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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (2): 25402-025402.doi: 10.1088/2058-6272/aa8a30

• 低温等离子体 • 上一篇    下一篇

Control of vacuum arc source cathode spots contraction motion by changing electromagnetic field

  

  • 收稿日期:2017-05-26 出版日期:2018-01-11 发布日期:2017-09-04

Control of vacuum arc source cathode spots contraction motion by changing electromagnetic field

Xin SONG (宋鑫), Qing WANG (王庆)1, Zeng LIN (蔺增), Puhui ZHANG (张谱辉) and Shuhao WANG (王书豪)   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110004, People’s Republic of China
  • Received:2017-05-26 Online:2018-01-11 Published:2017-09-04

Abstract:

This paper investigates the magnetic field component impact on cathode spots motion trajectory and the mechanism of periodic contraction. Electromagnetic coils and permanent magnets were installed at the different sides of cathode surface, the photographs of cathode spots motion trajectory were captured by a camera. Increasing the number of magnets and decreasing the distance between magnets and cathode both lead to enhancing cathode spots motion velocity. Radii of cathode spots trajectory decrease gradually with the increasing of electromagnetic coil’s current, from 40 mm at 0 A to 10 mm at 2.7 A. Parallel magnetic field component intensity influence the speed of cathode spots rotate motion, and perpendicular magnetic field component drives spots drift in the radial direction. Cathode spot’s radial drift is controlled by changing the location of the ‘zero line’ where perpendicular magnetic component shifts direction and the radius of cathode spots trajectory almost equal to ‘zero line’.

Key words: magnetic field component, cathode spots motion, velocity, drift, zero line

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