Effects of electron trapping on nonlinear electron-acoustic waves excited by an electron beam via particle-in-cell simulations

A A ABID; Quanming LU (陆全明); Huayue CHEN (陈华岳); Yangguang KE (柯阳光); S ALI; Shui WANG (王水)

doi:10.1088/2058-6272/ab033f

Plasma Science and Technology > 2019 > 21(5): 55301-055301. > DOI: 10.1088/2058-6272/ab033f

A A ABID, Quanming LU (陆全明), Huayue CHEN (陈华岳), Yangguang KE (柯阳光), S ALI, Shui WANG (王水). Effects of electron trapping on nonlinear electron-acoustic waves excited by an electron beam via particle-in-cell simulations[J]. Plasma Science and Technology, 2019, 21(5): 55301-055301. DOI: 10.1088/2058-6272/ab033f

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Effects of electron trapping on nonlinear electron-acoustic waves excited by an electron beam via particle-in-cell simulations

¹ CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei 230026, People’s Republic of China
² National Centre for Physics (NCP) at Quaid-e-Azam University Campus, Shahdra Valley Road, Islamabad 44000, Pakistan
³ Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: A A Abid acknowledges the support from Chinese Academy of Science (CAS) and TWAS for his Ph.D studies at the University of Science and Technology of China in the cate- gory of a 2016 CAS-TWAS President’s Fellowship Awardee (Series No. 2016-172). This work was also partially supported by National Natural Science Foundation of China (Nos. 41331067, 41774169, and 41527804), and the Key Research Program of Frontier Sciences, CAS (QYZDJ-SSW-DQC010).

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Received Date: October 17, 2018

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Abstract

By performing one-dimensional particle-in-cell simulations, the nonlinear effects of electron- acoustic (EA) waves are investigated in a multispecies plasma, whose constituents are hot electrons, cold electrons, and beam electrons with immobile neutralized positive ions. Numerical analyses have identified that EA waves with a sufficiently large amplitude tend to trap cold electrons. Because EA waves are dispersive, where the wave modes with different wavenumbers have different phase velocities, the trapping may lead to the mixing of cold electrons. The cold electrons finally get thermalized or heated. The investigation also shows that the excited EA waves give rise to a broad range of wave frequencies, which may be helpful for understanding the broadband-electrostatic-noise spectrum in the Earth’s auroral region.
- electron acoustic waves,
- cold electrons trapping,
- particle-in-cell (PIC) simulation

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