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Lichtenbergstr.1
85748 Garching

PANDA

Cold three axes spectrometer

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 PANDA Instrumentscheme PANDA

The cold three axes spectrometer PANDA is located at the beam tube SR2 in the experimental hall of FRMII. With a neutron guide element in the beam tube, a short distance from the neutron source to the monochromator as well as double focussing monochromators and analysers a high neutron flux is achieved. Furthermore the instrument is optimised for a low background. The multi-detector option BAMBUS, providing 100 q-ΔE-channels simultaneously, is currently under commissioning.

Next to the normal properties of a cold TAS the range of possible energy transfers is overlapping with a thermal three axes spectrometer. Specifically for the use of thermal neutrons, a double focussing Cu-111 monochromator and a Si-111 monochromator (vertically fixed, horizontal adjustable focus) are available. Alongside setups with high Q-resolution or with polarised neutrons are possible. The sample environment is up to date and offers high magnetic fields and low temperatures.

The conducted experiments comprise e.g. the investigation of spin waves, crystal field excitations, phonons, excitations of low dimensional systems, quasielastic scattering and diffraction with energy resolution. The achieved results often contributed decisively to the exploration of unconventional superconductivity, magnetically frustrated systems and magnetism in low dimensional systems. Furthermore they deliver new insights in the research of lattice dynamics or material sciences.

Typical Applications
Magnetic properties
  • Spin-waves
  • Crystal field excitations
  • Excitations in low dimensional systems
  • Magnetic vs nuclear scattering
Lattice dynamics
  • Phonon dispersion
  • Polarisations vectors
General
  • Critical scattering at phase transitions
  • Magnon – phonon interaction
  • Soft mode
  • Central peak
  • Diffraction with analyser:
    • dE close to 0
    • high E & Q resolution
    • extremely low background
Sample Environment

The sample table of PANDA allows for a variety of sample environments, and may easily be adapted to user specific devices. Among other, PANDA disposes routinely operated sample environment for:

  • Available temperature range: 50 mK (dilution insert, see below) up to more than 1300 K (high temperature furnace)
  • Maximal vertical magnetic field: 12 T
  • Available cryostats:
    • Closed cycle cryostat: (3.5 K < T < 300 K)
    • 3He insert: (450 mK < T < 300 K)
    • Dilution insert: (50 mK < T < 6 K)
Technical Data
Monochromators
  • PG(002) (d = 3.355 Å)
    • 1.05 Å-1 < ki < 4.0 Å-1
    • variable horizontal and vertical focussing
  • Cu111 (d = 2.08 Å)
    • 1.8 Å-1 < ki < 7 Å--1
    • variable horizontal and vertical focussing
  • Si111 (d = 3.13 Å)
    • 1.2 Å-1 < ki < 5 Å-1
    • Fixed vertical and variable horizontal focussing
  • Heusler (d = 3.35 Å, polarised neutrons)
    • 1.1 Å-1 < ki < 4.0 Å-1
    • variable vertical focussing
Analysers
  • PG(002)
    • -130° < 2ΘA < 100°
    • 1.05 Å-1 < kf
    • variable horizontal focussing
  • Heusler (polarised neutrons)
    • -130° < 2ΘA < 100°
    • 1.05 Å-1 < kf
    • variable horizontal focussing
Detectors
  • 1” ³He tube (focussing mode)
  • 2” ³He tube (collimated mode))
Main parameters
  • Scattering angle at the sample: 5°< 2ΘS < 125° (moveable beam-stop)
  • Energy transfer: up to 20 meV
  • Momentum transfers : up to Q = 7 Å-1 (depending on ki)
Filters for higher order suppression
  • PG (l = 60 mm); kf = 2.57 Å-1 or 2.662 Å-1
  • Be (closed-cycle cryostat, T ≤ 45 K); kf = 1.55 Å-1
  • BeO (liq.-N2 cooled); kf = 1.33 Å-1

Instrument Scientist

Dr. Astrid Schneidewind
Phone: +49 (0)89 158860-749
E-Mail: a.schneidewind@fz-juelich.de

PANDA
Phone: +49 (0)89 158860-517

Operated by

JCNS

Funding

News

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Publications

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

impulse.mlz-garching.de

Citation of the instrument

Heinz Maier-Leibnitz Zentrum. (2015). PANDA: Cold three axes spectrometer. Journal of large-scale research facilities, 1, A12. http://dx.doi.org/10.17815/jlsrf-1-35

For citation please always include the DOI.

Gallery

PANDA
PANDA
© 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: