EFFECTS OF THE CURRENT REDISTRIBUTION WITHIN NB3SN COMPACTED-STRAND CABLE ON ITS STABILITY

The effects of current redistribution on the stability have been studi ed using two kinds of Nb3Sn compacted-strand cables with chrome coatin g and without any coating, The minimum quench energy (MQE) has been me asured in various external magnetic field and with various transport c urrent, The MQE of the cable with chrome coating was slightly larger t han that of the cable without coating when the transport/critical curr ent ratio, I/I-c, is small, The effects of the different surface condi tion of the strands on the stability becomes smaller, when the transpo rt current approaches the critical current. The normal zone propagatio n process of these cables were also different, The initiation of the n ormal zone propagation in the cable without coating was slower than th at in the cable with coating.