共 25 条
Nonlinear evolution of driven ion acoustic waves in plasmas with super-Gaussian electron velocity distributions: Fluid vs particle-in-cell simulations
被引:0
|作者:
Guo, Zhi-Jian
[1
,2
,3
]
Zhuo, Hong-Bin
[2
,3
]
Li, Ming-Qiang
[1
,2
,3
]
Zheng, Yu-Jia
[1
,2
,3
]
Li, Ran
[2
,3
]
Zhou, Cang-Tao
[2
,3
]
机构:
[1] Shenzhen Univ, Coll Appl Technol, Shenzhen 518060, Peoples R China
[2] Shenzhen Technol Univ, Ctr Intense Laser Applicat Technol, Shenzhen Key Lab Ultraintense Laser & Adv Mat Tech, Shenzhen 518118, Peoples R China
[3] Shenzhen Technol Univ, Coll Engn Phys, Shenzhen 518118, Peoples R China
基金:
中国国家自然科学基金;
国家重点研发计划;
关键词:
STIMULATED BRILLOUIN-SCATTERING;
INVERSE BREMSSTRAHLUNG;
THOMSON SCATTERING;
FREQUENCY-SHIFT;
SATURATION;
INSTABILITY;
D O I:
10.1063/5.0211362
中图分类号:
O35 [流体力学];
O53 [等离子体物理学];
学科分类号:
070204 ;
080103 ;
080704 ;
摘要:
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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