Development of 15 T Cryogen-Free Superconducting Magnets
Development of 15 T Cryogen-Free Superconducting Magnets
复制标题
15T无制冷剂超导磁体的研制
DOI：
10.1109/tasc.2006.871282
复制
发表时间：
2006
影响因子：
1.8
通讯作者：
K. Okuno
中科院分区：
文献类型：
--
作者：
R. Hirose;S. Hayashi;S. Fukumizu;Y. Muroo;H. Miyata;Y. Okui;A. Itoki;T. Kamikado;O. Ozaki;Y. Nunoya;K. Okuno
与传统的液氦冷却的超导磁体相比，无致冷剂超导磁体由于其操作简单而越来越受欢迎。然而，对于更高的磁场，例如大于14 T的磁场，无致冷剂磁体还没有变得流行，因为由于临界电流在更高的磁场和更高的温度下显著降低，因此难以设计和制造。我们已经开发了两种类型的15 T无制冷剂超导磁体，这将是其中的最高场磁体在操作中作为无制冷剂与GM制冷机。一个磁体具有52 mm的室温孔，其总体尺寸为直径820 mm和高度680 mm。该磁体被设计成操作和安装都简单。因此，磁体用单个1W GM制冷机冷却。此外，所有线圈串联连接，并由单个电源充电。磁体在30分钟内成功充电至15 T，然后缓慢充电至16 T而不淬灭。另一个磁体具有170 mm的室温孔，其总体尺寸为直径980 mm和高度1015 mm。该磁体设计为与外径为168 mm的温度控制样品低温恒温器一起使用。磁体用四个1 W GM低温冷却器冷却，并用单个电源充电。磁体在90分钟内成功充电至15 T。这两种磁体将使高磁场的研究或应用非常容易操作
Cryogen-free superconducting magnets are becoming popular due to their simple operation compared with the conventional liquid Helium cooled magnet. However, for higher fields such as those greater than 14 T, the cryogen-free magnet has not become popular yet, because it is difficult to design and manufacture since the critical current is markedly reduced at higher fields and higher temperatures. We have developed two types of 15 T cryogen-free superconducting magnets, which will be among the highest field magnets in operation as cryogen-free with a GM cryocooler. One magnet has a 52 mm room temperature bore with overall dimensions of 820 mm in diameter and 680 mm in height. This magnet is designed so as to be simple in both operation and installation. Therefore, the magnet is cooled with a single 1 W GM cryocooler. Also, all coils are connected in series and charged with a single power supply. The magnet was successfully charged up to 15 T in 30 minutes and then charged slowly to 16 T without quench. The other magnet has a 170 mm room temperature bore with overall dimensions of 980 mm in diameter and 1015 mm in height. This magnet is designed so as to be used with temperature controlled sample cryostats with an outer diameter of 168 mm. The magnet is cooled with four 1 W GM cryocoolers and charged with a single power supply. The magnet was successfully charged up to 15 T in 90 minutes. Both magnets will enable high magnetic field research or application with very easy operation