] V. Pecanha-Antonio, et al., Phys. Rev. B 96, 214415 (2017).
[4] F. Zhu, et al., Phys. Rev. Research 2, 043100 (2020).
[5] L.J. Chang, et al., Nat. Commun. 3, 992 (2012).
[6] S. Gao, et al., Nat. Phys. 13, 157 (2017).
[7] C. Gerstl, et al., Macromolecules 45, 7293 (2012).
[8] I. Zivkovic, et al., Phys. Rev. Lett. 127, 157204 (2021).

Sample Environment
  • Top-loading CCR and cryo-furnace (4 – 400 K)
  • Orange-type cryostat (1.5 – 300 K)
  • Dilution insert (Tmin ≈ 75 mK)
  • He-3 insert (Tmin ≈ 500 mK)*
Technical Data
Monochromator
  • Neutron guide NL6-S
    • Horizontally and vertically adjustable, double-focusing
  • PG(002), d = 3.355 Å
  • Crystal dimensions: 2.5 × 2.5 cm2 (5 × 7 crystals)
  • Wavelength range: 2.4 Å < λ < 3.5 Å
Flux at sample
  • Estimated flux
    • non-polarised: ~ 2 · 107 n cm-2 s-1
    • polarised ~ 2 · 106 n cm-2 s-1
Neutron velocity selector
  • Resolution Δλ/λ: 30 – 40 %
Chopper
  • Chopper frequency: ≤ 300 Hz
  • Chopper disc: Titanium, 3 slits, Ø = 420 mm
Detector banks for non-polarised neutrons
  • 128 position sensitive 3He tubes
    • Ø = 1.27 cm, height ~100 cm
  • Total solid angle covered: 1.9 sr
  • Covered scattering angles in the horizontal plane: 0° < 2θ ≤ 135°
Detector banks for polarised neutrons
  • 24 detection units:
    • Polarisation analysis by m = 3 supermirror benders
    • 3He detector tubes, Ø = 2.54 cm, height 15 cm
  • Covered scattering angle in the horizontal plane: 0° < 2θ ≤ 150°
  • Qmax
    • λi = 2.4 Å (Ei = 14.2 meV): 4.84 Å-1
    • λi = 3.5 Å (Ei = 6.7 meV): 2.53 Å-1
Energy resolution
  • λi = 2.4 Å (Ei = 14.2 meV): 1 meV
  • λi = 3.5 Å (Ei = 6.7 meV): 0.5 meV

Instrument Scientists

Dr. Yixi Su
Phone: +49 (0)89 158860-714
E-Mail: y.su@fz-juelich.de

Dr. Thomas Müller
Phone: +49 (0)89 158860-730
E-Mail: t.mueller@fz-juelich.de

DNS
Phone: +49 (0)89 158860-502

Operated by

JCNS

News

Inelastic neutron scattering at DNS: off to a flying start

Inelastic neutron scattering at DNS: off to a flying start

Read more

Publications

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

impulse.mlz-garching.de

Citation of the instrument

Heinz Maier-Leibnitz Zentrum. (2015). DNS: Diffuse scattering neutron time-of-flight spectrometer. Journal of large-scale research facilities, 1, A27. http://dx.doi.org/10.17815/jlsrf-1-33

For citation please always include the DOI.

Gallery

DNS
DNS

Diffuse neutron scattering spectrometer DNS.

© W. Schürmann, TUM
DNS
DNS
© W. Schürmann, TUM

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: