The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Weston M Stacey - One of the best experts on this subject based on the ideXlab platform.
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Georgia Tech Studies of Sub-Critical Advanced Burner Reactors with a D-T Fusion Tokamak Neutron Source for the Transmutation of Spent Nuclear Fuel
Journal of Fusion Energy, 2009Co-Authors: Weston M StaceyAbstract:The possibility that a tokamak D-T fusion Neutron Source, based on ITER physics and technology, could be used to drive sub-critical, fast-spectrum nuclear reactors fueled with the transuranics (TRU) in spent nuclear fuel discharged from conventional nuclear reactors has been investigated at Georgia Tech in a series of studies which are summarized in this paper. It is found that sub-critical operation of such fast transmutation reactors is advantageous in allowing longer fuel residence time, hence greater TRU burnup between fuel reprocessing stages, and in allowing higher TRU loading without compromising safety, relative to what could be achieved in a similar critical transmutation reactor. The required plasma and fusion technology operating parameter range of the fusion Neutron Source is generally within the anticipated operational range of ITER. The implications of these results for fusion development policy, if they hold up under more extensive and detailed analysis, is that a D-T fusion tokamak Neutron Source for a sub-critical transmutation reactor, built on the basis of the ITER operating experience, could possibly be a logical next step after ITER on the path to fusion electrical power reactors. At the same time, such an application would allow fusion to contribute to meeting the nation’s energy needs at an earlier stage by helping to close the fission reactor nuclear fuel cycle.
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tokamak fusion Neutron Source for a fast transmutation reactor
Fusion Science and Technology, 2007Co-Authors: J P Floyd, S M Jones, M Kato, J C Schultz, B H Shrader, J B Weathers, Weston M Stacey, Z W Friis, R W JohnsonAbstract:A conceptual design has been developed for a tokamak D-T fusion Neutron Source, based on ITER physics and technology, for a sub-critical fast reactor that would transmute the fissionable transuranic isotopes in spent nuclear fuel.
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a subcritical gas cooled fast transmutation reactor with a fusion Neutron Source
Nuclear Technology, 2005Co-Authors: Weston M Stacey, Z W Friis, V L Beavers, W A Casino, J R Cheatham, R D Green, W R Hamilton, K W Haufler, J D Hutchinson, W J LackeyAbstract:A design is presented for a subcritical, He-cooled fast reactor, driven by a tokamak D-T fusion Neutron Source, for the transmutation of spent nuclear fuel (SNF). The reactor is fueled with coated transuranic (TRU) particles and is intended for the deep-burn (>90%) transmutation of the TRUs in SNF without reprocessing of the coated fuel particles. The reactor design is based on the materials, fuel, and separations technologies under near-term development in the U.S. Department of Energy (DOE) Nuclear Energy Program and on the plasma physics and fusion technologies under near-term development in the DOE Fusion Energy Sciences Program, with the objective of intermediate-term ({approx}2040) deployment. The physical and performance characteristics and research and development requirements of such a reactor are described.
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capabilities of a dt tokamak fusion Neutron Source for driving a spent nuclear fuel transmutation reactor
Nuclear Fusion, 2001Co-Authors: Weston M StaceyAbstract:The capabilities of a DT fusion Neutron Source for driving a spent nuclear fuel transmutation reactor are characterized by identifying limits on transmutation rates that would be imposed by tokamak physics and engineering limitations on fusion Neutron Source performance. The need for spent nuclear fuel transmutation and the need for a Neutron Source to drive subcritical fission transmutation reactors are reviewed. The likely parameter ranges for tokamak Neutron Sources that could produce an interesting transmutation rate of 100s to 1000s of kg/FPY (where FPY stands for full power year) are identified (Pfus ≈ 10-100 MW, βN ≈ 2-3, Qp ≈ 2-5, R ≈ 3-5 m, I ≈ 6-10 MA). The electrical and thermal power characteristics of transmutation reactors driven by fusion and accelerator spallation Neutron Sources are compared. The status of fusion development vis-a-vis a Neutron Source is reviewed.
M Fujita - One of the best experts on this subject based on the ideXlab platform.
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Neutron brillouin scattering with pulsed spallation Neutron Source spin wave excitations from ferromagnetic powder samples
Journal of the Physical Society of Japan, 2013Co-Authors: Shinichi Itoh, Y Endoh, Tetsuya Yokoo, Daichi Kawana, Y Kaneko, Yoshinori Tokura, M FujitaAbstract:The Neutron Brillouin scattering (NBS) method, which was developed using advanced Neutron Sources, was extended to an intense pulsed spallation Neutron Source. The feasibility of this method was demonstrated by observing ferromagnetic spin waves in La0.8Sr0.2MnO3 and SrRuO3 powders. Gapless spin-wave excitations were observed in La0.8Sr0.2MnO3, which were continuously extrapolated to the lower scattering vector \(Q\) from previous results using single crystals. The novel result is a well-defined quadratic \(Q\) dependence in the spin-wave dispersion curve with a large energy gap in SrRuO3.
