Production of ultra-cold neutrons using Doppler-shifted Bragg scattering and an intense pulsed neutron spallation source

1979 ◽  
Author(s):  
T. W. Dombeck ◽  
J. W. Lynn
Keyword(s):  
Bragg Scattering ◽  
Cold Neutrons ◽  
Neutron Spallation Source ◽  
Spallation Source ◽  
Pulsed Neutron

Production of ultra-cold neutrons using Doppler-shifted Bragg scattering and an intense pulsed neutron spallation source

1979 ◽  
Vol 165 (2) ◽  
pp. 139-155 ◽  
Author(s):  
T.W. Dombeck ◽  
J.W. Lynn ◽  
S.A. Werner ◽  
T. Brun ◽  
J. Carpenter ◽  
...  
Keyword(s):  
Bragg Scattering ◽  
Cold Neutrons ◽  
Neutron Spallation Source ◽  
Spallation Source ◽  
Pulsed Neutron

scholarly journals 4D Bragg Edge Tomography of Directional Ice Templated Graphite Electrodes

2020 ◽  
Vol 6 (12) ◽  
pp. 136
Author(s):  
Ralf F. Ziesche ◽  
Anton S. Tremsin ◽  
Chun Huang ◽  
Chun Tan ◽  
Patrick S. Grant ◽  
...  
Keyword(s):  
Li Ion Battery ◽  
Graphite Electrodes ◽  
Neutron Spallation Source ◽  
Spallation Source ◽  
Li Ion ◽  
Tomography Method ◽  
First Time ◽  
Pulsed Neutron ◽  
Tomography Data ◽  
Insight Into

Bragg edge tomography was carried out on novel, ultra-thick, directional ice templated graphite electrodes for Li-ion battery cells to visualise the distribution of graphite and stable lithiation phases, namely LiC12 and LiC6. The four-dimensional Bragg edge, wavelength-resolved neutron tomography technique allowed the investigation of the crystallographic lithiation states and comparison with the electrode state of charge. The tomographic imaging technique provided insight into the crystallographic changes during de-/lithiation over the electrode thickness by mapping the attenuation curves and Bragg edge parameters with a spatial resolution of approximately 300 µm. This feasibility study was performed on the IMAT beamline at the ISIS pulsed neutron spallation source, UK, and was the first time the 4D Bragg edge tomography method was applied to Li-ion battery electrodes. The utility of the technique was further enhanced by correlation with corresponding X-ray tomography data obtained at the Diamond Light Source, UK.

scholarly journals Short-Pulse Laser-Driven Moderated Neutron Source

2020 ◽  
Vol 231 ◽  
pp. 01008
Author(s):  
Sven C. Vogel ◽  
Juan C. Fernandez ◽  
D. Cort Gautier ◽  
Nikodem Mitura ◽  
Markus Roth ◽  
...  
Keyword(s):  
Short Pulse ◽  
Neutron Production ◽  
Particle Accelerators ◽  
Continue Development ◽  
Neutron Sources ◽  
Short Pulse Laser ◽  
Neutron Spallation Source ◽  
Spallation Source ◽  
Laser Sources ◽  
Pulsed Neutron

Neutron production with laser-driven neutron sources was demonstrated. We outline the basics of laser-driven neutron sources, highlight some fundamental advantages, and quantitatively compare the neutron production at the TRIDENT laser sources with the well-established LANSCE pulsed neutron spallation source. Ongoing efforts by our team to continue development of these sources, in particular the LANSCE-ina-box instrument, are described. The promise of ultra-intense lasers as drivers for brilliant, compact, and highly efficient particle accelerators portends driving next-generation neutron sources, potentially replacing in some cases much larger conventional accelerators.

