The Bio-SANS Small-Angle Neutron Scattering Instrument at Oak Ridge National Laboratory

Neutron News ◽  
2008 ◽  
Vol 19 (2) ◽  
pp. 22-23 ◽  
Author(s):  
William T. Heller ◽  
Gary W. Lynn ◽  
Volker S. Urban ◽  
Kevin Weiss ◽  
Dean A.A. Myles
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
National Laboratory ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

scholarly journals The suite of small-angle neutron scattering instruments at Oak Ridge National Laboratory

2018 ◽  
Vol 51 (2) ◽  
pp. 242-248 ◽  
Author(s):  
William T. Heller ◽  
Matthew Cuneo ◽  
Lisa Debeer-Schmitt ◽  
Changwoo Do ◽  
Lilin He ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Large Scale ◽  
National Laboratory ◽  
High Flux ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Oak Ridge National Laboratory ◽  
Scale Structures

Oak Ridge National Laboratory is home to the High Flux Isotope Reactor (HFIR), a high-flux research reactor, and the Spallation Neutron Source (SNS), the world's most intense source of pulsed neutron beams. The unique co-localization of these two sources provided an opportunity to develop a suite of complementary small-angle neutron scattering instruments for studies of large-scale structures: the GP-SANS and Bio-SANS instruments at the HFIR and the EQ-SANS and TOF-USANS instruments at the SNS. This article provides an overview of the capabilities of the suite of instruments, with specific emphasis on how they complement each other. A description of the plans for future developments including greater integration of the suite into a single point of entry for neutron scattering studies of large-scale structures is also provided.

The 40 m general purpose small-angle neutron scattering instrument at Oak Ridge National Laboratory

2012 ◽  
Vol 45 (5) ◽  
pp. 990-998 ◽  
Author(s):  
George D. Wignall ◽  
Kenneth C. Littrell ◽  
William T. Heller ◽  
Yuri B. Melnichenko ◽  
Kathy M. Bailey ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
National Laboratory ◽  
Scattering Data ◽  
Large Area ◽  
High Count ◽  
Incident Wavelength ◽  
Oak Ridge ◽  
Oak Ridge National Laboratory

A series of upgrades have been undertaken at the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory, including the installation of a supercritical hydrogen moderator (T≃ 20 K), which has boosted the flux of long-wavelength neutrons by over two orders of magnitude. In order to take advantage of the new capabilities, a 40 m-long small-angle neutron scattering (SANS) instrument has been constructed, which utilizes a mechanical velocity selector, pinhole collimation and a high-count-rate (>105 Hz) large-area (1 m2) two-dimensional position-sensitive detector. The incident wavelength (λ), resolution (Δλ/λ), incident collimation and sample-to-detector distance are independently variable under computer control. The detector can be moved up to 45 cm off-axis to increase the overallQrange [<0.001 <Q= (4π/λ)sinθ < 1 Å−1, where 2θ is the angle of scatter]. The design and characteristics of this instrument are described, along with examples of scattering data to illustrate the performance.

First data acquired on the extendedQ-range small-angle neutron scattering (EQ-SANS) diffractometer at the Spallation Neutron Source

2011 ◽  
Vol 44 (5) ◽  
pp. 1120-1122 ◽  
Author(s):  
Dazhi Liu ◽  
Kunlun Hong ◽  
Carrie Y. Gao ◽  
Yuri Melnichenko ◽  
Ken Littrell ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Neutron Source ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
National Laboratory ◽  
Model Fitting ◽  
Scattering Data ◽  
Radius Of Gyration ◽  
Spallation Neutron Source ◽  
Oak Ridge

Initial experimental results are reported from the extendedQ-range small-angle neutron scattering (EQ-SANS) diffractometer at the Spallation Neutron Source at Oak Ridge National Laboratory (ORNL). A generation-8 polyamidoamine dendrimer was measured and the conformation parameters (radius of gyration, thickness of the soft shelletc.) extracted by model fitting to the scattering data. The results are compared with data collected at the general-purpose small-angle neutron scattering (GP-SANS) beamline at the High-Flux Isotopic Reactor at ORNL and show that EQ-SANS is ready for scientific studies for the small-angle neutron scattering community.

