DNS
Polarised diffuse neutron scattering instrument with time-of-flight inelastic scattering option
This instrument is focussed on cold neutrons. Therefore, please carefully check the “Technical data WITHOUT cold source” section. Deviating parameters are in bold. The instrument team is happy to answer any further questions!
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 to measure low-energy magnetic excitations.
With its compact size, a new-generation Fe/Si-based focussing 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
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 [5-7]
- Separation of nuclear coherent from spin incoherent scattering in soft condensed matter [8]
Time-of-flight (TOF) inelastic scattering options:
- Standard TOF option on powder samples (in commissioning) [9]
- 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] W. Schweika, et al., Phys. Rev. X 12, 021029 (2022).
[8] C. Gerstl, et al., Macromolecules 45, 7293 (2012).
[9] 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
- 3He insert: Tmin ≈ 500 mK
Technical data WITHOUT cold source
Monochromator
- Neutron guide NL6-S
- Horizontally and vertically adjustable, double-focussing
- 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 ≤ 135°
- Qmax
- λ[i ] = 2.4 Å (E[i ]= 14.2 meV): 4.84 Å-1
- λ[i ] = 3.5 Å (E[i ] = 6.7 meV): 3.32 Å-1
Energy resolution
- λi = 2.4 Å (E[i ] = 14.2 meV): ~ 1 meV
- λi = 3.5 Å (E[i ] = 6.7 meV): ~ 0.5 meV
Technical data WITH cold source
Monochromator
- Neutron guide NL6-S
- Horizontally and vertically adjustable, double-focussing
- PG(002), d = 3.355 Å
- Crystal dimensions: 2.5 × 2.5 cm2 (5 × 7 crystals)
- Wavelength range: 2.4 Å < λ < 6 Å
Flux at sample
- Estimated flux
- Non-polarised: ~ 2 · 107 – 108 n cm-2 s-1
- Polarised: ~ 2 · 106 – 107 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 ≤ 135°
- Qmax
- λi = 2.4 Å (Ei = 14.2 meV): 4.84 Å-1
- λi = 6 Å (Ei = 2.27 meV): 1.93 Å-1
Energy resolution
- λi = 2.4 Å (Ei = 14.2 meV): ~ 1 meV
- λi = 6 Å (Ei = 2.27 meV): ~ 0.1 meV
Instrument scientist
Dr. Yixi Su
Phone: +49 (0)89 158860-714
E-mail: y.su@fz-juelich.de
DNS
Phone: +49 (0)89 158860-502
Operated by
Funding
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.
Instrument control
Gallery
DNS_1
DNS instrument (outside look)
© MLZ
DNS_2
DNS instrument (inside look)
© MLZ
DNS_3
Scientific example: Magnetic diffuse scattering from spiral spin liquid
© MLZ
DNS_4
Scientific example: Magnetic diffuse scattering from chiral spin liquid
© MLZ
DNS_5
Scientific example: Magnetic diffuse scattering from molecular magnets
© MLZ
DNS_6
Scientific example: Inelastic neutron scattering from quantum spin liquid
© MLZ
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