scholarly journals Cooperative effort between Consorcio European Spallation Source--Bilbao and Oak Ridge National Laboratory spallation neutron source for manufacturing and testing of the JEMA-designed modulator system

2017 ◽  
Author(s):  
David E. Anderson
Keyword(s):  
Neutron Source ◽  
National Laboratory ◽  
Spallation Neutron Source ◽  
Cooperative Effort ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
Spallation Source

scholarly journals High-resolution neutron time-of-flight measurements for light water at the Spallation Neutron Source (SNS), Oak Ridge National Laboratory

2020 ◽  
Vol 239 ◽  
pp. 14005
Author(s):  
Luiz Leal ◽  
Vaibhav Jaiswal ◽  
Alexander I. Kolesnikov
Keyword(s):  
Experimental Data ◽  
Neutron Source ◽  
National Laboratory ◽  
Operating Conditions ◽  
Spallation Neutron Source ◽  
Light Water ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory ◽  
Thermal Scattering ◽  
Reactor Operating

Series of light water inelastic neutron scattering experiments have been made at the Oak Ridge National Laboratory (ORNL), Spallation Neutron Source (SNS) covering temperatures ranging from 295 K to 600 K and pressures of 1 bar and 150 bar. The temperatures and pressures ranges correspond to that of pressurized light water reactors. The inelastic scattering measurements will help the development of light water thermal scattering kernels, also known as S (α,β) thermal scattering law (TSL), in a consistent fashion given the amount and the quality of the measured data. Light water thermal scattering evaluations available in existing nuclear data libraries have certain limitations and pitfalls. This paper introduces the state of the art of the light water thermal scattering cross-section data not only for room temperature but as well as for reactor operating temperatures, i.e. 550 - 600 K. During the past few years there has been a renewed interest in re-investigating the existing TSL models and utilize the recent experimental data or perform molecular dynamics simulations. It should be pointed out that no single TSL evaluation is based entirely on experimental data and one has to rely on TSL models or a combination of both. New TOF measurement of light water at the SNS, with a detailed description of the experimental setup, measurement conditions, and the associated foreseen results is presented in this paper. The analysis of the experimental data would help in validating the existing approach based on old experimental data or based on molecular dynamic simulations using classical water models, knowledge of which is very important to generate TSL libraries at reactor operating conditions.

scholarly journals The Macromolecular Neutron Diffractometer MaNDi at the Spallation Neutron Source

2015 ◽  
Vol 48 (4) ◽  
pp. 1302-1306 ◽  
Author(s):  
Leighton Coates ◽  
Matthew J. Cuneo ◽  
Matthew J. Frost ◽  
Junhong He ◽  
Kevin L. Weiss ◽  
...  
Keyword(s):  
Data Collection ◽  
Single Crystals ◽  
Neutron Source ◽  
Diffraction Data ◽  
National Laboratory ◽  
Spallation Neutron Source ◽  
Oak Ridge ◽  
Neutron Diffractometer ◽  
Macromolecular Systems ◽  
Neutron Time

The Macromolecular Neutron Diffractometer (MaNDi) is located on beamline 11B of the Spallation Neutron Source at Oak Ridge National Laboratory. The instrument is a neutron time-of-flight wavelength-resolved Laue diffractometer optimized to collect diffraction data from single crystals. The instrument has been designed to provide flexibility in several instrumental parameters, such as beam divergence and wavelength bandwidth, to allow data collection from a range of macromolecular systems.

scholarly journals Study on severe accident fuel dispersion behavior in the Advanced Neutron Source reactor at Oak Ridge National Laboratory

1995 ◽  
Author(s):  
S.H. Kim ◽  
R.P. Taleyarkhan ◽  
S. Navarro-Valenti ◽  
V. Georgevich
Keyword(s):  
Neutron Source ◽  
National Laboratory ◽  
Severe Accident ◽  
Oak Ridge ◽  
Dispersion Behavior ◽  
Oak Ridge National Laboratory

The macromolecular neutron diffractometer (MaNDi) at the Spallation Neutron Source, Oak Ridge: enhanced optics design, high-resolution neutron detectors and simulated diffraction

