Cathode spot motion in vacuum arc of zinc cathode under oxygen gas flow

被引：12

作者：

Miyano, R ^{[1
]}

Fujimura, Y ^{[1
]}

Takikawa, H ^{[1
]}

Sakakibara, T ^{[1
]}

Nagao, M ^{[1
]}

机构：

[1] Toyohashi Univ Technol, Aichi 4418580, Japan

来源：

IEEE TRANSACTIONS ON PLASMA SCIENCE | 2001年 / 29卷 / 05期

关键词：

ambient oxygen; cathode spot; distribution of magnetic flux density; multiplicity; pressure dependence; retrograde velocity; zinc cathode;

D O I：

10.1109/27.964460

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Magnetically steered cathode spot(s) of a vacuum are with a zinc (Zn) cathode was(were) observed using a high-speed video camera. The camera can take 4500 frames per second of 256 x 256 pixels. The transverse magnetic flux density for steering the cathode spot was 1.0 and 5.5 mT at the bottom of the cathode (64 mm in diameter) shoulder. The arc was operated at an are current of dc 30 A and O-2 flow rate of 40 ml/min. The pressure was varied from 0.1 Pa to 5.0 Pa. The principal results obtained in the present study were as follows. The cathode spots were driven in the retrograde direction. When a strong magnet was used, the number of the cathode spots was smaller, the cathode spots revolved at the outer region of the cathode surface more of the time, and the velocity of the cathode spots was higher than when a weak magnet was used. The velocity of the cathode spots increased as the pressure increased.

引用

页码：713 / 717

页数：5

共 11 条

[1]

Boxman R. L., 1995, HDB VACUUM ARC SCI T

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