Test Results of a Nb3Al/Nb3Sn Subscale Magnet for Accelerator Application
Test Results of a Nb3Al/Nb3Sn Subscale Magnet for Accelerator Application
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DOI：
10.1109/tasc.2015.2390074
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发表时间：
2015-01
影响因子：
1.8
通讯作者：
M. Iio;Qingjin Xu;T. Nakamoto;K. Sasaki;T. Ogitsu;A. Yamamoto;N. Kimura;K. Tsuchiya;M. Sugano
中科院分区：
文献类型：
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作者：
M. Iio;Qingjin Xu;T. Nakamoto;K. Sasaki;T. Ogitsu;A. Yamamoto;N. Kimura;K. Tsuchiya;M. Sugano
高能加速器研究组织（KEK）一直在开发Nb 3Al和Nb 3Sn亚尺度磁体，以建立高场加速器磁体的技术。开发目标是Nb 3Al电缆的可行性论证和Nb 3Al超导体磁体制造的技术获取。KEK与国家材料科学研究所和费米国家加速器实验室合作，开发了两种带有卢瑟福型电缆的双饼跑道线圈，该电缆由28根经过快速加热、淬火和转变处理的Nb 3Al线组成。磁体被制造成在最小间隙共线圈配置中有效地产生高磁场，其中两个Nb 3Al线圈夹在由劳伦斯伯克利国家实验室生产的两个Nb 3Sn线圈之间。基于壳的结构和“囊和键”技术已被用于在磁体组装和冷却期间调节线圈预应力。在2014年6月进行的磁体在4.5K下的第一次励磁试验中，Nb 3Sn线圈的最高失超电流，即，在40 A/s下达到9667 A，对应于Nb 3Sn线圈中的9.0 T和Nb 3Al线圈中的8.2 T。研究了磁体的失超特性。
The High Energy Accelerator Research Organization (KEK) has been developing a Nb3Al and Nb3Sn subscale magnet to establish the technology for a high-field accelerator magnet. The development goals are a feasibility demonstration for a Nb3Al cable and the technology acquisition of magnet fabrication with Nb3Al superconductors. KEK developed two double-pancake racetrack coils with Rutherford-type cables composed of 28 Nb3Al wires processed by rapid heating, quenching, and transformation in collaboration with the National Institute for Materials Science and the Fermi National Accelerator Laboratory. The magnet was fabricated to efficiently generate a high magnetic field in a minimum-gap common-coil configuration with two Nb3Al coils sandwiched between two Nb3Sn coils produced by the Lawrence Berkeley National Laboratory. A shell-based structure and a “bladder and key” technique have been used for adjusting coil prestress during both the magnet assembly and the cool down. In the first excitation test of the magnet at 4.5 K performed in June 2014, the highest quench current of the Nb3Sn coil, i.e., 9667 A, was reached at 40 A/s corresponding to 9.0 T in the Nb3Sn coil and 8.2 T in the Nb3Al coil. The quench characteristics of the magnet were studied.