Heat conduction and thermal stabilization in YBCO tape

Bulletin of materials science

Ziauddin Khan¹  Subrata Pradhan¹  Irfan Ahmad² 

[1] Institute for Plasma Research, Gandhinagar 382 428, India$$Institute for Plasma Research, Gandhinagar 382 428, IndiaInstitute for Plasma Research, Gandhinagar 382 428, India$$;Shibli National College, Azamgarh 276 131, India$$Shibli National College, Azamgarh 276 131, IndiaShibli National College, Azamgarh 276 131, India$$

关键词: YBCO;    conduction-cooled;    quench;    hot spot.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Yttrium barium copper oxide (YBCO) coated conductors are widely used in the conduction-cooled superconducting magnets with rapid development in refrigeration technologies at present. `Quench’ is a state that refers to the irreversible and uncontrolled superconductor to resistive transitions in the superconductor. The propagation of ‘quench’ or `normal zone’ has different characteristics in these high temperature superconductors (HTS) compared to low temperature superconductors. The superconductor to normal index, known as `�?��? is much flatter in HTS. The hot spot emerging in local region due to quench and non-uniform critical current may cause permanent damage to whole HTS tape and hence the magnet winding pack. Thus it is necessary to determine the temperature profile along the length of HTS tape under a given energy (joule heating) such that propagation of the hot spot developed locally can be prevented early. In this study, a one dimensional, time dependent heat diffusion equation with appropriate boundary conditions are used to describe the consequences of the normal zone propagation resulting in the temperature diffusion in a HTS tape. The results demonstrate the necessity of adequate cooling of the edges of the flat HTS tapes to prevent irreversible normal zone transitions.

【 授权许可】

Unknown