Jiang Fan, Peng Tao, Xiao Houxiu, Zhao Jianlong, Pan Yuan, Herlach Fritz, Li Liang
Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, China.
Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
Rev Sci Instrum. 2014 Apr;85(4):045106. doi: 10.1063/1.4870410.
An innovative method for generating a flat-top pulsed magnetic field by means of capacitor banks is developed at the Wuhan National High Magnetic Field Center (WHMFC). The system consists of two capacitor banks as they are normally used to generate a pulsed field. The two discharge circuits (the magnet circuit and the auxiliary circuit) are coupled by a pulse transformer such that the electromotive force (EMF) induced via the transformer in the magnet circuit containing the magnet coil is opposed to the EMF of the capacitor bank. At a certain point before the current pulse in the coil reaches its peak, the auxiliary circuit is triggered. With optimized parameters for charging voltage and trigger delay, the current in the magnet circuit can be approximately kept constant to obtain a flat-top. A prototype was developed at the WHMFC; the magnet circuit was energized by seven 1 MJ (3.2 mF/25 kV) capacitor modules and the auxiliary circuit by four 1 MJ modules. Fields up to 41 T with 6 ms flat-top have been obtained with a conventional user magnet used at the WHMFC.
武汉国家高磁场中心（WHMFC）开发了一种利用电容器组产生平顶脉冲磁场的创新方法。该系统由两个电容器组组成，因为它们通常用于产生脉冲场。两个放电电路（磁体电路和辅助电路）通过脉冲变压器耦合，使得在包含磁体线圈的磁体电路中通过变压器感应的电动势（EMF）与电容器组的EMF相反。在磁体线圈中的电流脉冲达到其峰值之前的某个时刻，触发辅助电路。通过优化充电电压和触发延迟的参数，可以使磁体电路中的电流大致保持恒定以获得平顶。WHMFC开发了一个原型；磁体电路由七个1 MJ（3.2 mF/25 kV）电容器模块供电，辅助电路由四个1 MJ模块供电。使用WHMFC的传统用户磁体已获得高达41 T且平顶持续时间为6 ms的磁场。
