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Title: Non-linear plasma wake growth of electron holes

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4915526· OSTI ID:1546884

We report that an object's wake in a plasma with small Debye length that drifts across the magnetic field is subject to electrostatic electron instabilities. Such situations include, for example, the moon in the solar wind and probes in magnetized laboratory plasmas. The instability drive mechanism can equivalently be considered drift down the potential-energy gradient or drift up the density-gradient. The gradients arise because the plasma wake has a region of depressed density and electrostatic potential into which ions are attracted along the field. The non-linear consequences of the instability are analysed in this paper. At physical ratios of electron to ion mass, neither linear nor quasilinear treatment can explain the observation of large-amplitude perturbations that disrupt the ion streams well before they become ion-ion unstable. Here we show, however, that electron holes, once formed, continue to grow, driven by the drift mechanism, and if they remain in the wake may reach a maximum non-linearly stable size, beyond which their uncontrolled growth disrupts the ions. The hole growth calculations provide a quantitative prediction of hole profile and size evolution. Hole growth appears to explain the observations of recent particle-in-cell simulations.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0010491
OSTI ID:
1546884
Alternate ID(s):
OSTI ID: 1228575
Journal Information:
Physics of Plasmas, Vol. 22, Issue 3; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (5)

Electron phase-space hole transverse instability at high magnetic field journal September 2019
Prediction and Observation of Electron Instabilities and Phase Space Holes Concentrated in the Lunar Plasma Wake: ARTEMIS LUNAR WAKE journal May 2018
Properties of Electron Phase Space Holes in the Lunar Plasma Environment journal July 2019
Electron holes in phase space: What they are and why they matter journal May 2017
Plasma electron-hole kinematics: momentum conservation preprint January 2016

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