Download or read book The Ultrahigh Vacuum Heat Treatment and Superconducting Properties of Niobium written by John Alexander Timoshenko and published by . This book was released on 1964 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanical Properties of High Purity Niobium Novel Measurements written by Ganapati Myneni and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the procedures to improve the performance of superconducting niobium cavities is a heat treatment for several hours in an ultrahigh vacuum at temperatures between 800C and 1400C for hydrogen degassing or post-purification, respectively. However, it was recently observed with Spallation Neutron Source Project (SNS) prototype cavities, that a heat treatment at 800 C for even 1 hour degraded the mechanical properties of RRR niobium, in particular the yield strength. This lower strength resulted in cavity deformations during handling thus affecting both their resonant frequency and field profile. In addition to lowering the yield strength, it was observed in some lots of material that the Young's modulus was also apparently reduced by a factor of 2 as a result of the hydrogen outgassing at 800 C. Surprisingly, material received at other national laboratories exhibited similar anomalous behavior even without any heat treatments in vacuum. Based on these observations a multi-institutional collaborative basic research activity on high RRR niobium (determination of Nb yield strength as a function of grain size, work hardening, chemical composition, and heat treatment temperature) has been initiated by JLAB to gain a better understanding of the material properties affecting the mechanical behavior In this contribution, a brief review of the measurements at JLAB, at the Materials Science and Engineering Department of the University of Virginia, at the Analytical Chemistry and Metallurgy Divisions of the National Institute of Standard and Technology, Gaithersburg and in the Department of Physics, SUNY, Albany are presented. The measurements include yield strength, hardness, ultrasonic velocity, crystallographic structure, microstructure, determination of interstitial contents using internal friction; particular emphasis is placed on determining the hydrogen concentration in the niobium via Cold Neutron Prompt Gamma-Ray Activation Analysis and Neutron Incoherent Scattering and to measure hydrogen depth profiles near surface regions by Nuclear Reactions Analysis.

Download or read book Improvement and Protection of Niobium Surface Superconductivity by Atomic Layer Deposition and Heat Treatment written by and published by . This book was released on 2008 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method to treat the surface of Nb is described, which potentially can improve the performance of superconducting rf cavities. We present tunneling and x-ray photoemission spectroscopy measurements at the surface of cavity-grade niobium samples coated with a 3 nm alumina overlayer deposited by atomic layer deposition. The coated samples baked in ultrahigh vacuum at low temperature degraded superconducting surface. However, at temperatures above 450 C, the tunneling conductance curves show significant improvements in the superconducting density of states compared with untreated surfaces.

Download or read book Superconducting Properties of Niobium Films written by Wayne R. Hudson and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Niobium Alloys and Compounds written by M. Neuberger and published by Springer Science & Business Media. This book was released on 2013-12-11 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report was prepared by Hughes Aircraft Company, Culver City, California under Contract No. F33615-70-C-1348. The work was administered under the direction of the Air Force Materials Laboratory, Air Force Systems Cornrnand, Wright-Patterson Air Force Base, Ohio, with Mr. B. Emrich, Project Engineer. The Electronic Properties Information Center (EPIC) is a designated inforrnation Analysis Center of the Departrnent of Defense, authorized to provide inforrnation to the entire DoD cornrnunity. The purpose of the Center is to provide a highly competent source of inforrnation and data on the electronic, optical and magnetic properties of materials of value to the Department of Defense. Its major function is to evaluate, compile and publish the experimental data from the world's unclassified literature concerned with the properties of materials. All materials relevant to the field of electronics are within the scope of EPIC: insulators, semiconductors, metals, superconductors, ferrites, ferroelectrics, ferromagnetics, electro luminescents, therrnionic emitters and optical materials. The Center's scope includes inforrnation on over 100 basic properties of materials; information generally regarded as being in the area of devices and/or circuitry is excluded. Grateful acknowledgement is made for the review and comments of Dr. G. D. Cody of RCA Laboratories and Dr. B. W. Roberts of General Electric Co. V CONTENTS Introduction •. . ••••. . . ••••. . . . . . •• 1 Superconductivity Applications •••• 3 Niobium-Hydrogen •. . ••. •. ••. ••. . •• 15 Niobium-Antimony. • . . . • . • • • • . • • . • • .

Download or read book Superconducting Devices Materials written by and published by . This book was released on 1968 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book European Particle Accelerator Conference Epac 94 In 3 Volumes written by Christine Petit-jean-genaz and published by World Scientific. This book was released on 1994-11-26 with total page 2968 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Cryogenic Engineering Materials written by Richard P. Reed and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the Tenth International Cryogenic Materials Conference (ICMC) held in Albuquerque, New Mexico, July 12-16, 1993.

Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 916 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindeks written by and published by . This book was released on 1986 with total page 1204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1972 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Small Business Innovation Research written by DIANE Publishing Company and published by DIANE Publishing. This book was released on 1994 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: