Author: Valery D. Shemelin Publisher: Springer Nature ISBN: 3030481980 Category : Science Languages : en Pages : 145
Book Description
This book is written by two world-recognized experts in radio frequency (RF) systems for particle accelerators and is based on many years of experience in dealing with the multipactor phenomenon. The authors introduce and review multipactor in RF cavities for scientists and engineers working in the field of accelerator physics and technology. The multipactor phenomenon of unintended electron avalanches occurs in the RF cavities commonly and quite often is a performance-limiting factor. The book starts with an Introductory Overview which contains historical observations and brief description of most common aspects of the phenomenon. Part I deals with the multipactor in a flat gap. It starts with description of the dynamics of electrons, derivation of the stability condition and analyzing influence of several factors on the multipactor. Then, the initial considerations are extended to derive a generalized phase stability and finally a particular case, called ping-pong multipacting, is considered. The part one is concluded with a brief review of computer codes used in multipactor simulations. Part II is dedicated to the multipactor in crossed RF fields, the typical situation in accelerating cavities. Two cases of MP are considered: a two-point multipactor near the cavity equator in elliptical cavities and a one-point multipactor. Part III describes optimization of the cavity shapes geared toward designing multipactor-free structures. The book will serve as an importance reference on multipactor for those involved in developing and operating radio frequency cavities for particle accelerators.
Author: Thomas Wesley Hall Publisher: ISBN: Category : Languages : en Pages : 184
Book Description
Radio frequency (RF) particle accelerators are a key component to many scientific and industrial endeavors, so their reliable operation is of great concern. An obstacle to reliable operation has been the performance of the RF windows that act as barriers between the vacuum environment of the accelerating cavities and atmospheric conditions in the transmission line. Failures of these windows have a large impact on accelerator availability, and recovering from a window failure is a multiple day event. In order to mitigate these failures, an analysis of the stresses placed on the window has been performed. This dissertation presents simulations of the stresses placed on the window due to the electromagnetic environment and the multipactor effect with a discussion of how to minimize those stresses. The electromagnetic environment was first analyzed using the commercially available CST Microwave Studio software. An analysis of the window geometry in isolation from the accelerating cavity is performed first to minimize the stresses placed on it. Then the analysis of the whole system with the cavity present was performed using an approach that was developed to allow transient simulations of the highly resonant cavity. Simulations show how the signal develops over time, thus allowing adjustments to be made to the driving signal to minimize stresses. Simulations also demonstrate the effect of harmonics and their excitement of higher order modes, and the effect of an off-resonant cavity is briefly discussed. Multipactor is a parasitic phenomenon whereby large electron populations accumulate and is common to accelerator systems. The principles and simulation techniques of multipactor are first presented, and benchmarks are presented to illustrate the validity of the simulations. The conditions of both traveling and standing waves are examined for the effect on multipactor development and electron collisions with the window. The broad analysis of many standing wave conditions allows for mitigation of multipactor in consideration of the signal analyzed in the electromagnetic simulations. Effects of window material and charge accumulation on the window are discussed, and the consideration of the harmonics and higher order modes analyzed previously are shown to have negligible effect on multipactor.
Author: Peter M.A. Sloot Publisher: Springer ISBN: 3540477896 Category : Computers Languages : en Pages : 1265
Book Description
Computational Science is the scientific discipline that aims at the development and understanding of new computational methods and techniques to model and simulate complex systems. The area of application includes natural systems - such as biology environ mental and geo-sciences, physics, and chemistry - and synthetic systems such as electronics and financial and economic systems. The discipline is a bridge bet ween 'classical' computer science - logic, complexity, architecture, algorithm- mathematics, and the use of computers in the aforementioned areas. The relevance for society stems from the numerous challenges that exist in the various science and engineering disciplines, which can be tackled by advances made in this field. For instance new models and methods to study environmental issues like the quality of air, water, and soil, and weather and climate predictions through simulations, as well as the simulation-supported development of cars, airplanes, and medical and transport systems etc. Paraphrasing R. Kenway (R.D. Kenway, Contemporary Physics. 1994): 'There is an important message to scientists, politicians, and industrialists: in the future science, the best industrial design and manufacture, the greatest medical progress, and the most accurate environmental monitoring and forecasting will be done by countries that most rapidly exploit the full potential of computational science'. Nowadays we have access to high-end computer architectures and a large range of computing environments, mainly as a consequence of the enormous sti mulus from the various international programs on advanced computing, e.g.
Author: Hasan Padamsee Publisher: John Wiley & Sons ISBN: 3527627189 Category : Technology & Engineering Languages : en Pages : 464
Book Description
This is the second book to RF Superconducting, written by one of the leading experts. The book provides fast and up-to-date access to the latest advances in the key technology for future accelerators. Experts as well as newcomers to the field will benefit from the discussion of progress in the basic science, technology as well as recent and forthcoming applications. Researchers in accelerator physics will also find much that is relevant to their discipline.
Author: Christine Petit-jean-genaz Publisher: World Scientific ISBN: 9814550272 Category : Languages : en Pages : 2968
Book Description
These proceedings aim to provide a comprehensive overview of research, technology and applications in the field of accelerators. Contributions from the entire field of accelerators are presented, including low and high energy machines, and medical and industrial accelerators.
Author: Herwig Schopper Publisher: World Scientific ISBN: 9814579726 Category : Science Languages : en Pages : 765
Book Description
This volume, consisting of articles written by experts with international repute and long experience, reviews the state of the art of accelerator physics and technologies and the use of accelerators in research, industry and medicine. It covers a wide range of topics, from basic problems concerning the performance of circular and linear accelerators to technical issues and related fields. Also discussed are recent achievements that are of particular interest (such as RF quadrupole acceleration, ion sources and storage rings) and new technologies (such as superconductivity for magnets and RF cavities).The book will interest not only researchers and engineers in the field of accelerator development but also users of accelerators in research and industry. Moreover, teachers giving courses on accelerators and their applications will profit by learning about the most recent achievements and future possibilities.
Author: Valery D. Shemelin
Author: Thomas Wesley Hall
Author: R. J. Burton
Author: 
Author: Peter M.A. Sloot
Author: Peter Hutson Ceperley
Author: Hasan Padamsee
Author: Christine Petit-jean-genaz
Author: 
Author: Herwig Schopper