BENDING OF BI(2223)-AG TAPES AT 77 AND 300 K

An experimental study of Bi(2223)-Ag tapes undergoing bending and stra ightening at 300 and 77 K has been performed. The special test equipme nt allows us to measure changes of the critical current in a short ele ment ai the tape during continual decreasing or increasing of the bend ing diameter at both temperatures mentioned above, Comparison of 300 a nd 71 K results shows the effect of the Ag sheath strength on the bend ing sensitivity of Bi(2223)-Ag composite tape, Remarkable lowering of critical current degradation by bending at 77 K was observed, This off ers the possibility of winding small-diameter coils with Bi(2223)-Ag t ape pre-cooled by liquid nitrogen.