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The Fundamental Science Of Nitrogen Doping Of Niobium Superconducting Cavities
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Book Synopsis The Fundamental Science of Nitrogen-doping of Niobium Superconducting Cavities by : Daniel Alfred Gonnella
Download or read book The Fundamental Science of Nitrogen-doping of Niobium Superconducting Cavities written by Daniel Alfred Gonnella and published by . This book was released on 2016 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics and Material Science of Ultra-high Quality Factor Superconducting Resonator by :
Download or read book Physics and Material Science of Ultra-high Quality Factor Superconducting Resonator written by and published by . This book was released on 2015 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nitrogen Doping Study in Ingot Niobium Cavities by :
Download or read book Nitrogen Doping Study in Ingot Niobium Cavities written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal diffusion of nitrogen in niobium superconducting radio frequency cavities at temperature ~800 C has resulted in the increase in quality factor with a low-field Q-rise extending to Bp> 90 mT. However, the maximum accelerating gradient of these doped cavities often deteriorates below the values achieved by standard treatments prior to doping. Here, we present the results of the measurements on ingot niobium cavities doped with nitrogen at 800 C. The rf measurements were carried out after the successive electropolishing to remove small amount of material from the inner surface layer. The result showed higher breakdown field with lower quality factor as material removal increases.
Book Synopsis Studies of the Field-dependent Surface Resistance of Nitrogen-doped Niobium for Superconducting Accelerators by : James Thomas Maniscalco
Download or read book Studies of the Field-dependent Surface Resistance of Nitrogen-doped Niobium for Superconducting Accelerators written by James Thomas Maniscalco and published by . This book was released on 2020 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents new research on the field-dependent surface resistance of nitrogen-doped niobium. We prepared a set of single-cell 1.3 GHz niobium accelerator cavities with nitrogen doping and measured the surface resistance of these cavities. We studied the relation between the field-dependent reduction in the surface resistance (the "anti-Q-slope") and the doping level, finding a strong empirical link between high nitrogen content and the suppression of quasiparticle overheating. We prepared another set of cavities with nitrogen infusion and studied their surface resistance, finding similar behavior to that of the nitrogen-doped cavities despite the stark differences in impurity content. We found evidence suggesting that the anti-Q-slope is a surface effect, depending on the surface concentration of nitrogen and sensitive to surface contamination. We developed a new thermal modeling framework for studying local models of the surface resistance in superconducting niobium cavities with depth-dependent material parameters. We assessed several recent models of the anti-Q-slope, finding that none provide a fully satisfying explanation of the behaviors observed in experiment. Finally, we developed, constructed, and began commissioning the DC Field Dependence Cavity, a new apparatus for investigating the field-dependent surface resistance of nitrogen-doped niobium and other materials under superposed DC and RF surface magnetic fields.
Book Synopsis Modifications of Superconducting Properties of Niobium Caused by Nitrogen Doping Recipes for High Q Cavities by :
Download or read book Modifications of Superconducting Properties of Niobium Caused by Nitrogen Doping Recipes for High Q Cavities written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A study is presented on the superconducting properties of niobium used for the fabrication of the SRF cavities after treating by recently discovered nitrogen doping methods. Cylindrical niobium samples have been subjected to the standard surface treatments applied to the cavities (electro-polishing, l 20°C bake) and compared with samples treated by additional nitrogen doping recipes routinely used to reach ultra-high quality factor values (>3· 1010 at 2 K, 16 MV/m). The DC magnetization curves and the complex magnetic AC susceptibility have been measured. Evidence for the lowered field of first flux penetration after nitrogen doping is found suggesting a correlation with the lowered quench fields. Superconducting critical temperatures Tc = 9.25 K are found to be in agreement with previous measurements, and no strong effect on the critical surface field (Bd) from nitrogen doping was found.
Book Synopsis RF Superconductivity for Accelerators by : Hasan Padamsee
Download or read book RF Superconductivity for Accelerators written by Hasan Padamsee and published by John Wiley & Sons. This book was released on 2008-02-26 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces some of the key ideas of this exciting field, using a pedagogic approach, and presents a comprehensive overview of the field. It is divided into four parts. The first part introduces the basic concepts of microwave cavities for particle acceleration. The second part is devoted to the observed behavior of superconducting cavities. In the third part,general issues connected with beam-cavity interaction and the related issues for the critical components are covered. The final part discusses applications of superconducting cavities to frontier accelerators of the future, drawing heavily on the examples that are in their most advanced stage. Each part of the book ends in a Problems section to illustrate and amplify text material as well as draw on example applications of superconducting cavities to existing and future accelerators.
