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Development Of A Low Energy Positron Beam
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Book Synopsis Development of a Low Energy Positron Beam by : Sujata Vemuri
Download or read book Development of a Low Energy Positron Beam written by Sujata Vemuri and published by . This book was released on 1993 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Low Energy Positron Beams and Their Application to the Study of the Surface Region in Metals by :
Download or read book Development of Low Energy Positron Beams and Their Application to the Study of the Surface Region in Metals written by and published by . This book was released on 1988 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-Energy Positron-Matter Interactions Using Trap-Based Beams by : S. J. Gilbert
Download or read book Low-Energy Positron-Matter Interactions Using Trap-Based Beams written by S. J. Gilbert and published by . This book was released on 2002 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an overview of nonneutral plasma techniques developed to study the interaction of low-energy positrons with atoms and molecules. Both scattering and positron annihilation experiments are described. The scattering experiments provide the first state-resolved cross sections for both vibrational excitation of molecules and electronic excitation of atoms and molecules by positron impact. The annihilation experiments provide the first energy-resolved measurements of positron annihilation. Extensions of these techniques are briefly discussed, including work to create a new generation of positron beams with multi-electron volt energy resolution and the development of methods to study atomic clusters and dust grains.
Book Synopsis A New Ultra-cold Positron Beam and Applications to Low-energy Positron Scattering and Electron-positron Plasmas by : Steven Jay Gilbert
Download or read book A New Ultra-cold Positron Beam and Applications to Low-energy Positron Scattering and Electron-positron Plasmas written by Steven Jay Gilbert and published by . This book was released on 2000 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Beams And Their Applications by : Paul G Coleman
Download or read book Positron Beams And Their Applications written by Paul G Coleman and published by World Scientific. This book was released on 2000-01-22 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a coherent and comprehensive overview of the generation and application of mono-energetic positron beams. It has been written by acknowledged experts, at a level accessible to graduate students working, or planning to work, with positron beams, and to scientists in other areas who want to know something about the field.The book begins with a brief historical introduction and an overview of how positron beams are generated and transported. A description of the fate of slow positrons in gaseous and condensed matter, with reference to many of the fundamental measurements made possible by the advent of positron beams, is followed by a discussion on applications in the study of solid surfaces, defect profiling in subsurface regions, interfaces and thin films, and the probing of bulk properties in novel ways. The book ends with a look at the future, considering the prospects for intense positron beams and their potential for further research.
Book Synopsis Intense Low Energy Positron Beams by :
Download or read book Intense Low Energy Positron Beams written by and published by . This book was released on 1993 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intense positron beams are under development or being considered at several laboratories. Already today a few accelerator based high intensity, low brightness e beams exist producing of the order of 108 - 109 e/sec. Several laboratories are aiming at high intensity, high brightness e+ beams with intensities greater than 109 e+/sec and current densities of the order of 1013 - 1014 e+ sec− 1cm−2. Intense e+ beams can be realized in two ways (or in a combination thereof) either through a development of more efficient B+ moderators or by increasing the available activity of B+ particles. In this review we shall mainly concentrate on the latter approach. In atomic physics the main trust for these developments is to be able to measure differential and high energy cross-sections in e+ collisions with atoms and molecules. Within solid state physics high intensity, high brightness e+ beams are in demand in areas such as the re-emission e+ microscope, two dimensional angular correlation of annihilation radiation, low energy e+ diffraction and other fields. Intense e+ beams are also important for the development of positronium beams, as well as exotic experiments such as Bose condensation and Ps liquid studies.
Book Synopsis A Low-energy Positron Beam System by : Paul Walter Hietala
Download or read book A Low-energy Positron Beam System written by Paul Walter Hietala and published by . This book was released on 1968 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Beam Lifetime Spectroscopy at Lawrence Livermore National Laboratory by :
Download or read book Positron Beam Lifetime Spectroscopy at Lawrence Livermore National Laboratory written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defect analysis is needed for samples ranging in thickness from thin films to large engineering parts. We are meeting that need with two positron beam lifetime spectrometers: on on a 3 MeV electrostatic accelerator and the second on our high current linac beam. The high energy beam spectrometer performs positron lifetime analysis on thick samples which can be encapsulated for containment or for in situ measurements in controlled environments. At our high current beam, we are developing a low energy, microscopically focused, pulsed positron beam to enable positron annihilation lifetime spectroscopy for defect specific, 3-D maps with sub-micron location resolution. The data from these instruments with the aid of first principles calculations of defect specific positron lifetimes.
Book Synopsis Studies of Defects in the Near-surface Region and at Interfaces Using Low Energy Positron Beams by :
Download or read book Studies of Defects in the Near-surface Region and at Interfaces Using Low Energy Positron Beams written by and published by . This book was released on 1995 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Positron Annihilation Spectroscopy (PAS) is a powerful probe to study open-volume defects in solids. Its success is due to the propensity of positrons to seek out low-density regions of a solid, such as vacancies and voids, and the emissions of gamma rays from their annihilations that carry information about the local electronic environment. The development of low-energy positron beams allows probing of defects to depths of few microns, and can successfully characterize defects in the near-surface and interface regions of several technologically important systems. This review focuses on recent studies conducted on semiconductor-based systems.
Book Synopsis Trap-Based Beam Formation Mechanisms and the Development of an Ultra-High-Energy-Resolution Cryogenic Positron Beam by : Michael Ryan Natisin
Download or read book Trap-Based Beam Formation Mechanisms and the Development of an Ultra-High-Energy-Resolution Cryogenic Positron Beam written by Michael Ryan Natisin and published by . This book was released on 2016 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: The focus of this dissertation is the development of a positron beam with significantly improved energy resolution over any beam resolution previously available. While positron interactions with matter are important in a variety of contexts, the range of experimental data available regarding fundamental positron-matter interactions is severely limited as compared to analogous electron-matter processes. This difference is due largely to the difficulties encountered in creating positron beams with narrow energy spreads. Described here is a detailed investigation into the physical processes operative during positron cooling and beam formation in state-of-the-art, trap-based beam systems. These beams rely on buffer gas traps (BGTs), in which positrons are trapped and cooled to the ambient temperature (300~K) through interactions with a molecular gas, and subsequently ejected as a high resolution pulsed beam. Experimental measurements, analytic models, and simulation results are used to understand the creation and characterization of these beams, with a focus on the mechanisms responsible for setting beam energy resolution. The information gained from these experimental and theoretical studies was then used to design, construct, and operate a next-generation high-energy-resolution beam system. In this new system, the pulsed beam from the BGT is magnetically guided into a new apparatus which re-traps the positrons, cools them to 50~K, and re-emits them as a pulsed beam with superior beam characteristics. Using these techniques, positron beams with total energy spreads as low as 6.9~meV FWHM are produced. This represents a factor of $\sim 5$ improvement over the previous state-of-the-art, making it the largest increase in positron beam energy resolution since the development of advanced moderator techniques in the early 1980's. These beams also have temporal spreads of $0.9~\mu$s FWHM and radial spreads of 1~mm FWHM. This represents improvements by factors of $\sim 2$ and $10$, respectively, over those of the previous beam resolutions. Future experimental applications of this new technology are also discussed.
Book Synopsis The Construction of a Focused Low Energy Positron Beam Facility and Its Application in the Study of Various Optoelectronic Materials by : Chor-Keung Cheung
Download or read book The Construction of a Focused Low Energy Positron Beam Facility and Its Application in the Study of Various Optoelectronic Materials written by Chor-Keung Cheung and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Applications Using the High Intensity Low-energy Positron Beam at NEPOMUC by : Christoph Hugenschmidt
Download or read book Novel Applications Using the High Intensity Low-energy Positron Beam at NEPOMUC written by Christoph Hugenschmidt and published by . This book was released on 2010 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atomic Physics with Positrons by : J.W. Humberston
Download or read book Atomic Physics with Positrons written by J.W. Humberston and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NATO Advanced Research Workshop on Atomic Physics with Positrons, which was held at University College London during 15-18 July 1987, was the fourth meeting in a series devoted to the general theme of positron colli sions in gases. Previous meetings have been held at York University, Toronto (1981); Royal Holloway College, Egham (1983) and Wayne State Uni versity, Detroit (1985). Recent very significant improvements in positron beam currents, due to the development of more efficient moderators and the use of more intense positron sources, are making possible an increasingly sophisticated range of experiments in atomic collision physics. Whereas a few years ago only total scattering cross sections could be determined, measurements can now be made of various partial and differential cross sections. Intense positron beams are also being used to produce positronium beams and already, as reported here, preliminary investigations have been made of collisions of positronium with several target systems. These experimental developments have stimulated, and been stimulated by, steady, if somewhat less spectacu1ar,progress in associated theoretical studies. Both aspects of the field are well represented in these Proceed ings.
Download or read book Ba lṅai̕ ga da kya ṇa written by and published by . This book was released on 17?? with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Third International Workshop on Positron (Electron)-Gas Scattering, Wayne State University, Detroit, Michigan, July 16-18, 1985 by : Walter E. Kauppila
Download or read book Proceedings of the Third International Workshop on Positron (Electron)-Gas Scattering, Wayne State University, Detroit, Michigan, July 16-18, 1985 written by Walter E. Kauppila and published by . This book was released on 1986 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrostatic Positron Beam for Materials Characterisation by : Elena Abadjieva
Download or read book Electrostatic Positron Beam for Materials Characterisation written by Elena Abadjieva and published by Delft University Press. This book was released on 2003-01-01 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This dissertation describes the design and performance of an electrostatic variable energy positron beam. It is developed to perform Doppler-broadening measurements in the low mm range, positron lifetime measurements and transmission re-moderation experiments. The instrument has been built at Positron Centre Delft. Contents include: Principles of positron annihilation techniques, Positron beam optics, A facility for positron re-moderation experiments, Re-moderation experiments, Design options for a positron beam lifetime spectrometer, A facility for Doppler-broadening measurements in the low-mm range, Doppler-broadening measurements."
Download or read book Positron Physics written by M. Charlton and published by Cambridge University Press. This book was released on 2005-10-13 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and up-to-date account of the field of low energy positrons and positronium within atomic and molecular physics. Each chapter contains a blend of theory and experiment, giving a balanced treatment of all the topics. Useful for graduate students and researchers in physics and chemistry.