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

G. Ehlers; A. A. Podlesnyak; J. L. Niedziela; E. B. Iverson; P. E. Sokol

doi:10.1063/1.3626935

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

G. Ehlers, A. A. Podlesnyak, J. L. Niedziela, E. B. Iverson, P. E. Sokol

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Abstract

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.

Original language	English
Article number	085108
Journal	Review of Scientific Instruments
Volume	82
Issue number	8
DOIs	https://doi.org/10.1063/1.3626935
State	Published - Aug 2011

Funding

The following people have made significant contributions to the planning, design, or construction of CNCS: M. C. Aronson, T. L. Arthur, W. B. Bailey, A. Barzilov, D. A. Bunch, S. M. Chae, S. H. Chen, R. W. Connatser, J. Cook, R. G. Cooper, R. K. Crawford, R. A. Dean, R. Dimeo, W. R. Fox, F. X. Gallmeier, M. H. Gevers, G. E. Granroth, G. C. Greene, W. M. McHargue, L. L. Jacobs, G. H. Jones, W. S. Keener, J. Morgan, D. Narehood, N. Page, A. A. Parizzi, J. Pearce, D. B. Prieto, F. S. Proffitt, R. A. Riedel, S. M. Rogers, C. A. Schnell, J. L. Stockton, H. Strauss, H. Taub, B. M. Thibadeau, D. M. Williams, F. R. Williams, and P. A. Wright. Construction of CNCS was funded by (U.S.) Department of Energy (DOE) grant (Grant No. DE-FG02-01ER45912). Research at Oak Ridge National Laboratory's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE.

Funders	Funder number
Scientific User Facilities Division
U.S. Department of Energy	DE-FG02-01ER45912
Corporation for National and Community Service
Basic Energy Sciences
Oak Ridge National Laboratory

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10.1063/1.3626935

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

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