Book Synopsis Proceedings of the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022 by : Limin Qiu
Download or read book Proceedings of the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022 written by Limin Qiu and published by Springer Nature. This book was released on 2023-11-01 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected papers from the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022 (ICEC28-ICMC 2022), held virtually in Hangzhou, China on 25-29 April 2022, due to COVID-19 pandemic. Highlighting the latest findings on cryogenic engineering and cryogenic materials, it covers topics including: large-scale cryogenic components, processes and systems for refrigeration, separation, and liquefaction of cryogenic fluids, small-scale cryocoolers, cryogenic space applications, thermal insulation, thermal-physical properties of cryogenic fluids and materials, superconducting materials, devices, systems and applications, etc. The book offers valuable information and insights for academic researchers, engineers in the industry, and operators in the cryogenic field.
Book Synopsis Superconducting Radiofrequency Technology for Accelerators by : Hasan Padamsee
Download or read book Superconducting Radiofrequency Technology for Accelerators written by Hasan Padamsee and published by John Wiley & Sons. This book was released on 2023-05-15 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superconducting Radiofrequency Technology for Accelerators Single source reference enabling readers to understand and master state-of-the-art accelerator technology Superconducting Radiofrequency Technology for Accelerators provides a quick yet thorough overview of the key technologies for current and future accelerators, including those projected to enable breakthrough developments in materials science, nuclear and astrophysics, high energy physics, neutrino research and quantum computing. The work is divided into three sections. The first part provides a review of RF superconductivity basics, the second covers new techniques such as nitrogen doping, nitrogen infusion, oxide-free niobium, new surface treatments, and magnetic flux expulsion, high field Q slope, complemented by discussions of the physics of the improvements stemming from diagnostic techniques and surface analysis as well as from theory. The third part reviews the on-going applications of RF superconductivity in already operational facilities and those under construction such as light sources, proton accelerators, neutron and neutrino sources, ion accelerators, and crab cavity facilities. The third part discusses planned accelerator projects such as the International Linear Collider, the Future Circular Collider, the Chinese Electron Positron Collider, and the Proton Improvement Plan-III facility at Fermilab as well as exciting new developments in quantum computing using superconducting niobium cavities. Written by the leading expert in the field of radiofrequency superconductivity, Superconducting Radiofrequency Technology for Accelerators covers other sample topics such as: Fabrication and processing on Nb-based SRF structures, covering cavity fabrication, preparation, and a decade of progress in the field SRF physics, covering zero DC resistance, the Meissner effect, surface resistance and surface impedance in RF fields, and non-local response of supercurrent N-doping and residual resistance, covering trapped DC flux losses, hydride losses, and tunneling measurements Theories for anti-Q-slope, covering the Xiao theory, the Gurevich theory, non-equilibrium superconductivity, and two fluid model based on weak defects Superconducting Radiofrequency Technology for Accelerators is an essential reference for high energy physicists, power engineers, and electrical engineers who want to understand the latest developments of accelerator technology and be able to harness it to further research interest and practical applications.
Book Synopsis Nitrogen and Argon Doping of Niobium for Superconducting Radio Frequency Cavities by :
Download or read book Nitrogen and Argon Doping of Niobium for Superconducting Radio Frequency Cavities written by and published by . This book was released on 2013 with total page 102001 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Superconducting Technology by : Kristian Fossheim
Download or read book Superconducting Technology written by Kristian Fossheim and published by World Scientific. This book was released on 1991 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains an interdisciplinary selection of timely articles which cover a wide range of superconducting technologies ranging from high tech medicine (10-12 Gauss) to multipurpose sensors, microwaves, radio engineering, magnet technology for accelerators, magnetic energy storage, and power transmission on the 109 watt scale. It is aimed primarily at the non-specialist and will be suitable as an introductory course book for those in the relevant fields and related industries. As shown in the title several examples of high-c applications are included. While low-Tc is still the leading technology, for instance, in cables and SQUIDS, case studies in these areas are presented.
