Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Download Improvement Of Cavity Performance By Electro Polishing In The 13ghz Nb Superconducting Cavities full books in PDF, epub, and Kindle. Read online Improvement Of Cavity Performance By Electro Polishing In The 13ghz Nb Superconducting Cavities ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author : E. Kako
Publisher :
ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (247 download)
Download or read book Improvement of Cavity Performance by Electro-polishing in the 1.3GHz Nb Superconducting Cavities written by E. Kako and published by . This book was released on 1999 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Basic Electropolishing Process Research and Development in Support of Improved Reliable Performance SRF Cavities for the Future Accelerator written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Future accelerators require unprecedented cavity performance, which is strongly influenced by interior surface nanosmoothness. Electropolishing is the technique of choice to be developed for high-field superconducting radiofrequency cavities. Electrochemical impedance spectroscopy (EIS) and related techniques point to the electropolishing mechanism of Nb in a sulfuric and hydrofluoric acid electrolyte of controlled by a compact surface salt film under F- diffusion-limited mass transport control. These and other findings are currently guiding a systematic characterization to form the basis for cavity process optimization, such as flowrate, electrolyte composition and temperature. This integrated analysis is expected to provide optimum EP parameter sets for a controlled, reproducible and uniform surface leveling for Nb SRF cavities.
Author : K. Saito
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (249 download)
Download or read book High Gradient Performance by Electropolishing with 1300 MHz Single and Multi-cell Niobium Superconducting Cavities written by K. Saito and published by . This book was released on 2000 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improved Performance of JLab 7-Cell Cavities by Electropolishing written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The great majority of experience in niobium SRF cavity processing at Jefferson Lab is with BCP etching. This has been used on CEBAF cavities and others totalling over 600 in number. With improved process quality control, field emission is now largely controlled and other factors limit performance. All of the prototype cavities developed for the 12 GeV upgrade, although meeting minimum requirements, have demonstrated a Q-drop in the 17?23 MV/m range that is not remedied by 120 C bake. Most of these cavities received>250 micron removal by BCP etch. Two of these cavities have been electropolished using the protocol under development within ILC R & D activities. The first such cavity was transformed from Q = 3×109 at 17 MV/m to quench from 1×1010 at 35 MV/m. The details of this and subsequent electropolished JLab 7-cell cavities will be reported.
Download or read book Buffered Electropolishing - A New Way for Achieving Extremely Smooth Surface Finish on Nb SRF Cavities to be Used in Particle Accelerators written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Future accelerators require unprecedented cavity performance, which is strongly influenced by interior surface nano-smoothness. Electropolishing (EP) is the technique of choice to be developed for high-field superconducting radio frequency (SRF) cavities. Electrochemical impedance spectroscopy (EIS) and related techniques point to the electropolishing mechanism of Nb in a sulphuric and hydrofluoric acid electrolyte controlled by a compact surface salt film under F- diffusion-limited mass transport control. These and other findings are guiding a systematic characterization to form the basis for cavities process optimization.
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (16 download)
Download or read book Research and Development for Electropolishing of Nb for ILC Accelerator Cavities written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this project are to 1, Expand the scientific and technological understanding of the effect of post-treatment (electropolish, buffered chemical polish, low-temperature baking) on the surface of niobium; 2, Relate the knowledge to the performance of niobium superconducting radiofrequency accelerator cavities; and, 3, Thereby design and demonstrate an electropolish process that can be applied to complete cavities.
