低剩磁磁芯自复位能力研究
Research of self-restoreation ability of low remanence magnetic cores
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摘要: 在MHz重复频率的高压多脉冲下，如何在脉冲间隔对磁芯进行快复位是高压多脉冲感应加速腔研制的关键问题。对低剩磁磁芯在脉冲励磁后磁通量密度的自恢复能力及其影响因素进行了实验研究和理论分析，证实了利用低剩磁磁芯的自恢复能力来实现在高压多脉冲下重复利用磁芯伏秒值的可能。实验证明：在选用合适的材料及工作电路后，磁芯在脉冲励磁后自复位到剩磁处的时间可小于500 ns，可稳定地工作在MHz重复频率的高压多脉冲环境下。Abstract: Theoretical analysis and experiments have been done to find out the factors which decide the self-restoration ability of low remanence magnetic cores. The results show that in the right working circuit, the cores with appropriate pulse permeability can self-restore to its remanence within 1 s. Two sample cores have been proved to satisfy all the three demands to be cavity cores of a multi-pulse inductive accelerator, i.e., the cores’ self-restoration time is less than 1 μs, its pulse average permeability is greater than 300 and flux density change area is greater than 0.7 T. The magnetic cores restoration problem in MHz repeat frequency high voltage multi-pulse is likely to be solved by choosing the right material of the cavity cores of the multi-pulse inductive accelerator．
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