The new cold neutron chopper spectrometer at the Spallation Neutron Source: Design and performance

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3626935· OSTI ID:22063704

Ehlers, G; Podlesnyak, A A; Niedziela, J L; Iverson, E B ^[1]; Sokol, P E ^[2]

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1. Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)

The design and performance of the new cold neutron chopper spectrometer (CNCS) at the Spallation Neutron Source in Oak Ridge are described. CNCS is a direct-geometry inelastic time-of-flight spectrometer, designed essentially to cover the same energy and momentum transfer ranges as IN5 at ILL, LET at ISIS, DCS at NIST, TOFTOF at FRM-II, AMATERAS at J-PARC, PHAROS at LANSCE, and NEAT at HZB, at similar energy resolution. Measured values of key figures such as neutron flux at sample position and energy resolution are compared between measurements and ray tracing Monte Carlo simulations, and good agreement (better than 20% of absolute numbers) has been achieved. The instrument performs very well in the cold and thermal neutron energy ranges, and promises to become a workhorse for the neutron scattering community for quasielastic and inelastic scattering experiments.

• OSTI ID: 22063704
• Journal Information: Review of Scientific Instruments, Vol. 82, Issue 8; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
COLD NEUTRONS
ENERGY RESOLUTION
INELASTIC SCATTERING
J-PARC
MOMENTUM TRANSFER
MONTE CARLO METHOD
NEUTRON CHOPPERS
NEUTRON DIFFRACTION
NEUTRON FLUX
NEUTRON SOURCES
NEUTRON SPECTROMETERS
QUASI-ELASTIC SCATTERING
SPALLATION
THERMAL NEUTRONS
TIME-OF-FLIGHT SPECTROMETERS