Download or read book Update on the CeC PoP 704 MHz 5 cell Cavity Cryomodule Design and Fabrication written by and published by . This book was released on 2015 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 5-cell SRF cavity operating at 704 MHz will be used for the Coherent Electron Cooling Proof of Principle (CeC PoP) system under development for the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. The CeC PoP experiment will demonstrate the new technique of cooling proton and ion beams that may increase the beam luminosity in certain cases, by as much as tenfold. The 704 MHz cavity will accelerate 2 MeV electrons from a 112 MHz SRF gun up to 22MeV. This paper provides an overview of the design, the project status and schedule of the 704 MHz 5-cell SRF for CeC PoP experiment.

Download or read book Design and Fabrication of an FEL Injector Cryomodule written by M. Cole and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Energy Systems has recently completed the design of a four cavity cryomodule for use as an FEL injector accelerator on the JLAB Injector Test Stand. Fabrication is nearing completion. Four 748.5 MHz single cell superconducting cavities have been completed and are currently at Jefferson Lab for final processing and test prior to integration in the module. This paper will review the design and fabrication of the cavities and cryomodule.

Download or read book Analysis of the Cause of High External Q Modes in the JLab High Gradient Prototype Cryomodule Renascence written by and published by . This book was released on 2008 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Renascence cryomodule [1] installed in CEBAF in 2007 consists of 8 cavities as shown in Figure 1. The first three cavities (No. 1-No. 3) in the upstream end are of the Low Loss (LL) shape design, and the remaining 5 cavities (No. 4-No. 8) on the beam downstream end are the High Gradient (HG) shape design. The fundamental power couplers (FPCs) are the rectangular waveguides, and the little cylindrical structures are the HOM couplers. The locations of the FPC in the last four cavities are mirrored about the beam z axis. Cavities No. 4 and No. 5 form a back-to-back cavity pair. Among the HG cavities installed in the Renascence cryomodule, the only identifiable difference from their fabrication documentation is that cavity No. 5 received an extra EBW pass on one equator weld, specifically cell 5. The non-uniform mechanical tuning required to compensate the fundamental mode tune and flatness for the extra shrinkage of this cell is believed to contribute the most significant differences from the other HG cavities. Beam based instability studies on this cryomodule in CEBAF have shown a significant beam breakup (BBU) threshold current reduction, well below design value. Frequency spectrum peaked by the off-sided beam power indicated the cause is due to abnormal high Q modes in the cavity No. 5. Measured beam off-axis position at the cavity No. 5 does not correspond to the shunt impedances calculated for an ideal cavity. Low power RF measurements have identified that the problematic modes are in the second dipole band (TM110 like). Three of the modes have external Qs two orders magnitude higher than the others, while the rest of modes in the first two dipole bands are normal in terms of the design values. The cause of this abnormality and the future impact on the BBU was not able to be resolved due to the limitations of information that can be obtained from the measurements. It is important to understand the cause of this abnormality so that effective QA/QC measures can be implemented to avoid such problem in the final upgrade design and manufacture. The goal of this work is to utilize advanced simulation tools to understand the high external Q (Q{sub ext}) problem observed in the Renascence cryomodule. In the past years, SLAC has built a set of state-of-the-art advanced simulation tools based on finite-element unstructured meshes and parallel computation implementations on supercomputers [2, 3]. The codes are capable of simulating large complex RF systems with unprecedented resolution and turnaround time. They have been successfully applied to many existing and future accelerator R & D projects to improve the machine performance and to optimize the designs. These tools are essential to perform accurate full system analyses such as the JLab's SRF cavities. We will use the simulation results and the data from the RF measurements to gain a better understanding of the cavity performance and tolerance issues and provide a solid foundation to do the BBU simulation and prediction for the 12GeV Upgrade project by using JLab's BBU codes. In this report, we will focus on the following two main tasks: (1) Ideal cavity simulation--to evaluate the effectiveness of the damping by the higher-order-mode (HOM) couplers, and search for possible trapped modes in a back-to-back cavity pair (e.g. cavity No. 4 & No. 5). (2) Abnormal cavity study--to understand the cause of the high Q{sub ext} modes in cavity No. 5 using an advanced Shape Determination Tool.

Download or read book Accelerator Physics Technology and Applications written by Alex Chao and published by World Scientific. This book was released on 2004 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally invented for generating the first artificial nuclear reactions, particle accelerators have undergone, during the past 80 years, a fascinating development that is an impressive example of the inventiveness and perseverance of scientists and engineers. Since the early 1980s, accelerator science and technology has been booming. Today, accelerators are the prime tool for high energy physics to probe the structure of matter to an unknown depth. They are also, as synchrotron radiation sources, the most versatile tool for characterizing materials and processes and for producing micro- and nanostructured devices. The determination of the structure of large biomolecules is presently among the best examples of the application of synchrotron radiation. Finally, accelerators have grown more and more important for medicine, which is relying on them for advanced cancer therapy and radio-surgery. And there are more applications, including the generation of neutrons for materials science, the transmutation of nuclear waste with simultaneous production of electrical power, the sterilization of medical supplies and of foodstuff, and the inspection of trucks by customs or security services. This book is meant to provide basic training in modern accelerators for students, teachers, and interested scientists and engineers working in other fields. It is a result of the 3rd International Accelerator School, held in 2002 in Singapore under the auspices of the Overseas Chinese Physics Association (OCPA). Reputable experts, including a recent prize-winner, cover the field of cyclic and linear accelerators from the basic theoretical tools to forefront developments such as the X-ray free electron laser or the latest proton therapy facilities under construction. Accelerators, the art of building them, and the science for understanding their function have become a very exciting field of research. This book conveys the excitement of the experts to the reader. The proceedings have been selected for coverage in: . OCo Index to Scientific & Technical Proceedings- (ISTP- / ISI Proceedings). OCo Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings). OCo CC Proceedings OCo Engineering & Physical Sciences."

Download or read book Superconductivity and Its Applications written by Yi-Han Kao and published by American Institute of Physics. This book was released on 1992 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book HIE ISOLDE the Technical Options written by European Organization for Nuclear Research and published by . This book was released on 2006 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Discourse Studies Reader written by Johannes Angermuller and published by John Benjamins Publishing Company. This book was released on 2014-06-19 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discourse Studies is an interdisciplinary field studying the social production of meaning across the entire spectrum of the social sciences and humanities. The Discourse Studies Reader brings together 40 key readings from discourse researchers in Europe and North America, some of which are now translated into English for the first time. Divided into seven sections – ‘Theoretical Inspirations: Structuralism versus Pragmatics’, ‘From Structuralism to Poststructuralism’, ‘Enunciative Pragmatics’, ‘Interactionism’, ‘Sociopragmatics’, ‘Historical Knowledge’ and ‘Critical Approaches’ – The Discourse Studies Reader offers a comprehensive overview of the main currents in discourse studies, both discourse theory and discourse analysis. With short introductions elaborating the broader context, the sections present key selections from a variety of disciplinary backgrounds by placing them into their respective epistemological traditions. The Discourse Studies Reader is an indispensable textbook for students and scholars alike who are interested in discourse theoretical questions and working with discourse analytical methods.

Download or read book High Temperature Superconductivity 2 written by Anant V. Narlikar and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: In contrast to research on the fundamental mechanisms of High-Temperature Superconductivity, in recent years we have seen enormous developments in the fabrication and application of High-Tc-superconductors. The two volumes of High Temperature Superconductivity provide a survey of the state of the technology and engineering applications of these materials. They comprise extended original research papers and technical review articles written by physicists, chemists, materials scientists and engineers, all of them noted experts in their fields. The interdisciplinary and strictly application-oriented coverage should benefit graduate students and academic researchers in the mentioned areas as well as industrial experts. Volume 1 "Materials" focuses on major technical advancements in High-Tc materials processing for applications. Volume 2 "Engineering Applications" covers numerous application areas where High-Tc superconductors are making tremendous impact.