Author : Didi Luo
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.6/5 (912 download)
Download or read book Analysis of High Field Q-slope (hfqs) Causes and Development of New Chemical Polishing Acid for Niobium Srf Cavities written by Didi Luo and published by . This book was released on 2020 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Buffered Chemical Polishing (BCP) was the most conventional polishing method for superconducting radiofrequency (SRF) Niobium (Nb) cavity surface preparation before the discovery of Electropolishing (EP), which is superior to BCP in high gradient performance. The High Field Q-slope (HFQS) is entirely eliminated by taking the low-temperature bake (LTB) post EP, which guarantees high gradient performance in EP'ed cavities. The mechanism of the HFQS is well understood for EP'ed cavities. On the other hand, there is no common consensus on the HFQS with BCP, since even BCP with LTB does not always resolve the HFQS. BCP is much easier to apply and still a vital preparation technology for very complicated SRF structures like low beta cavities. Therefore, overcoming the issue of HFQS with BCP is highly beneficial to the SRF community. This thesis mines a large number of available data sets on BCP'ed cavity performance with fine grain, large grain, and even single-crystal niobium materials under different experimental settings. We found that all existing explanations for HFQS with BCP are inconsistent with some experimental results, and propounded nitrogen contamination as a new model to explain the result. Our conclusion is made based on previously unresolved phenomena which include (1) applying multiple BCP post EP; the maximum gradient does not always agree with roughness; (2) cavity treated with EP acid adding a drop of nitric acid started to have non-resolvable HFQS; (3) maximum field of BCP single-crystal cavities are lower than EP large grain cavities; (4) temperature map shows no high roughness area heating for a large-grain BCP cavity. We then checked that nitrogen contamination agrees with all existing data and nicely explains unresolved phenomena.According to this result, we have started developing a new nitrogen-free chemical polishing acid. Hydrogen peroxide with HF mixture was reported able to react with Nb, and there is no extra element contamination in it, so we replace the conventional BCP with this mixture to start our study.We discovered that this new acid could not provide sufficient smooth finishing surface, even after we adjusted all the parameters. However, adding a copper catalyst allows this acid to provide a smooth surface similar to or even better than conventional BCP. The copper remnant can be neglected according to an EDS study on the Nb surface. We studied the reaction mechanism and deduced that several other metals that can be promising as catalysts. One of those is iron, which was later shown to have the catalyst effect; this proved the mechanism we found is right. Further study can focus on other potential catalysts (such as Pb and Sn) and testing cavities treated by these acids. Pb is superconducting under operation temperature, may reduce potential harm to cavity performance, and Sn may react with Nb and generate Niobium Tin on its surface, which is another promising material for SRF cavities. These studies will offer more possibilities for SRF material.
Download or read book Hydrodynamic Thermal Modeling of 9-CELL Ilc Cavity Electropolishing and Implications for Improving the EP Process written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (971 download)
Download or read book Extreme Diffusion Limited Electropolishing of Niobium Radiofrequency Cavities written by and published by . This book was released on 2017 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a deeply modulated, regular, continuous, oscillating current waveform is reliably and repeatably achieved during electropolishing of niobium single-cell elliptical radiofrequency cavities. Details of the technique and cavity test results are reported here. The method is applicable for cavity frequencies in the range 500 MHz to 3.9 GHz and can be extended to multicell structures.
Download or read book Improving Gradient and Q Performance of BCP Etched Multi-cell Cavities by Applying a Light EP. written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have electropolishing (EP) processed several multi-cell cavities previously heavy buffered chemical polishing (BCP) etched. With a surprisingly light EP removal of less than 50 micron, all cavities have shown significant gradient and Q improvement. So far three cavities including two fine-grain niobium 7-cell CEBAF upgrade prototype cavities and one large-grain niobium 9-cell ILC cavities have been treated and tested. The two 7-cell cavities reached a quench limit (without field emission) of 35 MV/m and 25 MV/m, respectively. Another 7-cell cavity has been treated and is under RF test. We give a summary of the test results.
Author : Jean-Fu Kiang
Publisher : Springer Science & Business Media
ISBN 13 : 1475741561
Total Pages : 617 pages
Book Rating : 4.4/5 (757 download)
Download or read book Novel Technologies for Microwave and Millimeter — Wave Applications written by Jean-Fu Kiang and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: Novel Technologies for Microwave and Millimeter-Wave Applications provides an overview of current research status in selected field, to facilitate a learning process from concepts to practices, from component design to system architecture, and from small scale to large scale. Each chapter focuses on a topic and is organized to be self-sufficient. Contents in each chapter include concise description of relevant background information, major issues, current trend and future challenges. Useful references are also listed for further reading. Novel Technologies for Microwave and Millimeter-Wave Applications is suitable as a textbook for senior or graduate courses in microwave engineering.
