Stability of Nb3Sn wires with CuNb reinforcing stabilizer on cryocooled superconducting magnet

The stability of advanced Nb3Sn wires with CuNb reinforcing stabilizer cool ed by refrigerator is studied in order to obtain data base for the future c ompact design of cryocooled superconducting magnets. The experiments on the critical currents, the minimum quench energy and the normal zone propagati on velocity for a cryocooled sample-coil of the CuNb/Nb3Sn wires are carrie d out under the condition of the magnetic field up to 15 T at temperatures ranging from 4 K to 10 K. Added to this, we make a comparison between the s tability of CuNb/Nb3Sn and Cu/Nb3Sn wires in the cryocooling case. It is co ncluded from this experimental result there are the slight differences betw een two kinds of wires, which have to be considered for cryocooled magnet d esign.