E1
Thermal Neutron 3-Axis Spectrometer
The instrument was decommissiond in 2016.
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 | 2ΘM = 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 |