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

• 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

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 Thompson本项目将研究裂变诱导的柱状缺陷对各种高Tc材料中的涡旋钉扎的影响，例如实际的Pb掺杂Bi-2223/Ag复合线或带，Hg基铜酸盐外延膜和块体材料，以及Bi-2212单晶。我们的目标是开发实用的方法来提高临界电流密度，Jc，在这些材料中，通过故意引入扩展缺陷与GeV范围内的光粒子照射，有可能扩大到大型预制结构。该项目结合了田纳西大学、诺克斯维尔和IBM T. J.沃森研究中心，在超导体研究和各种磁性和传输方法方面具有专业知识。该项目还利用了洛斯阿拉莫斯国家实验室的专门知识和辐照设施以及美国超导公司的电线和磁带制造。 高温超导体的大规模应用尚不可能，这是由于难以制造能够承载大电流的线或带，即具有在高磁场中可持续的大临界电流密度Jc。 这些问题与电流“涡旋”的耗散运动有关，电流“涡旋”是高温超导材料的固有特性， 磁场的存在。 该项目采用辐射诱导损伤中心或柱状缺陷，其作用是“钉扎”涡流，使其无法移动，从而大大提高了材料的载流性能。 该项目结合了田纳西大学、诺克斯维尔和IBM T. J.沃森研究中心，在超导体研究和各种磁性和传输方法方面具有专业知识。 的 项目 此外，该公司还利用洛斯阿拉莫斯国家实验室的专业知识和辐照设施，以及美国超导公司的电线和磁带制造技术。 ***