Analysis of the influence structural defects on the critical current of the HTc superconducting tapes.

In the paper it is theoretically analysed the influence on the critical current phenomena of the HTc superconducting tapes, of the structural defects created in HTc superconductors, especially during the heavy ions irradiation arising at the work of the superconducting magnets in the modern nuclear accelerators but also at the mechanical bending strain process. The losses generated then during the pulsed current flow through the superconducting current leads, supplying accelerators are calculated as the function of the time and current. Attention will be devoted here to the analysis of the hysteresis effects. The influence of the nano-sized structural defects on the current-voltage characteristics of the HTc superconducting materials is investigated basing on the model of interaction magnetic pancake type vortices with nano-sized defects as the function of the strength of this interaction, leading to various depths of vortices anchoring in the initial state.

本文从理论层面分析了高温超导（HTc）超导体中形成的结构缺陷对高温超导带材临界电流现象的影响，这类缺陷尤其产生于现代核加速器中超导磁体运行时的重离子辐照过程，以及机械弯曲应变过程。本文还计算了为加速器供电的超导电流引线在脉冲电流导通期间产生的损耗，并将其表征为时间与电流的函数。本文将重点展开磁滞效应的分析。本研究以磁饼状涡旋与纳米级缺陷的相互作用模型为基础，以该相互作用强度为变量，探究了纳米级结构缺陷对高温超导材料电流-电压特性的影响，该模型可揭示初始状态下涡旋钉扎的不同深度。