The use of chopper spectrometers for cold-to-epithermal neutron scattering at IPNS
A multi-detector chopper spectrometer enables measurements of the scattering function S(Q,E) to be made over a wide range of momentum and energy transfer (Q,E). The application of pulsed-source chopper spectrometers for inelastic measurements at thermal and epithermal energies (50 meV < E < 1000 meV) is well known. Recently at IPNS, we have extended the energy-transfer region down to about 0.5 meV with a resolution of the order of 150 {mu}eV. It is made possible by utilizing the cold-neutron incident spectrum of the 100 K methane moderator in conjunction with a dual beryllium-body rotor system. Neutron incident energies can be changed efficiently over the 4 to 1000 meV region while maintaining an undisturbed sample environment. We describe the operation of the IPNS chopper spectrometers (HRMECS and LRMECS), the instrumental resolution and the background-suppression performance. The capability of measuring inelastic features from 0.5 to 100 meV with an energy resolution of {Delta}E/E{sub 0} = 2.5% is demonstrated by experimental results of crystal-field excitation spectra of a high-Tc superconductor ErBa{sub 2}Cu{sub 3}O{sub 7}. Preliminary data of quasielastic scattering from a room-temperature molten salt AlCl{sub 3}-EMIC are presented.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10176611
- Report Number(s):
- ANL/IPNS/CP-78912; CONF-9305177-10; ON: DE93017798
- Resource Relation:
- Conference: 12. International collaboration of advanced neutron sources meeting (ICANS),Abingdon (United Kingdom),24-28 May 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
36 MATERIALS SCIENCE
IPNS-I SYNCHROTRON
NEUTRON SPECTROSCOPY
NEUTRON SPECTROMETERS
NEUTRON CHOPPERS
PERFORMANCE
HIGH-TC SUPERCONDUCTORS
BEAM PULSERS
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665100
440103
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EXPERIMENTAL FACILITIES AND EQUIPMENT
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS
NUCLEAR SPECTROSCOPIC INSTRUMENTATION
PHYSICAL PROPERTIES