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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (2): 25403-025403.doi: 10.1088/2058-6272/aa89e1

• 低温等离子体 • 上一篇    下一篇

Study of electron-extraction characteristics of an inductively coupled radio-frequency plasma neutralizer

  

  • 收稿日期:2017-07-13 出版日期:2018-01-11 发布日期:2017-09-01

Study of electron-extraction characteristics of an inductively coupled radio-frequency plasma neutralizer

Jianwu HE (贺建武)1,2, Longfei MA (马隆飞)1,2, Senwen XUE (薛森文)1,2 , Chu ZHANG (章楚)1,2, Li DUAN (段俐)1,2 and Qi KANG (康琦)1,2   

  1. 1 National Micro Gravity Laboratory, Institute of Mechanics, CAS, Beijing 100190, People’s Republic of China 2 School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
  • Received:2017-07-13 Online:2018-01-11 Published:2017-09-01
  • Supported by:

    This work is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB23030100).

Abstract:

Inductively coupled radio-frequency (RF) plasma neutralizer (RPN) is an insert-free device that can be employed as an electron source in electric propulsion applications. Electron-extraction characteristics of the RPN are related to the bulk plasma parameters and the device’s geometry. Therefore, the effects of different electron-extraction apertures and operational parameters upon the electron-extraction characteristics are investigated according to the global nonambipolar flow andsheathmodel. Moreover,these models canalsobeusedtoexplain why the electron-extraction characteristics of the RPN strongly depend upon the formation of the anode spot. During the experimental study, two types of anode spots are observed. Each of them has unique characteristics of electron extraction. Moreover, the hysteresis of an anode spot is observed by changing the xenon volume-flow rates or the bias voltages. In addition, the rapid ignited method, gas-utilization factor, electron-extraction cost and other factors that need to be considered in the design of the RPN are also discussed.

Key words: electron source, plasma cathode, RF neutralizer, RF plasma, anode spot

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