Flash X-ray diffraction system for fast, single-pulse temperature and phase transition measurements

Морган, Д.; Macy, D.; Madlener, M.J.; Morgan, J. G.

doi:10.1109/ppps.2007.4651823

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…This effect is caused by the increase in the random displacement of the individual atoms from their exact geometric lattice site, which also results in an increase in the observed incoherently scattered background ( James, 1982). Single-pulse XRD bench-top laboratory measurements of this effect have been reported (Morgan, 2007), leading to the possibility that single-pulse XRD could be useful as a dynamic temperature diagnostic. Coherent scattering from atomic centers in a solid-state lattice results in diffraction lines, which are observed at angles for which the difference in path lengths is an integral number of wavelengths.…”

Section: Fy 2010 Materials Studies and Techniquesmentioning

confidence: 99%

Nevada Test Site-Directed Research and Development, FY 2009 Annual Report

Bender¹

2010

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An Historical Year This annual report of the Site-Directed Research and Development (SDRD) program represents the highly significant R&D accomplishments conducted during fiscal year 2010. This year was noteworthy historically, as the Nevada Test Site was renamed to the Nevada National Security Site (NNSS). This change not only recognizes how the site's mission has evolved, but also heralds a future of new challenges and opportunities for the NNSS. In many ways, since its inception in 2002, the SDRD program has helped shape that evolving mission. As we approach 2012, SDRD will also mark a milestone, having completed its first full decade of innovative R&D in support of the site and national security. The program continues to fund advanced science and technology development across traditional Department of Energy (DOE) nuclear security areas such as stockpile stewardship and non-proliferation while also supporting Department of Homeland Security (DHS) needs, and specialized work for government agencies like the Department of Defense (DoD) and others. The NNSS will also contribute technologies in the areas of treaty verification and monitoring, two areas of increasing importance to national security. Keyed to the NNSS's broadened scope, the SDRD program will continue to anticipate and advance R&D projects that will help the NNSS meet forthcoming challenges. NSTec principal investigator M. Manard with mini mass spectrometer, which was recently described in an invited paper in International Journal of Mass Spectroscopy FY 2010 vi NSTec principal investigators M. Wu and C. Kruschwitz have written a book chapter based on their Monte Carlo work NSTec principal investigator D. Yuan describes a nuclear forensics R&D project at the 2010 LDRD symposium

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Section: Fy 2010 Materials Studies and Techniquesmentioning

confidence: 99%

Nevada Test Site-Directed Research and Development, FY 2009 Annual Report

Bender¹

2010

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“…To extract information from X-ray diffraction intensity, it is important to take the Debye-Waller factor into account. One application of extracting information from X-ray diffraction intensity is the well known Rietveld method (Cuesta et al, 2015); another is the method of estimating the crystal temperature of a shocked crystal, proposed by Morgan et al (2007).…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulation of an anharmonic Debye–Waller factor to the T ⁴ order

Wang¹,

Huang²,

Li³

et al. 2017

Acta Cryst Sect A

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In an increasing number of cases the harmonic approximation is incommensurate with the quality of Bragg diffraction data, while results of the anharmonic Debye-Waller factor are not typically available. This paper presents a Monte Carlo computation of a Taylor expansion of an anharmonic Debye-Waller factor with respect to temperature up to the fourth order, where the lattice was a face-centred cubic lattice and the atomic interaction was described by the Lennard-Jones potential. The anharmonic Debye-Waller factor was interpreted in terms of cumulants. The results revealed three significant points. Firstly, the leading term of anharmonicity had a negative contribution to the Debye-Waller factor, which was confirmed by Green's function method. Secondly, the fourth-order cumulants indicated a non-spherical probability density function. Thirdly, up to the melting point of two different densities, the cumulants up to the fourth order were well fitted by the Taylor expansion up to T, which suggested that the Debye-Waller factor may be calculated by perturbation expansion up to the corresponding terms. In conclusion, Monte Carlo simulation is a useful approach for calculating the Debye-Waller factor.

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Flash X-ray diffraction system for fast, single-pulse temperature and phase transition measurements

Cited by 2 publications

References 3 publications

Nevada Test Site-Directed Research and Development, FY 2009 Annual Report

Nevada Test Site-Directed Research and Development, FY 2009 Annual Report

Monte Carlo simulation of an anharmonic Debye–Waller factor to the T ⁴ order

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Flash X-ray diffraction system for fast, single-pulse temperature and phase transition measurements

Cited by 2 publications

References 3 publications

Nevada Test Site-Directed Research and Development, FY 2009 Annual Report

Nevada Test Site-Directed Research and Development, FY 2009 Annual Report

Monte Carlo simulation of an anharmonic Debye–Waller factor to the T 4 order

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Monte Carlo simulation of an anharmonic Debye–Waller factor to the T ⁴ order