Title :
Normal zone propagation and quench characteristics of Nb3Sn wires with jelly-roll and in-situ processed CuNb reinforcements
Author :
Murase, Satoru ; Murakami, Tomoyuki ; Seto, Toshiyuki ; Shimamoto, Susumu ; Awaji, Satoshi ; Watanabe, Kazuo ; Saito, Takashi ; Iwaki, Genzo ; Meguro, Shin-ichiro
Author_Institution :
Graduate Sch. of Eng., Tohoku Univ., Sendai, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
The stability of three types of CuNb reinforced Nb3Sn wires has been experimentally studied in order to clarify effects of critical current density, Jc, and Nb fraction in CuNb reinforcements. The stabilities, i.e., minimum quench energy, MQE, and normal zone propagation velocity, ”p, were evaluated for sample wires having low Jc and low Nb fraction (A) and high Jc and low Nb fraction (B) with in-situ processed CuNb reinforcement and high Jc and high Nb fraction with jelly roll processed CuNb reinforcement (C). The MQE decreased with increase in transport current density normalized by Jc, critical generation density, and Nb fraction, on the other hand, νp increased with increasing the transport current density, regardless of Nb fraction. We obtained basic data for the design of magnets having both a high stability and mechanical strength
Keywords :
copper alloys; critical current density (superconductivity); multifilamentary superconductors; niobium alloys; quenching (thermal); tin alloys; type II superconductors; CuNb reinforced Nb3Sn wires; Nb fraction; Nb3Sn-CuNb; critical current density; jelly roll processing; magnet design; mechanical strength; minimum quench energy; normal zone propagation; Critical current density; Current density; Magnetic field measurement; Niobium; Niobium-tin; Stability; Superconducting magnets; Telephony; Tin; Wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
