Feasibility Study of ${\rm Nb}_{3}{\rm Al}$ Rutherford Cable for High Field Accelerator Magnet Application
Feasibility Study of ${\rm Nb}_{3}{\rm Al}$ Rutherford Cable for High Field Accelerator Magnet Application
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DOI：
10.1109/tasc.2007.898202
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发表时间：
2007-06
影响因子：
1.8
通讯作者：
R. Yamada;A. Kikuchi;G. Ambrosio;N. Andreev;E. Barzi;C. Cooper;S. Feher;V. Kashikin;M. Lamm;I. Novitski;T. Takeuchi;M. Tartaglia;D. Turrioni;A. Verweij;M. Wake;G. Willering;A. Zlobin
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文献类型：
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作者：
R. Yamada;A. Kikuchi;G. Ambrosio;N. Andreev;E. Barzi;C. Cooper;S. Feher;V. Kashikin;M. Lamm;I. Novitski;T. Takeuchi;M. Tartaglia;D. Turrioni;A. Verweij;M. Wake;G. Willering;A. Zlobin
费米实验室正在与NIMS合作，对用于高场加速器磁体的铜稳定Nb 3Al股线和卢瑟福电缆进行可行性研究。在日本的NIMS开发和制造的Nb 3Al股线在4.2K下在15特斯拉下具有约844 A/mm 2的非铜Jc，铜含量为50%，并且细丝尺寸为约50微米。制造并测试了具有27根直径为1.03 mm的Nb 3Al股线的卢瑟福电缆。利用大电流Transformer对一根短电缆进行了失超试验，以研究其在只有自身磁场的情况下的稳定性。一对2米长的Nb 3Al电缆在CERN进行了广泛的测试，在4.3和1.9 K高达11特斯拉，包括其自身的领域与20.2 kA的高传输电流。在低场测试中，我们观察到拼接附近和中心区域的不稳定性。这与磁通跳跃行为有关，因为Nb 3Al股线中过量的Nb。Nb_3Al中的Nb有可能在低于2特斯拉的场区引起不稳定性。我们需要进一步调查这个问题。在8特斯拉以上，我们观察到临界表面附近的淬火在快速斜坡率从1000到3000 A/秒，淬火速度超过100米/秒。使用14米的卢瑟福电缆制作了一个小型跑道磁铁，并成功测试了高达21.8 kA，对应于8.7 T。
Feasibility study of Cu stabilized Nb3Al strand and Rutherford cable for the application to high field accelerator magnets are being done at Fermilab in collaboration with NIMS. The Nb3Al strand, which was developed and manufactured at NIMS in Japan, has a non-copper Jc of about 844 A/mm2 at 15 Tesla at 4.2 K, a copper content of 50%, and filament size of about 50 microns. Rutherford cables with 27 Nb3Al strands of 1.03 mm diameter were fabricated and tested. Quench tests on a short cable were done to study its stability with only its self field, utilizing a high current transformer. A pair of 2 meter long Nb3Al cables was tested extensively at CERN at 4.3 and 1.9 K up to 11 Tesla including its self field with a high transport current of 20.2 kA. In the low field test we observed instability near splices and in the central region. This is related to the flux-jump like behavior, because of excessive amount of Nb in the Nb3Al strand. There is possibility that the Nb in Nb3Al can cause instability below 2 Tesla field regions. We need further investigation on this problem. Above 8 Tesla, we observed quenches near the critical surface at fast ramp rate from 1000 to 3000 A/sec, with quench velocity over 100 m/sec. A small racetrack magnet was made using a 14 m of Rutherford cable and successfully tested up to 21.8 kA, corresponding to 8.7 T.