Aconduction-cooled superconducting magnet with central field of 10Tand warmbore of 100 mmwas designed based on a Nb3Sn and two NbTi superconducting coils.At the first stage,the NbTi coils havebeen fabricated andtested...Aconduction-cooled superconducting magnet with central field of 10Tand warmbore of 100 mmwas designed based on a Nb3Sn and two NbTi superconducting coils.At the first stage,the NbTi coils havebeen fabricated andtested.Atwo-stage 4 KGifford-McMahon(GM) cryocooler withthe second-stage powerin1W,4.2Kis used to cool the magnet fromroomtemperature to 4 K.The superconducting magnet with thesame power supply has the operating current of 116A.The magnet can be rotated with a support frame to beoperated with either horizontal or vertical position.Apair of Bi-2223 hightemperature superconductingcurrentleads was employedto reduce heat leakage into 4.2Klevel.The NbTi coils reachto the operating current of120Awithout training effect to be observed duringchargingof the magnet during40 minutes chargingtime andgenerate the center field of 6.5T.The training effect inthe NbTi magnet directly cool-down by cryocooler andinter-winding support structure in magnet can be remarkablyimproved.The superconducting magnet has beenstably operatedfor more than 275 hours with 6.5T.In this paper,the detailed design,fabrication,stressanalysis and quench protection characteristics are presented.展开更多
文摘Aconduction-cooled superconducting magnet with central field of 10Tand warmbore of 100 mmwas designed based on a Nb3Sn and two NbTi superconducting coils.At the first stage,the NbTi coils havebeen fabricated andtested.Atwo-stage 4 KGifford-McMahon(GM) cryocooler withthe second-stage powerin1W,4.2Kis used to cool the magnet fromroomtemperature to 4 K.The superconducting magnet with thesame power supply has the operating current of 116A.The magnet can be rotated with a support frame to beoperated with either horizontal or vertical position.Apair of Bi-2223 hightemperature superconductingcurrentleads was employedto reduce heat leakage into 4.2Klevel.The NbTi coils reachto the operating current of120Awithout training effect to be observed duringchargingof the magnet during40 minutes chargingtime andgenerate the center field of 6.5T.The training effect inthe NbTi magnet directly cool-down by cryocooler andinter-winding support structure in magnet can be remarkablyimproved.The superconducting magnet has beenstably operatedfor more than 275 hours with 6.5T.In this paper,the detailed design,fabrication,stressanalysis and quench protection characteristics are presented.
