外横向磁场作用下真空电弧阴极光斑动态的实验研究

Cong Wang, Z. Shi, Bingzhou Wu, S. Jia, Lijun Wang
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引用次数: 2

摘要

实验研究了单阴极光斑在200mT外横磁场(TMF)下的动态特性。本作品采用40A的恒弧电流,只有一个CS。在可拆卸真空室中对Cu和CuCr25对接触点进行了实验。间隙距离固定在4mm。Nd-Fe-B永磁体提供了接触区内均匀常数TMF (Bt)。CS的图像由数字高速相机通过观察窗拍摄,曝光时间为2μs。实验结果表明,在一定的Bt范围内,CS在Cu和CuCr25阴极上逆行运动的速度Vr随外TMF以比例系数Kr线性增加,然后随Bt的进一步增加呈非线性缓慢增加,Cu和CuCr25阴极的比例系数Kr分别约为109 m/(s T)和190 m/(s T)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental investigation on the dynamic of cathode spot of vacuum arc in external transverse magnetic field
In this paper, the dynamic of single cathode spot (CS) in external transverse magnetic field (TMF) up to 200mT is investigated experimentally. The constant arc current of 40A is used in this work, with which there is only one CS. Experiments are conducted with Cu and CuCr25 butt contacts in a demountable vacuum chamber. The gap distance is fixed at 4mm. The uniform constant TMF (Bt) within the inter-contacts region is supplied by Nd-Fe-B permanent magnets. Images of CS are photographed through the observation window by a digital high-speed camera with an exposure time of 2μs. Experimental results show that the velocity Vr of retrograde motion of CS on both Cu and CuCr25 cathode increases linearly with external TMF with a proportional coefficient Kr in a certain range of Bt, and then increases nonlinearly and slowly with further increased of Bt. The proportional coefficients Kr are about 109 m/(s T) and 190 m/(s T) respectively for Cu and CuCr25 cathode.
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