Current Enhancement by Fission-Induced Columnar Defects in High Temperature Superconductors

高温超导体中裂变引起的柱状缺陷增强电流

基本信息

批准号：
9510731
负责人：
James Thompson
金额：
$ 8万
依托单位：
University of Tennessee Knoxville
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-09-01 至 1998-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9510731&HistoricalAwards=false
关键词：
Current Enhancement Fission Induced Columnar

项目摘要

9510731 Thompson This project will investigate the effect of fission-induced columnar defects on vortex pinning in a variety of high-Tc materials, such as practical Pb-doped Bi-2223/Ag composite wire or tapes, Hg-based cuprate epitaxial films and bulk materials, and Bi-2212 single crystals. The goal is to develop practical ways to enhance the critical current density, Jc, in these materials via deliberate introduction of extended defects with GeV range light particle irradiation, with potential for scale-up to large prefabricated structures. The project incorporates a focused joint effort of groups at the University of Tennessee, Knoxville, and at IBM T. J. Watson Research Center, with demonstrated expertise in studies of superconductors and in various magnetic and transport methods. The project also draws on the expertise and irradiation facilities at Los Alamos National Laboratory and on fabrication of wires and tapes at the American Superconductor Corporation. %%% Large-scale applications of high temperature superconductors are not yet possible due to difficulties in manufacturing wires or tapes capable of carrying large currents, that is, having large critical current densities, Jc, sustainable in high magnetic fields. The problems are related to dissipative motion of current "vortices" which are intrinsic to the high-Tc materials in the presence of magnetic fields. This project employs radiation induced damage centers, or columnar defects, which act to "pin" the vortices so they are unable to move, and, as a result, greatly enhance the current carrying properties of the materials. The project incorporates a focused joint effort of groups at the University of Tennessee, Knoxville, and at IBM T. J. Watson Research Center, with demonstrated expertise in studies of superconductors and in various magnetic and transport methods. The project also draws on t he expertise and irradiation facilities at Los Alamos National Laboratory and on fabrication of wires and tapes at the American Superconductor Corporation. ***

9510731汤普森该项目将研究裂变引起的柱状缺陷对各种高-TC材料的涡旋固定的影响，例如实用的PB型BI-2223/AG复合丝或磁带，基于HG的Cuprate Cuprate Esportagial Espertagial Film和Bulk材料以及BI-2212单晶。目的是通过故意引入具有GEV范围光颗粒辐照的扩展缺陷来开发实用方法来增强关键电流密度JC，在这些材料中，有可能扩展到大型预制结构。该项目结合了田纳西大学，诺克斯维尔大学和IBM T. J. Watson Research Center的集体共同努力，并在超导体研究以及各种磁性和运输方法方面具有专业知识。该项目还借鉴了洛斯阿拉莫斯国家实验室的专业知识和辐照设施，以及在美国超导体公司的电线和磁带制造。由于难以携带大型电流的制造线或磁带，即具有大型临界电流密度，JC在高磁场中可持续发展，因此无法使用高温超导体的大规模应用。这些问题与当前“涡旋”的耗散运动有关，这些运动在存在磁场的情况下与高-TC材料固有。该项目采用辐射诱导的损伤中心或柱状缺陷，这些缺陷作用于“销钉”涡流，因此它们无法移动，因此，它们大大增强了材料的当前携带特性。该项目结合了田纳西大学，诺克斯维尔大学和IBM T. J. Watson Research Center的集体共同努力，并在超导体研究以及各种磁性和运输方法方面具有专业知识。该项目还借鉴了洛斯阿拉莫斯国家实验室的专业知识和辐射设施，以及在美国超导体公司的电线和磁带制造。 ***