用于快脉冲超导磁铁的液氦内冷电缆的设计（英文）  

Design of a liquid helium inner cooling cable for fast cycled superconducting magnet

作　　者：陈玉泉[1,2] 马力祯[1] 于海燕[1] 吴巍[1] 张晓鹰[1] 梅恩铭 王庆相[3] 

机构地区：[1]中国科学院近代物理研究所核科学与技术,兰州730000 [2]中国科学院大学,北京100049 [3]西部超导材料科技股份有限公司,西安710018

出　　处：《低温与超导》2015年第8期27-31,共5页Cryogenics and Superconductivity

摘　　要：中科院近代物理所提出的强流重离子加速器装置将使用快脉冲超导磁铁技术。为了获得快脉冲磁铁运行的稳定性,研制了适用于快脉冲运行的液氦内冷电缆。该电缆采用超临界氦进行迫流冷却,具有交流损耗低、所用液氦少和冷却效率高的特点,是研制快脉冲超导磁铁的关键技术之一。文中主要介绍电缆的设计和交流损耗并简单描述电缆的加工。用于绞缆的超导线材的性能决定了电缆的性能,因此首先进行超导线的研制。通过研制三种不同基体(纯铜基、铜镍基和铜锰基)的超导线材,以获取低损耗和高临界电流的超导线,进而得到运行稳定性高的电缆。当背景磁场变化为0T-3T-0T时,测得三种线材的磁滞损耗分别为29.7m J/cm3,18.8m J/cm3和26m J/cm3。超导线的耦合损耗很大程度上取决于横向电阻率的大小,相比纯铜基的线材铜镍基和铜锰基体的横向电阻率较大,因此耦合损耗小。在4.2K温度时不同磁场下铜基线的临界电流要高于另外两种线材,但铜锰基体线材的临界电流要略高于铜镍基线材。通过比较三种线材的性能,选用铜锰基体线材进行绞缆较为适合。Fast cycled superconducting magnets will be used in the booster synchrotron ring of the HIAF （ High Intensity heavy ion Accelerator Facility） proposed by the Institute of Modern Physics. One of the key technologies of building fast cycled superconducting magnets is the design and the assembling of the liquid helium inner cooling cable. Forced - flow super- critical helium cooling method was used to cool the inner cable, featuring low cable AC loss, low liquid helium supply and high cooling efficiency. In this paper we introduced the design, the AC losses and the manufacture of the cable. We discussed the principle of the strand AC losses and mathematically estimated the losses. In order to obtain low loss cable, we developed three types of strands ： copper matrix wire, Cu - Ni matrix wire and Cu - Mn alloy matrix wire. The measured hysteresis losses of these three types of strands with the magnetic field varying from 0T to 3T are 29.7mJ/cm^3 ,18.8mJ/cm^3 and 26mJ/cm^3 per cycle, respectively. At 4.2K the critical current of copper matrix wire is higher than the other two wires when the magnetic field is from 2.0T to 5.0T. Furthermore, the critical current of Cu - Mn matrix wire is slightly higher than that of Cu - Ni matrix wire. We recommend the Cu - Ni matrix wire as the liquid helium inner cooling cable because of its lower AC loss.

关 键 词：快脉冲超导磁铁 液氦内冷电缆 迫流冷却 交流损耗 

分 类 号：TM246[一般工业技术—材料科学与工程]