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Title: Nonlinear saturation of the ion-electron Buneman instability in a spherical positively pulsed gridded inertial electrostatic confinement device

A pulsed, positively biased gridded inertial electrostatic confinement device has been investigated experimentally, using Doppler broadened spectra and current and voltage traces as primary diagnostics. In the high current and energy regime explored in this paper resulting from the removal of the series ballast resistance from the external biasing circuit, large amplitude oscillations in the plasma current and potential were observed within 100‚ÄČns of the discharge onset. These oscillations are attributed to the nonlinear and saturated Buneman instability, characterised by a locked oscillation frequency as a function of increasing anode potential. The saturated Buneman instability is known to exhibit ion mass independent behaviour and cause electron trapping, resulting in a transient spatio-temporal virtual cathode and ponderomotive ion confinement, as evidenced by broadened spectra when operated at high currents.
Authors:
;  [1]
  1. Plasma Physics, School of Physics, University of Sydney, Sydney, New South Wales 2006 (Australia)
Publication Date:
OSTI Identifier:
22490063
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; ANODES; CATHODES; CONFINEMENT; ELECTRIC CURRENTS; ELECTRIC POTENTIAL; ELECTRON-ION COUPLING; ELECTRONS; IONS; LINE BROADENING; MODE LOCKING; NONLINEAR PROBLEMS; OSCILLATIONS; PLASMA INSTABILITY; PONDEROMOTIVE FORCE; PULSES; SPECTRA; SPHERICAL CONFIGURATION; TRAPPING