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journal article·2020-06-01Open access

Ion current collection by double flush-mounted probe in intermediate-pressure plasmas

Pengcheng Yu, Yu Liu, Yiming Ling, Zhongkai Zhang, Jinxiang Cao, Jiuhou Lei, Xiao Zhang

AIP Advances· Volume 10· Issue 6
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Source abstract

Abstract

A double flush-mounted probe method is proposed to analyze the characteristics of intermediate-pressure plasmas (10–100 Pa) by a sheath criterion. The analytical model mainly focuses on the effect of the ion drift velocity in the sheath edge and then provides a correction factor for the measured ion-collection current. The reduction of the ion current is attributed to ion–neutral collisions leading to the modified Bohm velocity. To validate this method, the ion density is calculated and compared with that measured by two types of cylindrical probes, and the results agree well with the data measured by other probes. On the basis of this work, the double flush-mounted probe can be adopted to diagnose plasma parameters accurately, without a reference electrode, in collisional and certain complex plasma environments, such as the reentry plasma sheath.
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Research context

OpenAlex topics: Plasma Diagnostics and Applications · Magnetic confinement fusion research · Metal and Thin Film Mechanics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CAS Key Laboratory of Geospace Environment, Department of Engineering and Applied Physics, University of Science and Technology of China 1 , Hefei, Anhui 230026, China

CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China 2 , Hefei, Anhui 230026, China

CAS Center for Excellence in Comparative Planetology 3 , Hefei 230026, China

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University 4 , Shenzhen, Guangdong 518060, People’s Republic of China and , P.O. Box 1126, Hefei, Anhui 230031, People’s Republic of China

Institute of Plasma Physics, Chinese Academy of Sciences 4 , Shenzhen, Guangdong 518060, People’s Republic of China and , P.O. Box 1126, Hefei, Anhui 230031, People’s Republic of China

Funding

The B-Type Strategic Priority Program of the Chinese Academy of Sciences · The KSPEX Device Was Supported by the Grants From NSFC · The USTC Research Funds of the Double First-Class Initiative · The China Postdoctoral Science Foundation of China · The Pre-Research Project on Civil Aerospace Technologies · The Fundamental Research Funds for the Central Universities · Youth Innovation Promotion Association

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