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

KWS-1

Small angle scattering diffractometer

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 KWS-1 Insrumentscheme KWS-1

The 20 % wavelength selector of the KWS-1 allows performing scattering experiments on larger colloids or concentrated soft matter systems. In addition, magnetic materials can also be studied with polarised neutrons [1]. A polariser with 3 cavities, each having a V-shaped supermirror, is placed in front of the collimation. The full wavelength band can be covered with min. 90 % (95 % typical) polarisation. A radio frequency spin flipper allows reverting the polarisation. Horizontal and vertical magnets are provided to render the magnetic field at the sample position.

The MgF2 lenses are used for the high flux mode with large sample areas, while the resolution stays in the classical SANS range. Biological samples can be handled due to the detector distance of ca. 1 m, which allows a maximal scattering vector of Q = 0.5 Å-1.

[1] Feoktystov, A. et al., J. Appl. Cryst. 48 (2015), 61-70

Typical Applications
  • Large colloids
  • Concentrated soft matter systems
  • Magnetic materials/ nanoparticles
Sample Environment
  • Rheometer shear sandwich
  • Rheowis-fluid rheometer (max. shear rate 104 s-1)
  • Anton-Paar fluid rheometer
  • (Stopped flow cell)
  • Sample holders: 9 horizontal x 3 vertical (temperature controlled)
  • Quartz cells
  • Water thermostat (range +10 – +90 °C), electric thermostat (RT – 200 °C)
  • 8-positions thermostated (Peltier) sample holder (-40 – 150° C)
  • Magnet (horizontal, vertical)
  • Cryostat with sapphire windows
  • High temperature furnace
  • Pressure cells (500 bar, 2 kbar, 5 kbar)
Technical Data
Overall performance
  • Q = 0.003 – 0.5 Å-1
  • Maximal flux: some 107 n cm-2 s-1
  • Typical flux: some 106 n cm-2 s-1 (collimation 4 m, aperture 50 × 50 mm², λ = 4.5 Å)
Velocity selector
  • Dornier, FWHM 20 %, λ = 4.5 Å – 12 Å
Polariser
  • 3 cavities with V-shaped supermirrors, for all wavelengths
  • Polarisation at least 90 %, typical 95 %
Spin-flipper
  • Radio-Frequency (spin flip probability better than 99.8 %)
Active apertures
  • 2 m, 4 m, 8 m, 14 m, 20 m
Aperture sizes
  • Rectangular 1 × 1 mm2 – 50 × 50 mm2
Sample aperture
  • Rectangular 1 × 1 mm2 – 30 × 30 mm2
Neutron lenses
  • MgF2, diameter 50 mm, curvature 20 mm
  • 3 packs with 4, 6, and 16 lenses
Sample stage
  • Hexapod, resolution better than 0.01 mm, 0.01°
Detector
  • Detection range: 1.5 m – 20 m
  • 3He gas detector
  • Efficiency better than 75 % (5 Å)
  • Spatial resolution 8 × 8 mm2,
  • 1 m² active area
  • Maximal countrate 2 MHz (τdead = 0.07 μs)

Instrument Scientists

Dr. Henrich Frielinghaus
Phone: +49 (0)89 158860-706
E-Mail: h.frielinghaus@fz-juelich.de

Dr. Artem Feoktystov
Phone: +49 (0)89 158860-746
E-Mail: a.feoktystov@fz-juelich.de

Dr. Zakaria Mahhouti
Phone: +49 (0)89 158860-805
E-Mail: z.mahhouti@fz-juelich.de

KWS-1
Phone: +49 (0)89 158860-508

Operated by

Logo JCNS

Funding

News

ERuM Pro Project NHSM

ERuM Pro Project NHSM

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Publications

Find the latest publications regarding KWS-1 in our publication database iMPULSE:

impulse.mlz-garching.de

Citation of the instrument

Heinz Maier-Leibnitz Zentrum. (2015). KWS-1: Small-angle scattering diffractometer. Journal of large-scale research facilities, 1, A28. http://dx.doi.org/10.17815/jlsrf-1-26

For citation please always include the DOI.

Gallery

KWS-1
KWS-1
© W. Schürmann, TUM

Fluid rheometer in beam.

©

2D scattering pattern of a self-organized ensemble of magnetic nanoparticles under an applied magnetic field.

Helmholtz coils with low-background cryostat (120 G, 5-300 K) and 3He spin filter as a polarisation analyser.

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: