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Electrostatic Positron Beam For Materials Characterisation
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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."
Book Synopsis Positron-beam Techniques for Materials Characterization by : Derek W. Lawther
Download or read book Positron-beam Techniques for Materials Characterization written by Derek W. Lawther and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Spectroscopy of Solids by : Società italiana di fisica
Download or read book Positron Spectroscopy of Solids written by Società italiana di fisica and published by IOS Press. This book was released on 1995 with total page 807 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lifetime of a positron inside a solid is normally less than a fraction of nanosecond. This is a very short time on a human scale, but is long enough to enable the positron to visit an extended region of the material, and to sense the atomic and electronic structure of the environment. Thus, we can inject a positron in a sample to draw from it some signal giving us information on the microscopic properties of the material. This idea has been successfully developed in a number of positron-based techniques of physical analysis, with resolution in energy, momentum, or position. The complex of these techniques is what we call now positron spectroscopy of solids. The field of application of the positron spectroscopy extends from advanced problems of solid-state physics to industrial applications in the area of characterization of high-tech materials. This volume focuses the attention on the physics that can be learned from positron-based methods, but also frames those methods in a wider context including other experimental approaches. It can be considered as a textbook on positron spectroscopy of solids, the sort of book that the newcomer takes for his approach to this field, but also as a useful research tool for the expert.
Book Synopsis (DURIP98/99) Slow Positron Beam for Material and Surface Characterization by :
Download or read book (DURIP98/99) Slow Positron Beam for Material and Surface Characterization written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variable, mono-energetic slow positron beam (0-30 keV) coupled with Doppler broadening of annihilation radiation and positron lifetime measurements has been constructed at the University of Missouri-Kansas City. The beam is ideal for surface and materials characterization of defects of polymeric and coating materials in the range of sub-nanometer on the surface to a few microns in the bulk. This instrument becomes one of five slow positron beams currently available in the US for research on sub-nanometer defects and for training students and scientists in defense-related research. The performance of the beam, the counting rate and the resolution, is one of the best in the world.
Book Synopsis Materials Analysis Using Positron Beam Lifetime Spectroscopy by :
Download or read book Materials Analysis Using Positron Beam Lifetime Spectroscopy written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We are using a defect analysis capabilities based on two positron beam lifetime spectrometers: the first is based on a 3 MeV electrostatic accelerator and the second on our high current linac beam. The high energy beam lifetime spectrometer is routinely used to perform positron lifetime analysis with a 3 MeV positron beam on thick sample specimens. It is being used for bulk sample analysis and analysis of samples encapsulated in controlled environments for in situ measurements. A second, low energy, microscopically focused, pulsed positron beam for defect analysis by positron lifetime spectroscopy is under development at the LLNL high current positron source. This beam will enable defect-specific, 3-dimensional maps of defect concentration with sub-micron location resolution. When coupled with first principles calculations of defect specific positron lifetimes it will enable new levels of defect concentration mapping and defect identification.
Book Synopsis Positron Profilometry by : Jerzy Dryzek
Download or read book Positron Profilometry written by Jerzy Dryzek and published by Springer Nature. This book was released on 2023-09-08 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of positron profilometry, specifically focusing on the analysis of defect depth distribution in materials. Positron profilometry plays a crucial role in understanding and characterizing defects in a wide range of materials, including metals, semiconductors, polymers, and ceramics. By analyzing the depth distribution of defects, researchers can gain insights into various material properties, such as crystal structure, defect density, and diffusion behavior. The author's extensive research spanning a period of two decades has primarily centered on subsurface zones. These regions, located beneath the surface and subjected to various surface processes, play a crucial role in generating defect distributions. Three experimental techniques and their data analysis are described in detail: a variable-energy positron beam (VEP) called sometimes a slow positron beam, a technique called implantation profile depth scanning (DSIP), and a sequential etching (SET) technique. The usability of these techniques is illustrated by many examples of measurements by the author and others.
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 An Electrostatic Positron Beam and Its Use in an Experimental Investigation of the First Excited State of Positronium by : David John Day
Download or read book An Electrostatic Positron Beam and Its Use in an Experimental Investigation of the First Excited State of Positronium written by David John Day and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Positron Spectroscopy for Materials Characterization by :
Download or read book Positron Spectroscopy for Materials Characterization written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the more active areas of research on materials involves the observation and characterization of defects. The discovery of positron localization in vacancy-type defects in solids in the 1960's initiated a vast number of experimental and theoretical investigations which continue to this day. Traditional positron annihilation spectroscopic techniques, including lifetime studies, angular correlation, and Doppler broadening of annihilation radiation, are still being applied to new problems in the bulk properties of simple metals and their alloys. In addition new techniques based on tunable sources of monoenergetic positron beams have, in the last 5 years, expanded the horizons to studies of surfaces, thin films, and interfaces. In the present paper we briefly review these experimental techniques, illustrating with some of the important accomplishments of the field. 40 refs., 19 figs.
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 Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "The Construction of a Focused Low Energy Positron Beam Facility and Its Application in the Study of Various Optoelectronic Materials" by Chor-keung, Cheung, 張初強, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled THE CONSTRUCTION OF A FOCUSED LOW ENERGY POSITRON BEAM FACILITY AND ITS APPLICATION IN THE STUDY OF VARIOUS OPTOELECTRONIC MATERIALS submitted by CHEUNG Chor Keung for the Degree of Doctor of Philosophy at The University of Hong Kong in August 2006 Lowenergypositronbeamshaveanimportantplaceinmaterialssciencebecause they allow non-destructive observations to be made on the nature of crystal de- fects as a function of depth. The old positron beam facility at the University of Hong Kong that operated between 1996 and 2001 had a relatively large beam 4 + 1 diameter of1/4 6 mm and a low intensity1/4 10 e s . As such it had limited use in depth defect proling of metal-semiconductor systems. The studies per- formed in this work have involved a reconstruction of the HKU positron beam so as to make the focused spot at the target with submillimeter diameter. The 5 + 1 beam intensity has been increased up to 1 10 e s .Thenewdesignofthefacilityrequirespositronstobeemittedfromthemod- erator in a magnetic eld free region so as to minimize the canonical angular momentum carried by the particles. The hybrid lens system employed consists of a standard Soa extraction lens in a magnetic eld free region followed by a gridded Einzel lens that focuses positrons into a 100 G magnetic funnel at an energy of 10 keV. After E B ltering the positrons are transported to the target. The nal focus at the target is adjusted by changing the magnetic eld near the target chamber. The slow positron beam system has been successfully constructedanditsperformancematchescomputersimulations. Theimplemen- tation of the Variable Energy-Doppler Broadening of Annihilation Radiation Spectroscopy (VEDBARS) to the beam allows taking standard defect-depth measurement. Coincidence Doppler Broadening Spectroscopy(CDBS) has also been installed for more detailed defect characterization. The beam is equipped with an S parameter imaging system for diagnosing defect patterns, and loca- tion of surface metalizations. PositronAnnihilationSpectroscopy(PAS)employingtheslowpositronbeam facilityhas been demonstrated in various studies of a number of optoelectronics materials. These include the study of the interfacial properties of several insu- lating oxide layers grown on InP substrate, the study of defect characterization onsmalldimensionITOcontactsgrownon n-GaNunderdi(R)erentgaseousenvi- ronments, the porosity characterization of porous silicon and the study of ZnO nanorodsgrownonSisubstrateunder di(R)erentgaseous ambientsandannealing temperatures. These measurements clearly demonstrate that the reconstructed well focused slow positron beam facility is useful as a non-destructive tool for open volume defect studies in optoelectronics materials. DOI: 10.5353/th_b3743492 Subjects: Positron beams Optoelectronic devises - Defects Optoelectronics - Materials
Book Synopsis Application of Positron Spectroscopy to Materials Science by : Lester D. Hulett
Download or read book Application of Positron Spectroscopy to Materials Science written by Lester D. Hulett and published by Trans Tech Publications Ltd. This book was released on 1994-11-24 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to identify, discuss, and evaluate the applications of positron spectroscopy to materials science. Many applications to material science are identified. As there is need for intense sources of monoenergetic positrons in order for the field to reach its full potential, several designs for such sources are reported. Recommendations for policies and actions that will promote the transfer of positron spectroscopy technology to private industry have been worked out.
Book Synopsis Positron Scattering in Gases by : John W. Humberston
Download or read book Positron Scattering in Gases written by John W. Humberston and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first conference in this series, devoted principally to the interaction of positrons in gases, was held at York University, Toronto, in July 1981 immediately preceding the XII ICPEAC in Gatlinburg, and the proceedings were published in the Canadian Journal of Physics, volume 60 (1982). So successful was this meeting that the decision was taken to hold a second one around the time of XIII ICPEAC in Berlin in 1983. London was clearly a convenient location but, rather than the obvious choice of University College London in central London, the Organising Committee decided that the beautiful and peaceful surroundings of Royal Holloway College would provide a more pleasant and intimate atmosphere for a small meeting. Even a small conference requires substantial sums of money to pay the expenses of invited speakers and when considering possible sources of funds the Organising Committee recognised that the intended format of the meeting and the international composition of the participants made it appropriate to apply to the NATO Science Committee for support under the Advanced Research Workshop Programme. This was one of the few successful applications made this year, and so it was that the conference became the 'NATO Advanced Research Workshop on Positron Scattering in Gases'. The Workshop, with approximately sixty participants, started after lunch on 19 July, 1983 and finished at mid-day on 23 July.
Book Synopsis An Electrostatic Positron Beam and Its Use in a Study of the First Excited State of Positronium by :
Download or read book An Electrostatic Positron Beam and Its Use in a Study of the First Excited State of Positronium written by and published by . This book was released on 1993 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reviews of Accelerator Science and Technology by : Alex Chao
Download or read book Reviews of Accelerator Science and Technology written by Alex Chao and published by World Scientific. This book was released on 2012-02-20 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trends for electron beam accelerator applications in industry / Sueo Machi -- Ion implantation for semiconductor doping and materials modification / Lawrence A. Larson, Justin M. Williams and Michael I. Current -- Ion beam analysis: a century of exploiting the electronic and nuclear structure of the atom for materials characterisation / Chris Jeynes, Roger P. Webb and Annika Lohstroh -- Neutrons and photons in nondestructive detection / J.F. Harmon, D.P. Wells and A.W. Hunt -- Review of cyclotrons for the production of radioactive isotopes for medical and industrial applications / Paul Schmor -- Development of accelerator mass spectrometry and its applications / Jiaer Chen [und weitere] -- Electron accelerators for environmental protection / Andrzej G. Chmielewski -- Studying radiation damage in structural materials by using ion accelerators / Peter Hosemann -- Direct current accelerators for industrial applications / Ragnar Hellborg and Harry J. Whitlow -- Radio-frequency electron accelerators for industrial applications / Marshall R. Cleland -- Accelerators for neutron generation and their applications / Guenter Mank, Guenter Bauer and Francoise Mulhauser -- Prospects for accelerator technology / Alan Todd -- CERN: from birth to success / Herwig Schopper -- Simon van der Meer (1925-2011): a modest genius of accelerator science / Vinod C. Chohan
Book Synopsis Production and Characterization of a Slow Positron Beam by : Derek Fawcett
Download or read book Production and Characterization of a Slow Positron Beam written by Derek Fawcett and published by . This book was released on 1989 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spectral and Spatial Characterisation of Laser-driven Positron Beams by :
Download or read book Spectral and Spatial Characterisation of Laser-driven Positron Beams written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The generation of high-quality relativistic positron beams is a central area of research in experimental physics, due to their potential relevance in a wide range of scientific and engineering areas, ranging from fundamental science to practical applications. There is now growing interest in developing hybrid machines that will combine plasma-based acceleration techniques with more conventional radio-frequency accelerators, in order to minimize the size and cost of these machines. Here we report on recent experiments on laser-driven generation of high-quality positron beams using a relatively low energy and potentially table-top laser system. Lastly, the results obtained indicate that current technology allows to create, in a compact setup, positron beams suitable for injection in radio-frequency accelerators.
Book Synopsis Positron Annihilation ICPA-11 by : Y. C. Jean
Download or read book Positron Annihilation ICPA-11 written by Y. C. Jean and published by . This book was released on 1997 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt: For one and a half decades, the application of positron annihilation to condensed-matter physics concentrated on the study of the Fermi surfaces of metals and alloys. As other, often more powerful, techniques for performing this type of study were developed, it appeared that condensed-matter positron physics was going to be relegated to being a niche interest. However, the situation changed dramatically when it was found that measurements of positron annihilation in metals were sensitive to the structures of well-known defects. This discovery, and subsequent research made it a major tool in materials science.
