The nonlinear evolution of driven ion acoustic waves (IAWs) in plasmas with super-Gaussian electron distribution functions (EDFs) is numerically investigated by one-dimensional fluid and particle-in-cell (PIC) simulations. The IAW nonlinearities observed by fluid simulation show significant differences in thermal and nonthermal plasmas. It is noted that for the same fundamental potential amplitude, the harmonic and the nonlinear frequency shift are smaller in plasmas having super-Gaussian distribution as compared to Maxwellian distribution. A frequency mismatch between the driver frequency and the plasma linear response frequency has been introduced in fluid simulations to model the kinetic effect. The occurrence of each type of instability is clarified as a function of the sign and size of the frequency mismatch. The kinetic effect of particle trapping-induced nonlinear frequency shift is calculated for super-Gaussian EDFs. The PIC simulation revealed that trapped electrons can play a contrary role as trapped ions on IAW two-ion decay instabilities, which is consistent with fluid simulations.
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Univ Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
Lu, San
Lu, Quanming
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Univ Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
Lu, Quanming
Huang, Can
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Univ Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
Huang, Can
Dong, Quanli
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Ludong Univ, Sch Phys & Optoelect Engn, Yantai 264025, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
Dong, Quanli
Zhu, Jianqiang
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Chinese Acad Sci, Key Lab High Power Laser Phys, Shanghai 201800, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
Zhu, Jianqiang
Sheng, Zhengming
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Shanghai Jiao Tong Univ, MoE Key Lab Laser Plasmas, Shanghai 200240, Peoples R China
Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China
Univ Strathclyde, SUPA, Dept Phys, Glasgow G4 ONG, Lanark, ScotlandUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
Sheng, Zhengming
Wang, Shui
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Univ Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China
Wang, Shui
Zhang, Jie
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Shanghai Jiao Tong Univ, MoE Key Lab Laser Plasmas, Shanghai 200240, Peoples R China
Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R ChinaUniv Sci & Technol China, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China