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Title: Interactions of electrons with two lower hybrid waves

The effects of perturbed orbits on the interactions of electrons with two lower hybrid waves, one of which is resonant with electrons at a low phase velocity (v p1 = 3.8V the, where v p1 is the wave phase velocity and V the is the electron thermal speed) while the other is off-resonant at a high phase velocity (v p2 = 5.5V the), have been studied by using the particle simulation code based on the gyro-kinetic electron and fully-kinetic ion (GeFi) model [Lin et al., Plasma Phys. Controlled Fusion 47, 657 (2005)]. When the amplitude of the off-resonant wave is sufficiently small so that the resonances of these two waves do not overlap, the variation of the resonant wave amplitude is similar to that predicted by O'Neil's theory [O'Neil, Plasma Fluid 8, 12 (1965)]. With the increasing amplitude, the two resonances overlap and large scale chaos emerges. As a result, the damping of the resonant wave can be enhanced, which is due to that the trapped electron orbits are significantly perturbed by the off-resonant wave. The diffusion process gives rise to the enhanced damping. In conclusion, when the overlap is sufficiently large, the damping of the off-resonant wave and themore » oscillatory behavior of the wave amplitude are observed. In addition, the resonant plateau in the distribution function can be broadened due to the change in the chaotic region boundaries as the electron perturbed orbits are taken into account.« less
Authors:
 [1] ;  [2] ; ORCiD logo [2] ;  [2] ;  [3] ;  [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Plasma Physics; Univ. of Science and Technology of China, Hefei (China); Chinese Academy of Sciences (CAS), Hefei (China). Center for Magnetic Fusion Theory
  2. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Plasma Physics; Chinese Academy of Sciences (CAS), Hefei (China). Center for Magnetic Fusion Theory
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Plasma Physics; Auburn Univ., AL (United States). Physics Dept.
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Plasma Physics; Auburn Univ., AL (United States). Physics Dept.
Publication Date:
Grant/Contract Number:
SC0010486; NSF-AGS-1405225; 2013GB111002; 2013GB112010; 2015GB101003
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Auburn Univ., AL (United States). Physics Dept.
Sponsoring Org:
USDOE; National Science Foundation (NSF); National Natural Science Foundation of China (NNSFC)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1468936

Huang, Yueheng, Xiang, Nong, Jia, Guozhang, Li, Dehui, Wang, Xueyi, and Lin, Yu. Interactions of electrons with two lower hybrid waves. United States: N. p., Web. doi:10.1063/1.4963393.
Huang, Yueheng, Xiang, Nong, Jia, Guozhang, Li, Dehui, Wang, Xueyi, & Lin, Yu. Interactions of electrons with two lower hybrid waves. United States. doi:10.1063/1.4963393.
Huang, Yueheng, Xiang, Nong, Jia, Guozhang, Li, Dehui, Wang, Xueyi, and Lin, Yu. 2016. "Interactions of electrons with two lower hybrid waves". United States. doi:10.1063/1.4963393. https://www.osti.gov/servlets/purl/1468936.
@article{osti_1468936,
title = {Interactions of electrons with two lower hybrid waves},
author = {Huang, Yueheng and Xiang, Nong and Jia, Guozhang and Li, Dehui and Wang, Xueyi and Lin, Yu},
abstractNote = {The effects of perturbed orbits on the interactions of electrons with two lower hybrid waves, one of which is resonant with electrons at a low phase velocity (vp1 = 3.8Vthe, where vp1 is the wave phase velocity and Vthe is the electron thermal speed) while the other is off-resonant at a high phase velocity (vp2 = 5.5Vthe), have been studied by using the particle simulation code based on the gyro-kinetic electron and fully-kinetic ion (GeFi) model [Lin et al., Plasma Phys. Controlled Fusion 47, 657 (2005)]. When the amplitude of the off-resonant wave is sufficiently small so that the resonances of these two waves do not overlap, the variation of the resonant wave amplitude is similar to that predicted by O'Neil's theory [O'Neil, Plasma Fluid 8, 12 (1965)]. With the increasing amplitude, the two resonances overlap and large scale chaos emerges. As a result, the damping of the resonant wave can be enhanced, which is due to that the trapped electron orbits are significantly perturbed by the off-resonant wave. The diffusion process gives rise to the enhanced damping. In conclusion, when the overlap is sufficiently large, the damping of the off-resonant wave and the oscillatory behavior of the wave amplitude are observed. In addition, the resonant plateau in the distribution function can be broadened due to the change in the chaotic region boundaries as the electron perturbed orbits are taken into account.},
doi = {10.1063/1.4963393},
journal = {Physics of Plasmas},
number = 9,
volume = 23,
place = {United States},
year = {2016},
month = {9}
}