Download or read book Language and Communication at Work written by François Cooren and published by . This book was released on 2014-03 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines language and communication as an inherent part of on-going organizational processes. It explores language and communication as constitutive of work; analyses how they actually 'work'; and examines their role as part of strategic and institutional work in and around organizational phenomena.

Download or read book Multilingual Encounters in Europe s Institutional Spaces written by Johann W. Unger and published by A&C Black. This book was released on 2014-02-27 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multilingual encounters have been commonplace in many types of institutions, and have become an essential part of supranational institutions such as the EU since their inception. This volume explores and discusses different ways of researching the discursive dimension of these encounters, and critically examines their relevance to policy, politics and society as a whole. This includes institutions at the local, regional and supranational level. Multilingualism in institutions is currently often seen as an obstacle rather than an opportunity, at least with respect to European public and private spheres. The volume asks: - exactly how is multilingualism conceptualized and talked about in different institutions? - how do different institutions 'deal' with multilingualism, both internally and externally? - what are the policy making rules and challenges for the future for various institutions with respect to multilingualism?

Download or read book Disability Spaces and Places of Policy Exclusion written by Karen Soldatic and published by Routledge. This book was released on 2014-06-27 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geographies of disability have become a key research priority for many disability scholars and geographers. This edited collection, incorporating the work of leading international disability researchers, seeks to expand the current geographical frame operating within the realm of disability. Providing a critical and comprehensive examination of disability and spatial processes of exclusion and inclusion for disabled people, the book uniquely brings together insights from disability studies, spatial geographies and social policy with the purpose of exploring how spatial factors shape, limit or enhance policy towards, and the experiences of, disabled people. Divided into two parts, the first section explores the key concepts to have emerged within the field of disability geographies, and their relationship to new policy regimes. New and emerging concepts within the field are critically explored for their significance in conceptually framing disability. The second section provides an in-depth examination of disabled people’s experience of changing landscapes within the onset of emerging disability policy regimes. It deals with how the various actors and stakeholders, such as governments, social care agencies, families and disabled people traverse these landscapes under the new conditions laid out by changing policy regimes. Crucially, the chapters examine the lived meaning of changing spatial relations for disabled people. Grounded in recent empirical research, and with a global focus, each of the chapters reveal how social policy domains are challenged or undermined by the spatial realities faced by disabled people, and expands existing understandings of disability. In turn, the book supports readers to grasp future policy directions and processes that enable disabled people's choices, rights and participation. This important work will be invaluable reading for students and researchers involved in disability, geography and social policy.

Download or read book The role of body and environment in cognition written by Dermot Lynott and published by Frontiers E-books. This book was released on 2014-08-25 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent evidence has shown many ways in which our bodies and the environment influence cognition. In this Research Topic we aim to develop our understanding of cognition by considering the diverse and dynamic relationship between the language we use, our bodily perceptions, and our actions and interactions in the broader environment. There are already many empirical effects illustrating the continuity of mind- body-environment: manipulating body posture influences diverse areas such as mood, hormonal responses, and perception of risk; directing attention to a particular sensory modality can affect language processing, signal detection, and memory performance; placing implicit cues in the environment can impact upon social behaviours, moral judgements, and economic decision making. This Research Topic includes papers that explore the question of how our bodies and the environment influence cognition, such as how we mentally represent the world around us, understand language, reason about abstract concepts, make judgements and decisions, and interact with objects and other people. Contributions focus on empirical, theoretical, methodological or modelling issues as well as opinion pieces or contrasting perspectives. Topic areas include, perception and action, social cognition, emotion, language processing, modality-specific representations, spatial representations, gesture, atypical embodiment, perceptual simulation, cognitive modelling and perspectives on the future of embodiment.

