About localization and suppression of the so-called ion-acoustic instability in a low-density single-ended Q-machine

Popa, G.; Sanduloviciu, M.; Kühn, S.; Oertl, M.; Schrittwieser, R.

doi:10.1016/0375-9601(82)90105-0

Physics Letters A

1982

DOI: 10.1016/0375-9601(82)90105-0

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About localization and suppression of the so-called ion-acoustic instability in a low-density single-ended Q-machine

G. Popa

M. Sanduloviciu

S. Kühn

et al.

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Cited by 9 publications

(1 citation statement)

References 7 publications

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“…4 have found that the instability in question can be made to disappear by raising the (positive) dc bias U E applied to the "exciting" cold electrode E (target electrode) above a certain critical value which depends on the detailed experimental conditions. For U E not too far above this critical value, the electron sheath in front of E occupies a significant portion of the interelectrode distance, but there still remains a short plasma column between the hot plate and the sheath edge.…”

mentioning

confidence: 99%

Comment on "Dynamics of a Potential Barrier Formed on the Tail of a Moving Double Layer in a Collisionless Plasma"

Kühn

1983

Phys. Rev. Lett.

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confidence: 99%

Comment on "Dynamics of a Potential Barrier Formed on the Tail of a Moving Double Layer in a Collisionless Plasma"

Kühn

1983

Phys. Rev. Lett.

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The Physics of Bounded Plasma Systems (BPS's): Simulation and Interpretation

Kühn

1994

Contrib. Plasma Phys.

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The dynamical behavior of a bounded plasma system (BPS) is, by definition, characterized by the simultaneous and self-consistent interaction of the plasma itself, its material boundaries, and whatever external circuit(s) there may be. A full theoretical description of these systems, which are of relevance in a variety of fields (e.g., plasma technology), must involve (microscopic or macroscopic) evolution equations for the plasma, Maxwell's equations for the fields, boundary conditions for the plasma and the fields, and the external-circuit equation(s). By "BPS simulation" we mean obtaining theoretical (including numerical) results from models accounting, at least conceptually, for all the basic features mentioned above.This paper is exclusively concerned with microscopic (i.e., kinetic and particle) BPS simulation. A very general system of basic equations for kinetic BPS simulation is proposed. With the PD ("plasma device") codes from U.C. Berkeley [BIRDSALL, C. K., IEEE Trans. Plasma Sci. 19 (1991) 651, particle simulations of (14 3 4 BPS's can now be routinely performed by everybody. Particular emphasis is laid on an alternative method called "trajectory simulation", which has shown great potential for kinetic BPS simulation with high accuracy and resolution. From the point of view of nonlinear dynamics, BPS's are rather complex dissipative systems exhibiting, in particular, regular and chaotic attractor states. For their proper interpretation, an advisable (if not indispensable) first step is to carefully study relatively simple, but still representative "archetypal" BPS's, such as the Pierce diode [GODFREY, B. B., Phys. Fluids 30 (1987) I5531 and the single-emitter plasma diode or "KDSI" [CRYSTAL. T. L., et al., Phys. Fluids B 3 (1991) 2441. These systems and representative results obtained therewith are surveyed, and both recent developments and future perspectives of BPS physics are addressed.

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Trapped-electron effects on time-independent negative-bias states of a collisionless single-emitter plasma device: Theory and simulation

Crystal

Gray

Lawson

et al. 1991

Physics of Fluids B: Plasma Physics

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Time-average values from particle simulations of a collisionless, single-emitter plasma device modeling single-ended Q machines or thermionic converters with a negatively biased collector are presented. These results quantitatively confirm the predictions of collisionless, kinetic plane-diode theory for spatial potential profiles that decrease monotonically. However, simulations of negative-bias potential profiles with a single internal maximum differ significantly from previous theoretical predictions which assumed electron phase space to have either (i) no trapped electrons or (ii) trapped electrons isothermal with the passing electrons. A more general class of trapped-electron model distributions is introduced from which new equilibrium potential values can be recovered that closely match the simulations. These simulations clearly demonstrate the sensitive role that trapped electrons play in shaping the potential profiles of the equilibrium (or slowly evolving) states of the simulated systems. The trapped-electron distributions in these simulations are themselves shown to be controlled critically by fluctuations whose levels are varied by the choice of particle injection scheme. These effects, although found and discussed here in the context of a particular model, are believed to be important in many bounded plasma systems where electrons can be trapped in potential wells.

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About localization and suppression of the so-called ion-acoustic instability in a low-density single-ended Q-machine

Cited by 9 publications

References 7 publications

Comment on "Dynamics of a Potential Barrier Formed on the Tail of a Moving Double Layer in a Collisionless Plasma"

Comment on "Dynamics of a Potential Barrier Formed on the Tail of a Moving Double Layer in a Collisionless Plasma"

The Physics of Bounded Plasma Systems (BPS's): Simulation and Interpretation

Trapped-electron effects on time-independent negative-bias states of a collisionless single-emitter plasma device: Theory and simulation

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