Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Jian CHEN (陈坚); Tianzuo FU (付天佐); Heng GUO (郭恒); Heping LI (李和平); Dongjun JIANG (姜东君); Mingsheng ZHOU (周明胜)

doi:10.1088/2058-6272/aaf884

Plasma Science and Technology > 2019 > 21(4): 45402-045402. > DOI: 10.1088/2058-6272/aaf884

Jian CHEN (陈坚), Tianzuo FU (付天佐), Heng GUO (郭恒), Heping LI (李和平), Dongjun JIANG (姜东君), Mingsheng ZHOU (周明胜). Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates[J]. Plasma Science and Technology, 2019, 21(4): 45402-045402. DOI: 10.1088/2058-6272/aaf884

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Effects of electron temperature on the ion extraction characteristics in a decaying plasma confined between two parallel plates

Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China

Funds: This work was supported by National Natural Science Foundation of China (No. 11775128)

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Received Date: September 07, 2018

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Abstract

In this paper, a one-dimension particle-in-cell (PIC) code (EDIPIC) is employed to simulate the parallel-plate ion extraction process under an externally applied electrostatic field, focusing on the analysis of the influence of the initial electron temperature on the extracted ion fluxes to the metal plates during the ion extraction process. Compared with previously published results, the plasma oscillations on a timescale of the electron plasma period, and the excitation of the ion acoustic rarefaction waves resulting from the plasma oscillations originating from both the negative and positive electrodes, are studied for the first time. The modeling results show that both the negative and positive extractors can collect ions due to the plasma oscillations and the propagation of the ion acoustic rarefaction waves. With the increase of the initial electron temperature achieved by keeping other parameters unchanged, on the one hand, both the ion speed and flux to the negative and positive plates increase, which leads to a significant decrease of the ion extraction time, while on the other hand, the ion flux to the positive plate after the formation of a Child–Langmuir sheath is much more sensitive to an increase of the initial electron temperature than that to the negative plate. The PIC simulation results provide a deeper physical understanding of the influence of the initial electron temperature on the characteristics of the entire ion extraction process in a decaying plasma.
- low-pressure plasma,
- decaying plasma,
- sheath dynamics

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