Author : Ho-Jin Song
Publisher : CRC Press
ISBN 13 : 9814613096
Total Pages : 606 pages
Book Rating : 4.8/5 (146 download)
Download or read book Handbook of Terahertz Technologies written by Ho-Jin Song and published by CRC Press. This book was released on 2015-04-15 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Terahertz waves, which lie in the frequency range of 0.1-10 THz, have long been investigated in a few limited fields, such as astronomy, because of a lack of devices for their generation and detection. Several technical breakthroughs made over the last couple of decades now allow us to radiate and detect terahertz waves more easily, which has trigg
Author : W. H. Dennis
Publisher : Elsevier
ISBN 13 : 148310334X
Total Pages : 273 pages
Book Rating : 4.4/5 (831 download)
Download or read book Electronic Components and Systems written by W. H. Dennis and published by Elsevier. This book was released on 2013-10-22 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electronic Components and Systems focuses on the principles and processes in the field of electronics and the integrated circuit. Covered in the book are basic aspects and physical fundamentals; different types of materials involved in the field; and passive and active electronic components such as capacitors, inductors, diodes, and transistors. Also covered in the book are topics such as the fabrication of semiconductors and integrated circuits; analog circuitry; digital logic technology; and microprocessors. The monograph is recommended for beginning electrical engineers who would like to know the fundamental concepts, theories, and processes in the related fields.
Author : Yuping Duan
Publisher : CRC Press
ISBN 13 : 1315341034
Total Pages : 382 pages
Book Rating : 4.3/5 (153 download)
Download or read book Microwave Absorbing Materials written by Yuping Duan and published by CRC Press. This book was released on 2016-10-14 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the phenomenal development of electromagnetic wave communication devices and stealth technology, electromagnetic wave absorbing materials have been attracting attention as antielectromagnetic interference slabs, stealth materials, self-concealing technology, and microwave darkrooms. This book starts with the fundamental theory of electromagnetic wave absorption in loss medium space, followed by a discussion of different microwave absorbents, such as manganese dioxide, iron-based composite powder, conductive polyaniline, barium titanate powder, and manganese nitride. Then, structural absorbing materials are explored, including multilayer materials, new discrete absorbers, microwave absorption coatings, cement-based materials, and structural pyramid materials. Many of the graphics demonstrate not only the principles of physics and experimental results but also the methodology of computing. The book will be useful for graduate students of materials science and engineering, physics, chemistry, and electrical and electronic engineering; researchers in the fields of electromagnetic functional materials and nanoscience; and engineers in the fields of electromagnetic compatibility and stealth design.
Author : Kenneth J. Button
Publisher : Academic Press
ISBN 13 : 9780121477103
Total Pages : 448 pages
Book Rating : 4.4/5 (771 download)
Download or read book Millimeter Components and Techniques written by Kenneth J. Button and published by Academic Press. This book was released on 1983 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Darko Kajfez
Publisher : Artech House Publishers
ISBN 13 : 9781608071616
Total Pages : 0 pages
Book Rating : 4.0/5 (716 download)
Download or read book Q Factor Measurements Using MATLAB® written by Darko Kajfez and published by Artech House Publishers. This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In electrical engineering, the Q (quality) factor is an important parameter that helps professionals determine the electrical properties of materials and perform microwave and high-frequency measurements. This title provides practitioners with the tools they need to quickly measure the Q factors of resonators.
Author : Mike Golio
Publisher : CRC Press
ISBN 13 : 1420036769
Total Pages : 1377 pages
Book Rating : 4.4/5 (2 download)
Download or read book The RF and Microwave Handbook written by Mike Golio and published by CRC Press. This book was released on 2000-12-20 with total page 1377 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent shift in focus from defense and government work to commercial wireless efforts has caused the job of the typical microwave engineer to change dramatically. The modern microwave and RF engineer is expected to know customer expectations, market trends, manufacturing technologies, and factory models to a degree that is unprecedented in the