Download or read book Contemporary Critical Discourse Studies written by Christopher Hart and published by Bloomsbury Publishing. This book was released on 2014-11-07 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: CDS is a multifarious field constantly developing different methodological frameworks for analysing dynamically evolving aspects of language in a broad range of socio-political and institutional contexts. This volume is a cutting-edge, interdisciplinary account of these theoretical and empirical developments. It presents an up-to-date survey of Critical Discourse Studies (CDS), covering both the theoretical landscape and the analytical territories that it extends over. It is intended for critical scholars and students who wish to keep abreast of the current state of the art. The book is divided into two parts. In the first part, the chapters are organised around different methodological perspectives for CDS (history, cognition, multimodality and corpora, among others). In the second part, the chapters are organised around particular discourse types and topics investigated in CDS, both traditionally (e.g. issues of racism and gender inequality) and only more recently (e.g. issues of health, public policy, and the environment). This is, altogether, an essential new reference work for all CDS practitioners.

Download or read book High Frequency Trading and Limit Order Book Dynamics written by Ingmar Nolte and published by Routledge. This book was released on 2016-04-14 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together the latest research in the areas of market microstructure and high-frequency finance along with new econometric methods to address critical practical issues in these areas of research. Thirteen chapters, each of which makes a valuable and significant contribution to the existing literature have been brought together, spanning a wide range of topics including information asymmetry and the information content in limit order books, high-frequency return distribution models, multivariate volatility forecasting, analysis of individual trading behaviour, the analysis of liquidity, price discovery across markets, market microstructure models and the information content of order flow. These issues are central both to the rapidly expanding practice of high frequency trading in financial markets and to the further development of the academic literature in this area. The volume will therefore be of immediate interest to practitioners and academics. This book was originally published as a special issue of European Journal of Finance.

Download or read book Confronting Secularism in Europe and India written by Brian Black and published by A&C Black. This book was released on 2014-06-19 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Can secularism continue to provide a foundation for political legitimacy? It is often claimed that one of the cultural achievements of the West has been its establishment of secular democracy, wherein religious belief is respected but confined to the sphere of private belief. In more recent times, however, political secularism has been increasingly called into question. Religious believers, in numerous traditions, have protested against the distortion and confinement that secularism imposes on their faith. Others have become uneasily aware of the way in which secularism no longer commands universal assent in the way it once did. Confronting Secularism in Europe and India adds to this debate by staging a creative encounter between European and Indian conceptions of secularism with a view to continuing new and distinctive trajectories of thought about the place and role of secularism in contemporary times. Looking at political secularism, the relationship between secularism and religion, and religious and secular violence, this book considers whether there are viable alternatives to secularism in Europe and in India.

Download or read book Historians Across Borders written by Nicolas Barreyre and published by Univ of California Press. This book was released on 2014-03-14 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this stimulating and highly original study of the writing of American history, twenty-four scholars from eleven European countries explore the impact of writing history from abroad. Six distinguished scholars from around the world add their commentaries. Arguing that historical writing is conditioned, crucially, by the place from which it is written, this volume identifies the formative impact of a wide variety of institutional and cultural factors that are commonly overlooked. Examining how American history is written from Europe, the contributors shed light on how history is written in the United States and, indeed, on the way history is written anywhere. The innovative perspectives included in Historians across Borders are designed to reinvigorate American historiography as the rise of global and transnational history is creating a critical need to understand the impact of place on the writing and teaching of history. This book is designed for students in historiography, global and transnational history, and related courses in the United States and abroad, for US historians, and for anyone interested in how historians work.

Download or read book Advances and Innovations in University Assessment and Feedback written by Carolin Kreber and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores changing perspectives and innovations in assessment in light of recent theorising and empirical research ...