Stable and unstable discharge modes of a multipole confined thermionic gas discharge at low pressure

Klostermann, H.; Greiner, Franko; Klinger, T.; Piel, A.

doi:10.1088/0963-0252/3/2/003

Cited by 19 publications

(8 citation statements)

References 25 publications

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“…Thermionic diodes can establish different stable discharge states, characterized by their axial potential profile. 24,25 The trademark features of the anode glow mode ͑AGM͒ are the formation of a virtual cathode and ionization only in a thin layer close to the anode. 26 The AGM becomes unstable at a critical anode potential and potential relaxation oscillations occur.…”

Section: B Thermionic Diodementioning

confidence: 99%

Chaos control and taming of turbulence in plasma devices

et al. 2001

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Chaos and turbulence are often considered as troublesome features of plasma devices. In the general framework of nonlinear dynamical systems, a number of strategies have been developed to achieve active control over complex temporal or spatio-temporal behavior. Many of these techniques apply to plasma instabilities. In the present paper we discuss recent progress in chaos control and taming of turbulence in three different plasma ''model'' experiments: ͑1͒ Chaotic oscillations in simple plasma diodes, ͑2͒ ionization wave turbulence in the positive column of glow discharges, and ͑3͒ drift wave turbulence in a magnetized plasma column. Depending on the physical mechanism of the specific instability in each case, an appropriate control strategy is chosen out of a variety of different approaches; in particular discrete feedback, continuous feedback, or spatio-temporal open-loop synchronization. Electric control fields are externally applied to the plasma device and the chaotic or turbulent state is stabilized by only weak perturbations of the plasma equilibrium. The success of this approach is demonstrated in both experiment and numerical simulation and the actual effect of the applied control fields is investigated.

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Section: B Thermionic Diodementioning

confidence: 99%

Chaos control and taming of turbulence in plasma devices

et al. 2001

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“…The AGM and TLM are discussed in more detail in Ref. [20]. The AGM as well as the TLM becomes unstable in certain regions of the discharge voltage.…”

Section: Stable and Unstable Discharge Statesmentioning

confidence: 99%

Nonlinear Dynamics and Chaos in Gas Discharge Systems

et al. 1995

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This paper summarizes recent experimental work on nonlinear dynamical phenomena in gas discharge plasmas. As a relatively simple example, chaotic oscillations in low-pressure thermionic discharges are discussed in detail. Period doubling bifurcations and intermittency are clearly identified as standard routes to chaotic behaviour. Most of its dynamical features are well described by simple nonlinear oscillator models. In contrast, plasma waves are spatiotemporal phenomena and thus show a much richer dynamical behaviour. This is demonstrated for current-driven drift waves in a linear magnetized plasma. Probe arrays provide the required information about the time evolution of the azimuthal wave structure

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“…Because of its pronounced non-linearity and the predominance of kinetic effects, there is up to now no closed theoretical description for this oscillation phenomenon available. The physical mechanism has been studied in some detail by the authors [4][5][6]31] by comparing experimental investigations with computer simulations. As a result a model description of the non-linear evolution during each current oscillation cycle is now available and is summarized in the subsequent section.…”

Section: Experimental Devicementioning

confidence: 99%

The Pierce diode as a model for the stability of thermionic gas discharges

Kolinsky

Greiner

Klinger

1997

J. Phys. D: Appl. Phys.

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In this work an attempt is made to understand theoretically the trigger mechanism of a Pierce-type hydrodynamic instability found experimentally in thermionic discharges at low pressure. Particle-in-cell simulations are used to obtain detailed information about plasma parameters such as phase space and potential distributions. In contrast to earlier studies, the simultaneous influence of the ion dynamics, collisions with neutrals, and the sheath capacitance is taken into account. This is done by adopting the Lagrangian description of a general Pierce diode model developed previously. The new results obtained are threefold. First, few ion - neutral collisions prevent the coupling between electron and ion dynamics on the electronic time-scale thus removing oscillatory growing Pierce - Buneman modes. Second, the classical Pierce-diode supplemented by an external capacitance to account for the damping effect of the sheath on the Pierce instability explains the existence of stable equilibria. It further reveals the nature of the bifurcation at the instability threshold, i.e. a Hopf bifurcation is the trigger mechanism of the non-linear relaxation oscillations observed in both simulation and experiment. Third, the transient behaviour prior to the instability onset is found to be qualitatively described within the hydrodynamic model.

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Stable and unstable discharge modes of a multipole confined thermionic gas discharge at low pressure

Cited by 19 publications

References 25 publications

Chaos control and taming of turbulence in plasma devices

Chaos control and taming of turbulence in plasma devices

Nonlinear Dynamics and Chaos in Gas Discharge Systems

The Pierce diode as a model for the stability of thermionic gas discharges

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