Book Synopsis Ultimate Gradient Limitation in Niobium Superconducting Accelerating Cavities by :
Download or read book Ultimate Gradient Limitation in Niobium Superconducting Accelerating Cavities written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present study is addressed to the theoretical description of the ultimate gradient limitation in SRF cavities. Our intent is to exploit experimental data to confirm models which provide feed-backs on how to improve the current state-of-art. New theoretical insight on the cavities limiting factor can be suitable to improve the quench field of N-doped cavities, and therefore to take advantage of high Q0 at high gradients.
Book Synopsis Flux Pinning in Superconductors by : Teruo Matsushita
Download or read book Flux Pinning in Superconductors written by Teruo Matsushita and published by Springer Science & Business Media. This book was released on 2007-07-04 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book deals with the flux pinning mechanisms and properties and the electromagnetic phenomena caused by the flux pinning common for metallic, high-temperature and MgB2 superconductors. The loss originates from the ohmic dissipation of normal electrons in the normal core driven by the electric field induced by the flux motion. Readers will learn why the resultant loss is of hysteresis type in spite of such mechanism.
Book Synopsis Successful Nitrogen Doping of 1.3GHz Single Cell Superconducting Radio-Frequency Cavities *Supported by the National Key Program for S&T Research and Development Under Grant No 2016YFA0400400, and the National Natural Science Foundation of China Under Grant by :
Download or read book Successful Nitrogen Doping of 1.3GHz Single Cell Superconducting Radio-Frequency Cavities *Supported by the National Key Program for S&T Research and Development Under Grant No 2016YFA0400400, and the National Natural Science Foundation of China Under Grant written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of Bulk and Surface Superconducting Properties of N2-doped Cold Worked, Heat Treated and Electro-polished SRF Grade Niobium by :
Download or read book Determination of Bulk and Surface Superconducting Properties of N2-doped Cold Worked, Heat Treated and Electro-polished SRF Grade Niobium written by and published by . This book was released on 2015 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, nitrogen-doped cavities show significant performance improvement in the medium accelerating field regime due to a lowered RF surface resistivity. However, the mechanism of enhancement has not been clearly explained. Our experiments explore how N2-doping influences Nb bulk and surface superconducting properties, and compare the N2-doped properties with those obtained previously with conventionally treated samples. High purity Nb-rod was mechanically deformed and post treated based on a typical SRF cavity treatment recipe. The onset of flux penetration at Hc1, and the upper and the surface critical fields, Hc2 and Hc3, were characterized by magnetic hysteresis and AC susceptibility techniques. The surface depth profile responsible for superconductivity was examined by changing AC amplitude in AC susceptibility, and the microstructure was directly observed with EBSD-OIM. We are also investigating surface chemistry for detailed composition using XPS. We have found that N2-doping at 800 °C significantly reduces the Hc3/Hc2 ratio towards the ideal value of ~1.7, and conclude that AC susceptibility is capable of following changes to the surface properties induced by N2-doping.
Book Synopsis RF Superconductivity by : Hasan Padamsee
Download or read book RF Superconductivity written by Hasan Padamsee and published by John Wiley & Sons. This book was released on 2009-03-30 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Superconductivity written by R.G. Sharma and published by Springer. This book was released on 2015-02-26 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the basics and applications of superconducting magnets. It explains the phenomenon of superconductivity, theories of superconductivity, type II superconductors and high-temperature cuprate superconductors. The main focus of the book is on the application to superconducting magnets to accelerators and fusion reactors and other applications of superconducting magnets. The thermal and electromagnetic stability criteria of the conductors and the present status of the fabrication techniques for future magnet applications are addressed. The book is based on the long experience of the author in studying superconducting materials, building magnets and numerous lectures delivered to scholars. A researcher and graduate student will enjoy reading the book to learn various aspects of magnet applications of superconductivity. The book provides the knowledge in the field of applied superconductivity in a comprehensive way.
Book Synopsis X-Ray Diffraction by : C. Suryanarayana
Download or read book X-Ray Diffraction written by C. Suryanarayana and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this, the only book available to combine both theoretical and practical aspects of x-ray diffraction, the authors emphasize a "hands on" approach through experiments and examples based on actual laboratory data. Part I presents the basics of x-ray diffraction and explains its use in obtaining structural and chemical information. In Part II, eight experimental modules enable the students to gain an appreciation for what information can be obtained by x-ray diffraction and how to interpret it. Examples from all classes of materials -- metals, ceramics, semiconductors, and polymers -- are included. Diffraction patterns and Bragg angles are provided for students without diffractometers. 192 illustrations.