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Neutron brillouin scattering with pulsed spallation Neutron Source spin wave excitations from ferromagnetic powder samples
arXiv: Strongly Correlated Electrons, 2012Co-Authors: Shinichi Itoh, Y Endoh, Tetsuya Yokoo, Daichi Kawana, Y Kaneko, Yoshinori Tokura, M FujitaAbstract:Neutron Brillouin scattering (NBS) method was developed using a pulsed spallation Neutron Source, and the feasibility of NBS was demonstrated by observing ferromagnetic spin waves in La$_{0.8}$Sr$_{0.2}$MnO$_3$ and SrRuO$_3$ powders. Gapless spin-wave excitations were observed in La$_{0.8}$Sr$_{0.2}$MnO$_3$, which were continuously extended to the lower scattering vector $Q$ from previous results using single crystals. The novel result is a well-defined quadratic $Q$ dependence in the spin-wave dispersion curve with a large energy gap in SrRuO$_3$ indicating robust spin-orbit coupling.
S P Platt - One of the best experts on this subject based on the ideXlab platform.
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facility for fast Neutron irradiation tests of electronics at the isis spallation Neutron Source
Applied Physics Letters, 2008Co-Authors: C Andreani, A Pietropaolo, A Salsano, G Gorini, M Tardocchi, A Paccagnella, S Gerardin, C D Frost, S Ansell, S P PlattAbstract:The VESUVIO beam line at the ISIS spallation Neutron Source was set up for Neutron irradiation tests in the Neutron energy range above 10MeV. The Neutron flux and energy spectrum were shown, in benchmark activation measurements, to provide a Neutron spectrum similar to the ambient one at sea level, but with an enhancement in intensity of a factor of 107. Such conditions are suitable for accelerated testing of electronic components, as was demonstrated here by measurements of soft error rates in recent technology field programable gate arrays.
Chick C Wilson - One of the best experts on this subject based on the ideXlab platform.
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sxd the single crystal diffractometer at the isis spallation Neutron Source
Journal of Applied Crystallography, 2006Co-Authors: David A Keen, Matthias J Gutmann, Chick C WilsonAbstract:SXD, the single-crystal diffractometer at the ISIS spallation Neutron Source, uses an array of two-dimensional position-sensitive detectors and the Neutron time-of-flight technique to measure diffraction data throughout very large volumes of reciprocal space for each fixed orientation of a single-crystal sample. This paper describes SXD in detail, following major improvements to the instrument. Particular emphasis is placed on the range of science possible, using recent results as examples, and the opportunities for future experiments.
C Andreani - One of the best experts on this subject based on the ideXlab platform.
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compositional studies of functional orthodontic archwires using prompt gamma activation analysis at a pulsed Neutron Source
Journal of Analytical Atomic Spectrometry, 2017Co-Authors: Kun V Tian, G Festa, L Szentmiklosi, Boglarka Maroti, Laura Arcidiacono, G Lagana, C Andreani, Silvia Licoccia, R Senesi, Paola CozzaAbstract:Prompt-gamma activation analysis (PGAA) measurements were carried out at the ISIS Spallation Neutron Source on two sets of functional commercial stainless steel orthodontic archwires, aiming at providing insights into the elemental and isotopic composition differences of two nominally equivalent archwires. The results were compared to those obtained from parallel cold Neutron PGAA measurements on the same samples at the Budapest Neutron Centre in order to test the current status of PGAA at a pulsed Neutron Source and eventually to inform improvement in set-up and acquisition methods. In addition, time-resolved PGAA (T-PGAA) that combines PGAA and Neutron time-of-flight methods was applied to the present set of samples, allowing the measurement of the Neutron energy dependence of the PGAA spectra. The advantages of this technique were demonstrated to be that through incident Neutron energy selection, spanning 0.07–67.94 eV, enhancement or decrease of specific gamma lines associated with isotopes of interest could be achieved. These were shown to reduce peak interference and to increase the signal-to-background ratio for certain species in order to facilitate accurate elemental identification. Suggestions for potential performance improvement for this evolving technique are proposed.
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facility for fast Neutron irradiation tests of electronics at the isis spallation Neutron Source
Applied Physics Letters, 2008Co-Authors: C Andreani, A Pietropaolo, A Salsano, G Gorini, M Tardocchi, A Paccagnella, S Gerardin, C D Frost, S Ansell, S P PlattAbstract:The VESUVIO beam line at the ISIS spallation Neutron Source was set up for Neutron irradiation tests in the Neutron energy range above 10MeV. The Neutron flux and energy spectrum were shown, in benchmark activation measurements, to provide a Neutron spectrum similar to the ambient one at sea level, but with an enhancement in intensity of a factor of 107. Such conditions are suitable for accelerated testing of electronic components, as was demonstrated here by measurements of soft error rates in recent technology field programable gate arrays.
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electron volt spectroscopy at a pulsed Neutron Source using a resonance detector technique
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2002Co-Authors: C Andreani, R Senesi, A Pietropaolo, G Gorini, M Tardocchi, A Bracco, N J Rhodes, E M SchooneveldAbstract:Abstract The effectiveness of the Neutron resonance detector spectrometer for deep inelastic Neutron scattering measurements has been assessed by measuring the Pb scattering on the eVS spectrometer at ISIS pulsed Neutron Source and natural U foils as (n,γ) resonance converters. A conventional NaI scintillator with massive shielding has been used as γ detector. A Neutron energy window up to 90 eV, including four distinct resonance peaks, has been assessed. A net decrease of the intrinsic width of the 6.6 eV resonance peak has also been demonstrated employing the double difference spectrum technique, with two uranium foils of different thickness.