Evolution of magnetically rotating arc into large area arc plasma  

作　　者：王城 李皖皖 张晓宁 査俊 夏维东 

机构地区：[1]Department of Thermal Science and Energy Engineering,University of Science and Technology,Hefei [2]Hefei General Machinery Research Institute

出　　处：《Chinese Physics B》2015年第6期429-432,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11035005,11475174,and 50876101);the Science Instrument Foundation of the Chinese Academy of Sciences(Grant No.Y201162)

摘　　要：An arc channel tends to shrink due to its conductivity increasing with the increase of temperature. In this study, to generate large area arc plasma, we construct a magnetically rotating arc plasma generator, which mainly consists of a lanthanide tungsten cathode （13 mm in diameter）, a concentric cylindrical graphite anode chamber （60 nun in diameter） and a solenoid coil for producing an axial magnet field. By controlling the cold gas flow, the magnetically rotating arc evolves from constricted mode to diffuse mode, which almost fills the whole arc chamber cross section. Results show that the diffuse arc plasma has better uniformity and stability. The formation mechanism of large area arc plasma is discussed in this paper.An arc channel tends to shrink due to its conductivity increasing with the increase of temperature. In this study, to generate large area arc plasma, we construct a magnetically rotating arc plasma generator, which mainly consists of a lanthanide tungsten cathode （13 mm in diameter）, a concentric cylindrical graphite anode chamber （60 nun in diameter） and a solenoid coil for producing an axial magnet field. By controlling the cold gas flow, the magnetically rotating arc evolves from constricted mode to diffuse mode, which almost fills the whole arc chamber cross section. Results show that the diffuse arc plasma has better uniformity and stability. The formation mechanism of large area arc plasma is discussed in this paper.

关 键 词：magnetically rotating arc diffuse arc dispersed arc 

分 类 号：O53[理学—等离子体物理]