Mechanical Spectroscopy Investigation of Liquid Pb-Bi Alloys

2012 ◽  
Vol 184 ◽  
pp. 434-439 ◽  
Author(s):  
Roberto Montanari ◽  
Alessandra Varone
Keyword(s):  
Distribution Functions ◽  
X Ray Diffraction ◽  
Mechanical Spectroscopy ◽  
X Ray ◽  
Neutron Spallation Source ◽  
Driven System ◽  
Spallation Source ◽  
Accelerator Driven System ◽  
The Mean ◽  
Diffraction Patterns

Liquid Pb–Bi eutectic alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system. The alloy has been characterized in liquid state from melting (125 °C) to 650 °C by mechanical spectroscopy. Experiments have been carried out using hollow reeds of austenitic stainless steel filled with the Pb-Bi alloy and sealed at the extremities. From 350 °C to 520 °C modulus shows a remarkable drop accompanied by a broad internal friction maximum. In the same temperature range radial distribution functions, determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The anelastic phenomena have been attributed to a structural re-arrangement of liquid metal. For comparison, other alloys of the Pb-Bi system with hypo-eutectic composition have been investigated.

scholarly journals Austria wants to build a neutron spallation source. The Austron Proposal

1999 ◽  
Vol 30 (4) ◽  
pp. 100-100
Author(s):  
Philip Bryant ◽  
Albert Furrer ◽  
Erich Griesmayer ◽  
Erwin Jericha ◽  
Helmut Rauch ◽  
...  
Keyword(s):  
Neutron Spallation Source ◽  
Spallation Source

Structural Changes of Liquid Pb-Bi Eutectic Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 878-883 ◽  
Author(s):  
Paolo Deodati ◽  
Franco Gauzzi ◽  
Roberto Montanari ◽  
Alessandra Varone
Keyword(s):  
Dynamic Modulus ◽  
Structural Changes ◽  
Distribution Functions ◽  
X Ray Diffraction ◽  
Mechanical Spectroscopy ◽  
Neutron Spallation Source ◽  
Driven System ◽  
Spallation Source ◽  
Accelerator Driven System ◽  
Diffraction Patterns

Liquid Pb–Bi eutectic (LBE) alloy has been selected as coolant and neutron spallation source for the development of MYRRHA, an accelerator driven system (ADS). The alloy has been characterized in liquid state from melting (125 °C) to 750 °C by mechanical spectroscopy, i.e. internal friction (IF) and dynamic modulus measurements. The experiments have been carried out using hollow reeds of austenitic stainless steel filled with Pb-Bi alloy and sealed at the extremities. Dynamic modulus showed a remarkable drop in the range 350-520 °C. In the same temperature range radial distribution functions (RDFs), determined from X-ray diffraction patterns, evidenced variations of the mean distance between the 1st nearest neighbour atoms. The phenomenon has been explained as a structural re-arrangement of atoms in the liquid metal.

Elemental Clustering and Structure of Liquid LBE

2014 ◽  
Vol 922 ◽  
pp. 785-790
Author(s):  
Santosh Balijepalli ◽  
Saulius Kaciulis ◽  
Matteo Amati ◽  
Roberto Montanari ◽  
Alessandra Varone
Keyword(s):  
Cluster Size ◽  
X Ray Diffraction ◽  
Progressive Change ◽  
Driven Systems ◽  
X Ray ◽  
Nearest Neighbours ◽  
Neutron Spallation Source ◽  
Different Temperatures ◽  
Spallation Source ◽  
Accelerator Driven Systems

Liquid Pb–Bi eutectic (LBE) alloy is of great interest as coolant and neutron spallation source for the accelerator driven systems (ADS). Scanning Photoemission Microscopy (SPEM) at the ELETTRA synchrotron radiation facility of Trieste was carried out on samples quenched from melt at different temperatures. SPEM analyses show that the two components (Pb and Bi) are not homogeneously distributed in the range of temperature from melting up to 518 °C, in particular they form clusters enriched in Pb and Bi. The cluster size decreases as temperature increases hence diffusion occurs between clusters and matrix leading to the progressive disgregation of clusters that is almost completed at 518 °C. Such micro-chemical evolution is accompanied by a structural change of the liquid evidenced by the results of High-temperature X-ray Diffraction (HT-XRD). In particular, radial distribution function (RDF) curves show a progressive change of the ratio between the shell radii of 1st and 2nd nearest neighbours.

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