LRMECS - Low Resolution Medium Energy Chopper Spectrometer
Instrument Scientist - Alexander Kolesnikov
Scientific Assistant - Lynette Jirik
| Beam Tube |
IPNS F4 |
| Initial Flight Path |
7.0m |
| Final Flight Path |
2.5m |
| Beam Size |
5cm wide x 10cm high |
| Detectors |
2.5cm x 45cm(130)
2.5cm x 22.5cm(20) |
| Choppers |
50, 160, 500meV @ 16,700 rpm |
| Scattering Angles |
-10° - 120° |
| Time Average Flux at Sample (EO = 0.5eV) |
2000n/cm2sec |
| Energy Transfer Range |
0 - 0.5eV |
| Wave-vector Range |
1 - 20 Å-1 |
| Energy Transfer Resolution |
0.06 - 0.08 EO |
| Wave-vector Resolution |
0.03 - 0.04 KO |
LRMECS is one of two IPNS chopper spectrometers utilizing cold-to-epithermal neutrons for investigating the dynamic properties of materials. It has continuous detector coverage from 3 to 118 degrees and a wide range of incident energies from 6 to 600 meV, making it an efficient way of measuring S(Q,w) over a wide range of energy and momentum transfers. It is used to investigate the properties of a large range of technologically important materials; recent subjects include the dynamics of amorphous alloys, phonon densities-of-state in ceramic oxides, hydrogen diffusion in porous media, magnetic fluctuations in strongly correlated electron systems and crystal field and spin-orbit excitations in f-electron systems.
References
- Loong, C.K. et al., Presented at the 12th ICANS Meeting, Abingdon, England, 24-28 May 1993.
- D.L. Price et al., ICANS-VI, ANL Report No. ANL-82-80 (1982) 207
- J.M. Carpenter et al., ICANS-XI, KEK Report No. 90-25 (1991) 711
- C.-K. Loong et al., Nucl. Instr. Methods, A260 (1987) 381
Useful Links
NeXus Data Format - the official home page of the neutron/x-ray data format standard
Multi-FRILLS manual - documentation for the interactive least-squares fitting package
Open Genie - documentation of the IPNS installation of open Genie
|
