Generation of coherent ion acoustic solitary waves in inhomogeneous plasmas by an odd eigenmode of electron holes

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Generation of coherent ion acoustic solitary waves (IASWs) in inhomogeneous plasmas by an odd eigenmode (OEM) of electron holes (EHs) is investigated using 1D electrostatic particle-in-cell (PIC) simulations. The OEM oscillates at a frequency comparable to the trapped electron bouncing frequency, as also demonstrated by Lewis' theoretical formalism about the linear eigenmode in Bernstein-Greene-Kruskal (BGK) equilibrium. The density gradient in the inhomogeneous plasmas causes asymmetry in the EH potential structure associated with the OEM, whose amplitude grows rapidly as it propagates through the density gradient region. As the ions interact with this asymmetric potential, which oscillates slowly enough for the ions to respond, they are ejected to the lower density side with a larger potential amplitude, forming a chain of IASWs coherently with the oscillation of the OEM. Published by AIP Publishing
Publisher
AMER INST PHYSICS
Issue Date
2016-09
Language
English
Article Type
Article
Keywords

PHASE-SPACE; DOUBLE-LAYERS; EQUILIBRIA; STABILITY; DYNAMICS

Citation

PHYSICS OF PLASMAS, v.23, no.9

ISSN
1070-664X
DOI
10.1063/1.4962500
URI
http://hdl.handle.net/10203/214290
Appears in Collection
PH-Journal Papers(저널논문)
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