TASP:

Triple Axis Spectrometer for Polarized Neutrons
Instrument responsibles: Dr. B. Roessli , Dr. A.Podlesnyak

History
The triple-axis-spectrometer TASP with polarised cold neutrons has been commissioned at the end of September 1997 at the SINQ spallation source. This instrument is devoted to measure collective magnetic excitations with high momentum and energy resolution .


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Layout Picture Flux Benders

Technical Specifications
Distance cold source - TASP 54 m
Monochromator scattering angle 31° < 2 q M < 135°
Analyser scattering angle -145° < 2 q A < 145°
Neutron energy (PG 002) 2.1 meV < EM < 25 meV
6.24 Å > lM > 1.81 Å
1.0 Å-1 < k M < 3.8 Å-1
Sample Scattering Angle 2 qS < 135°
Sample environment maximum load 500 kg
Inpile collimation 10', 20', 40', 80', open
External collimation 5', 10', 20', 40', 80', open
Detector 3He
Typical spectrometer resolution (FWHM)
(for 20'-20'-20'-20')		 DE = 10 µeV (E M = 2.1 meV)
DE = 0.5 meV (EM = 14.7 meV)
Filters cooled Be, pyrolytic graphite



Some Specificities

TASP occupies the end position of the neutron guide 1RNR14
that has a critical wavelength l* = 1.7 Å -1.
The special features of the instrument are:

  • Collimation of the Beam before the Monochromator
  • W-configuration Possible for all Accessible Scattering Vectors
  • Polarization Capability using HOPG combined with polarising Benders
  • Vertically Focusing Monochromator
  • Horizontally Focusing Analyser
  • 4-circle option (10 K < T < 300 K )



Sample environment
Temperature
  • 3He/4He dilution cryostat
  • 4He (orange) cryostat
  • 4He (orange) cryofurnace (1.5 K - 600 K)
  • Closed cycle refrigerator
  • Furnaces 300 K < T < 2100 K

Magnetic fields
  • Superconducting magnet: 5T vertical
  • Electromagnet 1T horizontal
  • Guide fields: 30mT vertical, 2mT horizontal

Pressure
  • Uniaxial pressure device

More About Sample Environment


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B.Roessli , Last Modified : Feb 15, 2002