AC magnetic losses in Bi-2223/Ag tapes with different aspect ratios

作者：Fang J^*; Luo XM; Chen DX; Collings EW; Lee E; Sumption MD; Alamgir AKM; Yi HP; Fang JG; Gu C; Guo SQ; Liu ML; Xin Y; Han Z

来源：Physica C-Superconductivity and Its Applications, 2004, 412: 1134-1138.

DOI：10.1016/j.physc.2004.01.136

• magnetic loss
• Bi(2223)/Ag tapes
• aspect ratio
• full penetration field
• decay time constant of coupling current

AC losses in multi-filamentary tapes depend on various parameters. Among them, the overall tape width and thickness are expected to have ail important influence. In order to study this geometrical effect, five Bi-2223/Ag tapes with different aspect ratios from 5 to 26 have been prepared. AC losses have been measured at 77 K when a perpendicular AC magnetic field is applied. It has been found that at any frequencies the magnetic loss per cycle increases as the aspect ratio increases. For AC magnetic loss, with increasing frequency from 3 to 9000 Hz the losses as a function of frequency show a maximum if the field amplitude is much less than the full penetration field or increase continuously if the field amplitude is larger.

• 出版日期2004-10
• 单位清华大学