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Author : William Michael Roach
Release : 2014
Genre : Linear accelerators
Kind : eBook
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Book Synopsis Superconducting Thin Films for SRF Cavity Applications by : William Michael Roach
Download or read book Superconducting Thin Films for SRF Cavity Applications written by William Michael Roach. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stuart Wilde
Release : 2017
Genre :
Kind : eBook
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Book Synopsis Development of Superconducting Thin Films for Use in SRF Cavity Applications by : Stuart Wilde
Download or read book Development of Superconducting Thin Films for Use in SRF Cavity Applications written by Stuart Wilde. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Douglas B. Beringer
Release : 2017
Genre : Linear accelerators
Kind : eBook
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Book Synopsis Thin Film Approaches to the SRF Cavity Problem by : Douglas B. Beringer
Download or read book Thin Film Approaches to the SRF Cavity Problem written by Douglas B. Beringer. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt: Superconducting Radio Frequency (SRF) cavities are responsible for the acceleration of charged particles to relativistic velocities in most modern linear accelerators, such as those employed at high-energy research facilities like Thomas Jefferson National Laboratory’s CEBAF and the LHC at CERN. Recognizing SRF as primarily a surface phenomenon enables the possibility of applying thin films to the interior surface of SRF cavities, opening a formidable tool chest of opportunities by combining and designing materials that offer greater benefit. Thus, while improvements in radio frequency cavity design and refinements in cavity processing techniques have improved accelerator performance and efficiency – 1.5 GHz bulk niobium SRF cavities have achieved accelerating gradients in excess of 35 MV/m – there exist fundamental material bounds in bulk superconductors limiting the maximally sustained accelerating field gradient (approximately 45 MV/m for Niobium) where inevitable thermodynamic breakdown occurs. With state of the art niobium based cavity design fast approaching these theoretical limits, novel material innovations must be sought in order to realize next generation SRF cavities. One proposed method to improve SRF performance is to utilize thin film superconducting-insulating-superconducting (SIS) multilayer structures to effectively magnetically screen a bulk superconducting layer such that it can operate at higher field gradients before suffering critically detrimental SRF losses. This dissertation focuses on the production and characterization of thin film superconductors for such SIS layers for radio-frequency applications.
Author : Matthew C. Burton
Release : 2017
Genre : Thin films
Kind : eBook
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Book Synopsis Superconducting Thin Films for the Enhancement of Superconducting Radio Frequency Accelerator Cavities by : Matthew C. Burton
Download or read book Superconducting Thin Films for the Enhancement of Superconducting Radio Frequency Accelerator Cavities written by Matthew C. Burton. This book was released on 2017. Available in PDF, EPUB and Kindle. Book excerpt: Bulk niobium (Nb) superconducting radio frequency (SRF) cavities are currently the preferred method for acceleration of charged particles at accelerating facilities around the world. However, bulk Nb cavities have poor thermal conductance, impose material and design restrictions on other components of a particle accelerator, have low reproducibility and are approaching the fundamental material-dependent accelerating field limit of approximately 50MV/m. Since the SRF phenomena occurs at surfaces within a shallow depth of ~1 μm, a proposed solution to this problem has been to utilize thin film technology to deposit superconducting thin films on the interior of cavities to engineer the active SRF surface in order to achieve cavities with enhanced properties and performance. Two proposed thin film applications for SRF cavities are: 1) Nb thin films coated on bulk cavities made of suitable castable metals (such as copper or aluminum) and 2) multilayer films designed to increase the accelerating gradient and performance of SRF cavities. While Nb thin films on copper (Cu) cavities have been attempted in the past using DC magnetron sputtering (DCMS), such cavities have never performed at the bulk Nb level. However, new energetic condensation techniques for film deposition, such as High Power Impulse Magnetron Sputtering (HiPIMS), offer the opportunity to create suitably thick Nb films with improved density, microstructure and adhesion compared to traditional DCMS. Clearly use of such novel technique requires fundamental studies to assess surface evolution and growth modes during deposition and resulting microstructure and surface morphology and the correlation with RF superconducting properties. Here we present detailed structure-property correlative research studies done on Nb/Cu thin films and NbN- and NbTiN-based multilayers made using HiPIMS and DCMS, respectively.
Author : R.D. McConnell
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 457/5 ( reviews)
Book Synopsis Science and Technology of Thin Film Superconductors 2 by : R.D. McConnell
Download or read book Science and Technology of Thin Film Superconductors 2 written by R.D. McConnell. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: This conference is the second on the Science and Technology of Thin Film Superconductors. It proved to be an excellent forum for these specialists in thin film superconductivity. The conference, held April 30-May 4, 1990, in Denver, Colorado, hosted 170 researchers from 17 countries. The response to the conference again emphasized the need for a meeting devoted to the science and technology of thin film superconductors. The breadth of artic1es and advances made in this technology since the first conference in November 1988, reflect on the maturity of the topic. These proceedings contain artic1es on deposition methods by sputtering, e1ectron beam evaporation, resistive evaporation, laser ablation, chemical vapor deposition and electrodeposition, and on other studies related to substrates, thermodynamics of formation, grain boundaries and weak links, characterization, and some practical applications. The program committee was pleased with the quality of the publications and contributed articles. This conference was highlighted by a fuU day dedicated to presentations from the federallaboratories, discussing a wide range of topics on the fabrication, characterization, and theory of high-temperature superconductor thin films. Other highlights at the conference dealt with (1) critical parameters or problems in measuring critical current density and other important parameters, and (2) problems of scale-up, reproducibility, and amenability to device fabrication. It became evident from the presentations that three issues were developing into critical issues for the ultimate practical application of high temperature superconductor thin films.
