Comparison Between ${\hbox {Nb}}_{3}{\hbox {Al}}$ and ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Strands and Cables for High Field Accelerator Magnets

The Nb
₃
Al small racetrack magnet, SR07, has been successfully built and tested to its short sample limit beyond 10 Tesla without any training. Thus the practical application of Nb
₃
Al strands for high field accelerator magnets is established. The characteristics of the representative F4 strand and cable, are compared with the typical Nb
₃
Sn strand and cable. It is represented by the OST high current RRP Nb
₃
Sn strand with 108/127 configuration. The effects of Rutherford cabling to both type strands are explained and the inherent problem of the Nb
₃
Sn strand is discussed. Also the test results of two representative small racetrack magnets are compared from the stand point of Ic values, and training. The maximum current density of the Nb
₃
Al strands is still smaller than that of the Nb
₃
Sn strands, but if we take into account of the stress-strain characteristics, Nb
₃
Al strands become somewhat favorable in some applications.