2010 ◽  
Vol 43 (3) ◽  
pp. 570-577 ◽  
Author(s):  
L. Coates ◽  
A. D. Stoica ◽  
C. Hoffmann ◽  
J. Richards ◽  
R. Cooper
Keyword(s):  
High Resolution ◽  
Neutron Source ◽  
National Laboratory ◽  
High Energy ◽  
Neutron Guide ◽  
Spallation Neutron Source ◽  
Neutron Detectors ◽  
Spectral Window ◽  
Oak Ridge ◽  
Neutron Diffractometer

The macromolecular neutron diffractometer MaNDi is currently under construction at the first target station of the Spallation Neutron Source at Oak Ridge National Laboratory. This instrument will collect neutron diffraction data from small single crystals (0.1–1 mm3) with lattice constants between 100 and 300 Å, as well as data from less well ordered systems such as fibers. A focusing neutron guide has been designed to filter the high-energy neutron component of the spectrum and to provide a narrow beam with a wide spectral window and angular divergence almost insensitive to neutron wavelength. The system includes a final interchangeable section of neutron guide and two slits, which enable tuning of the horizontal and vertical beam divergence between 0.12 and 0.80° (full width at half-maximum) at the sample position. This allows the trading of intensity for resolution, depending on the scientific requirements. Efforts to enhance and develop suitable high-resolution neutron detectors at an affordable price are also discussed. Finally, the parameters of the neutron guide and detectors were used to simulate diffraction from a large unit cell.

scholarly journals Phase 1 environmental report for the Advanced Neutron Source at Oak Ridge National Laboratory

1992 ◽  
Author(s):  
T.J. Blasing ◽  
R.A. Brown ◽  
G.F. Cada ◽  
C. Easterly ◽  
D.L. Feldman ◽  
...  
Keyword(s):  
Neutron Source ◽  
Phase 1 ◽  
National Laboratory ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

scholarly journals Light yield of cold undoped CsI crystal down to 13 keV and the application of such crystals in neutrino detection

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Keyu Ding ◽  
Dmitry Chernyak ◽  
Jing Liu
Keyword(s):  
Energy Range ◽  
Neutron Source ◽  
National Laboratory ◽  
Light Yield ◽  
Radioactive Source ◽  
Experimental Result ◽  
Spallation Neutron Source ◽  
Oak Ridge ◽  
Neutrino Detection ◽  
Electron Equivalent

AbstractThe light yield of an undoped CsI crystal at about 77 Kelvin was measured to be $$33.5 \, \pm \, 0.7$$ 33.5 ± 0.7  photo-electrons (PE) per keV electron-equivalent (keVee) in the energy range of [13, 60] keVee using X and $$\gamma $$ γ -rays from an $$^{241}$$ 241 Am radioactive source. Based on this experimental result, the performance of 10 kg cryogenic inorganic scintillating crystals coupled to SiPM arrays to probe non-standard neutrino interactions through the detection of coherent elastic neutrino-nucleus scatterings at the spallation neutron source, Oak Ridge National Laboratory, was examined in detail.

scholarly journals Atomic pair distribution function analysis from the ARCS chopper spectrometer at the Spallation Neutron Source

2009 ◽  
Vol 42 (4) ◽  
pp. 724-725 ◽  
Author(s):  
E. S. Božin ◽  
P. Juhás ◽  
W. Zhou ◽  
M. B. Stone ◽  
D. L. Abernathy ◽  
...  
Keyword(s):  
Neutron Source ◽  
Powder Diffraction ◽  
Function Analysis ◽  
National Laboratory ◽  
Distribution Functions ◽  
Spallation Neutron Source ◽  
Los Alamos National Laboratory ◽  
Oak Ridge ◽  
Atomic Pair Distribution Function ◽  
Atomic Pair

Neutron powder-diffraction-based atomic pair distribution functions (PDFs) are reported from the new wide-angular-range chopper spectrometer ARCS at the Spallation Neutron Source at Oak Ridge National Laboratory. The spectrometer was run in white-beam mode with no Fermi chopper. The PDF patterns of Ni and Al2O3were refined using the PDFfit method and the results compared with data collected at the NPDF diffractometer at Los Alamos National Laboratory. The resulting fits are of high quality, demonstrating that quantitatively reliable powder diffraction data can be obtained from ARCS when operated in this configuration.

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