Experimental Evidence of Super Densification of Adsorbed Hydrogen by in-situ Small Angle Neutron Scattering (SANS)

2011 ◽  
Vol 1334 ◽  
Author(s):  
Dipendu Saha ◽  
Lilin He ◽  
Cristian I. Contescu ◽  
Nidia C. Gallego ◽  
Yuri B. Melnichenko
Keyword(s):  
Neutron Scattering ◽  
Pore Size ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Hydrogen Gas ◽  
Necessary Condition ◽  
Adsorbed Hydrogen ◽  
Oak Ridge ◽  
Hydrogen Molecules

ABSTRACTEntrapping hydrogen molecules within the nanopores of solid adsorbents serves as a unique alternative for on-board storing of hydrogen for transportation purposes. The key advantage of the physisorption process for hydrogen storage is the higher density values achieved with the adsorbed gas, compared to that of the compressed phase, translating into higher storage capacities at lower pressures. The necessary condition for effective adsorption is the presence of narrow micropores of < 2 nm in width which provide the most suitable environment of hydrogen adsorption. Despite numerous theoretical calculations or indirect experimental estimations, there has not been a direct experimental measurement of the density of adsorbed hydrogen as a function of pressure and/or pore size. In the present study, we report on the use of in-situ small angle neutron scattering (SANS) to study the phase behavior of hydrogen confined in narrow micropores. We provide for the first time direct experimental measurements of the effect of pore size and pressure on hydrogen adsorbed on a polyfurfuryl alcohol-derived activated carbon (PFAC), at room temperature and pressures up to 207 bar. SANS studies were carried out at the General-Purpose Small-Angle Neutron Scattering spectrometer of the High Flux Isotope Reactor at Oak Ridge National Laboratory. The measurements covered the Q-range from 0.01 to 0.8 Å-1, covering the pores in the range of 9 to 34 Å of the PFAC material. Initial results suggest that the density of adsorbed hydrogen is higher than the density of bulk hydrogen gas and increases with decreasing pore size.

General Purpose Small-Angle Neutron Scattering Instrument on HFIR Oak Ridge

Neutron News ◽  
2008 ◽  
Vol 19 (3) ◽  
pp. 20-21 ◽  
Author(s):  
K.C. Littrell ◽  
K.M. Atchley ◽  
G. Cheng ◽  
Y.B. Melnichenko ◽  
G.D. Wignall
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
General Purpose ◽  
Oak Ridge

scholarly journals New search for mirror neutron regeneration

2019 ◽  
Vol 219 ◽  
pp. 07002
Author(s):  
L.J. Broussard ◽  
K.M. Bailey ◽  
W.B. Bailey ◽  
J.L. Barrow ◽  
K. Berry ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
National Laboratory ◽  
General Purpose ◽  
High Flux ◽  
Neutron Lifetime ◽  
Neutron State ◽  
Oak Ridge ◽  
Cold Neutrons

The possibility of relatively fast neutron oscillations into a mirror neutron state is not excluded experimentally when a mirror magnetic field is considered. Direct searches for the disappearance of neutrons into mirror neutrons in a controlled magnetic field have previously been performed using ultracold neutrons, with some anomalous results reported. We describe a technique using cold neutrons to perform a disappearance and regeneration search, which would allow us to unambiguously identify a possible oscillation signal. An experiment using the existing General Purpose-Small Angle Neutron Scattering instrument at the High Flux Isotope Reactor at Oak Ridge National Laboratory will have the sensitivity to fully explore the parameter space of prior ultracold neutron searches and confirm or refute previous claims of observation. This instrument can also conclusively test the validity of recently suggested oscillation-based explanations for the neutron lifetime anomaly.

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