E1

Thermal Neutron 3-Axis Spectrometer

Instrument description

Applications

  • ellastic experiments, if very low background is needed
  • very limited performance on the field of inellastic neutron scattering

Selected examples

incommensurate-commensurate phase transition in CsCuCl

Instrument Data
Neutron guide D 1N
Collimation α1 = 70' (= open), 30', fan (can be changed remotely)
α2 = 80' (= open), 40', 20' (can be changed remotely)
α3, α4 = 40', 20' (can be changed manually)
Monochromator • PG 002 with variable horizontal and vertical curvature
• Ge 311 with variable horizontal and vertical curvature
Take off angle of monochromator M = 21.3°
Wave length range • 2.44 Å (PG 002)
• 1.24 Å (Ge 311 )
Energy range • PG 002: 0 - 12 meV
• Ge 311: 0 - 25 meV
Energy resolution • PG 002, collimation fan - 20' 20': 0.27 meV
• PG 002, collimation 30' 40' 40' 40': 0.70 meV
• Ge 311, collimation fan - 20' 20': 2.2 meV
• Ge 311, collimation 30' 40' 40' 40': 4.3 meV
Range of scattering angles -20° < 2ΘS < 110°
Detector He3 single detector
Analyzer PG 002 flat
Range of final energies -140° < 2ΘA < 140°
Scattering angle at analyzer
Flux • PG 002, collimation 30' 20': 9.05·105 n/cm2s
• PG 002, collimation 30' 40': 1.83·106 n/cm2s
• PG 002, collimation fan -: 1.82·106 n/cm2s
• Ge 311, collimation 30' 20': 1.32·106 n/cm2s
• Ge 311, collimation 30' 40': 2.55·106 n/cm2s
• Ge 311, collimation fan -: 4.80·106 n/cm2s
Filter PG, upstream from α1 collimation
Polarized neutrons no
Polarizer
Instrument options
Sample environment apparatus accepts all HZB standard and special equipment
Software caress
Miscellaneous for PG 002 monochromator: λ1/2/λ = 1/400