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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Order within disorder: The atomic structure of ion-beam sputtered amorphous tantala (a-Ta{sub 2}O{sub 5})
Amorphous tantala (a-Ta{sub 2}O{sub 5}) is a technologically important material often used in high-performance coatings. Understanding this material at the atomic level provides a way to further improve performance. This work details extended X-ray absorption fine structure measurements of a-Ta{sub 2}O{sub 5} coatings, where high-quality experimental data and theoretical fits have allowed a detailed interpretation of the nearest-neighbor distributions. It was found that the tantalum atom is surrounded by four shells of atoms in sequence; oxygen, tantalum, oxygen, and tantalum. A discussion is also included on how these models can be interpreted within the context of published crystalline Ta{sub 2}O{sub 5} and other a-T{sub 2}O{sub 5} studies.
Evidence for high-energy and low-emittance electron beams using ionization injection of charge in a plasma wakefield accelerator
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Experimental characterization of X-ray transverse coherence in the presence of beam transport optics
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Limitation on the accelerating gradient of a wakefield excited by an ultrarelativistic electron beam in rubidium plasma
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Heavy ion beam acceleration in the first three cryomodules at the Facility for Rare Isotope Beams at Michigan State University
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Beam commissioning in the first superconducting segment of the Facility for Rare Isotope Beams
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Positron beam extraction from an electron-beam-driven plasma wakefield accelerator
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Generating high quality ultrarelativistic electron beams using an evolving electron beam driver
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Cluster-transfer reactions with radioactive beams: A spectroscopic tool for neutron-rich nuclei
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Capture cross sections for the synthesis of new heavy nuclei using radioactive beams
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