Experimental investigation on the current of cathode spot of vacuum arc in axial magnetic fields

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) Pub Date : 2016-09-01 DOI:10.1109/DEIV.2016.7748716

Bingzhou Wu, Z. Shi, Cong Wang, S. Jia, Lijun Wang

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引用次数: 2

Abstract

The splitting and threshold currents (I_s and I_thr, respectively) carried by a single cathode spot of vacuum arcs under the influence of an external axial magnetic field (AMF) up to 220mT are investigated experimentally. Experiments are conducted with OFHC copper and CuCr25 butt electrodes in a demountable vacuum chamber. The electrode separation is fixed at 6 mm. The spots are photographed using a high-speed framing camera with an exposure time of 2 μs. The uniform AMF (B_n) is applied by means of Nd-Fe-B permanent magnets placed symmetrically inside the chamber. It is found that for either cathode material, with increasing B_n, the splitting current I_s initially (0 ≤ B_n ≤ 20 mT) declines rapidly. It then remains basically constant. For both cathode materials, the threshold current I_thr exhibits a similar trend to the splitting current I_s. A possible explanation is proposed to account for the above results.

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轴向磁场下真空电弧阴极点电流的实验研究

实验研究了在220mT外轴向磁场(AMF)作用下，真空电弧单阴极点所携带的劈裂电流和阈值电流(分别为Is和Ithr)。在可拆卸的真空室中用OFHC铜和CuCr25对接电极进行了实验。电极间距固定在6mm。使用曝光时间为2 μs的高速分幅相机拍摄斑点。均匀AMF (Bn)是通过在腔内对称放置Nd-Fe-B永磁体来施加的。结果表明，无论哪种正极材料，随着Bn的增加，初始分裂电流is(0≤Bn≤20mt)迅速下降。然后基本保持不变。对于两种正极材料，阈值电流Ithr表现出与分裂电流Is相似的趋势。对上述结果提出了一种可能的解释。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

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