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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (3): 035402.doi: 10.1088/2058-6272/aa997f

• Low Temperature Plasma • Previous Articles     Next Articles

Self-organized pattern on the surface of a metal anode in low-pressure DC discharge

Yaqi YANG (杨亚奇) and Weiguo LI (李卫国)   

  1. College of Electrical Engineering, North China Electric Power University, Beijing 102206, People’s Republic of China
  • Received:2017-08-25 Published:2017-11-09
  • Supported by:

    This work is supported by National Natural Science Foundation of China (Grant No. 51277063).

Abstract:

Self-organization phenomena on the surface of a metal electrode in low-pressure DC discharge is studied. In this paper, we carry out laboratory investigations of self-organization in a low-pressure test platform for 100–200 mm rod-plane gaps with a needle tip, conical tip and hemispherical tip within 1–10 kPa. The factors influencing the pattern profile are the pressure value, gap length and shape of the electrode, and a variety of pattern structures are observed by changing these factors. With increasing pressure, first the pattern diameter increases and then decreases. With the needle tip, layer structure, single-ring structure and double-ring structure are displayed successively with increasing pressure. With the conical tip, the ring-like structure gradually forms separate spots with increasing pressure. With the hemispherical tip, there are anode spots inside the ring structure. With the increase of gap length, the diameter of the self-organized pattern increases and the profile of the pattern changes. The development process of the pattern contains three key stages: pattern enlargement, pattern stabilization and pattern shrink.

Key words: self-organized pattern, low pressure, DC voltage, metal anode, pattern profile