On the theory of discharge in crossed fields

Vlasov, M. A.; Zharinov, A. V.; Kovalenko, Yu. A.

doi:10.1134/1.1427986

Cited by 20 publications

(14 citation statements)

References 2 publications

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“…Based on the Poisson equation for the potential distribution between the anode and cathode, it was shown that the quasi-neutrality of the medium is not realized in such a model and that the maximum density of ionic current can only exceed a few times the current density corresponding to the Child-Langmuir limit j CL . For the flow model of a discharge with eV d /mc 2 =1 relativistic equations from [40] were used in [41,42]. They demonstrated the operation of almost quasi-linear modes of the medium between the anode and the cathode with the ionic current density far exceeding j CL .…”

Section: Generation Of the Anodic Layer-a Virtual Anodementioning

confidence: 99%

Anomalous acceleration of ions in a plasma accelerator with an anodic layer

Bardakov

Ivanov

Kazantsev

et al. 2018

Plasma Sci. Technol.

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In a plasma accelerator with an anodic layer (PAAL), we discovered experimentally the effect of 'super-acceleration' of the bulk of the ions to energies W exceeding the energy equivalent to the discharge voltage V d. The E×B discharge was ignited in an environment of atomic argon and helium and molecular nitrogen. Singly charged argon ions were accelerated most effectively in the case of the largest discharge currents and pressure P of the working gas. Helium ions with W>eV d (e being the electron charge) were only recorded at maximum pressures. Molecular nitrogen was not accelerated to energies W>eV d. Anomalous acceleration is realized in the range of radial magnetic fields on the anode 2.8×10-2 B rA 4×10-2 T. It was also found analytically that the cathode of the accelerator can receive anomalously accelerated ions. In this case, the value of the potential in the anodic layer becomes higher than the anode potential, and the anode current exceeds some critical value. Numerical modeling in terms of the developed theory showed qualitative agreement between modeling data and measurements.

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Section: Generation Of the Anodic Layer-a Virtual Anodementioning

confidence: 99%

Anomalous acceleration of ions in a plasma accelerator with an anodic layer

Bardakov

Ivanov

Kazantsev

et al. 2018

Plasma Sci. Technol.

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“…A number of other aspects of the operation of discharges in crossed E´B fields applied to its use in plasma electron sources are considered in [44,46,[53][54][55][56]. …”

Section: Discharges In Crossed Electric and Magnetic Fieldsmentioning

confidence: 99%

Low‐Pressure Discharges for Plasma Electron Sources

Окс

2006

Plasma Cathode Electron Sources

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Two conflicting requirements occur in the design of plasma-cathode electron sources, both of which need to be met simultaneously. In order to ensure the required emission current density, adequate plasma density must be attained, for which efficient ionization in the plasma near the emission boundary must be provided. On the other hand, accelerating the electron beam to the required energy calls for the application of high voltage in the region of electron-beam formation and acceleration; this in turn necessitates decreasing the ionization processes that can cause breakdown within the acceleration gap. High electric field in the acceleration gap is needed to provide the electron energy, but this same high field can cause breakdown in the gap. This problem can be solved by establishing a pressure difference between the plasma generation region and the electron extraction region. This is possible, however, only for the case of a relatively small plasma emission surface area, e.g., for small-area focused electron beams. For large-cross-section electron beams or electron beams generated at fore-vacuum pressures, it is difficult or almost impossible to produce such a pressure difference. In this case the choice of an appropriate discharge system that is capable of providing conditions for efficient generation of electrons in the plasma and their stable extraction is likely to be the only way for successful operation of a plasma-cathode electron source.The discharge employed in plasma-cathode electron sources must provide generation of dense plasma in the region of electron extraction, at the lowest possible pressure. From this standpoint the most suitable kinds of plasma sources are the hollow-cathode glow discharge, discharges in crossed electric and magnetic fields, such as Penning or cylindrical magnetron discharges, the constricted arc discharge, and the vacuum arc. Note that for most plasma cathodes, two different discharge systems are combined into a single device. For instance, one of the discharges (the main discharge) is used to produce the emissive plasma and the other (the auxiliary discharge) is employed to initiate and sustain the main discharge. Let us briefly consider the peculiarities of each of the discharge systems that are most commonly employed in plasma-cathode electron sources.

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“…There has been a growing interest in recent years in the generation of intense charged particle fluxes for applications such as space ion thrusters, plasma accelerators, and ion beam sources for surface treatment. [1][2][3][4][5][6][7][8][9][10] In addition, demands for miniaturization of microelectronic circuits and fabrication of flexible electronic devices make it important to improve the adhesion strength between coatings and substrates made of polymers and other insulators. Among the recent advances in magnetodynamic methods for plasma acceleration, an accelerator with closed-drift electrons in an electric discharge in the E ϫ B fields is particularly promising.…”

Section: Introductionmentioning

confidence: 99%

Linear ion source with magnetron hollow cathode discharge

Tang

Wang

et al. 2005

Review of Scientific Instruments

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A linear ion source with magnetron hollow cathode discharge is described in this paper. The linear ion source is based on an anode layer thruster with closed-drift electrons that move in a closed path in the E ϫ B fields. An open slit configuration is designed at the end of the ion source for the extraction of the linear ion beam produced by the magnetron hollow cathode discharge. The special configurations enable uninterrupted and expanded operation with oxygen as well as other reactive gases because of the absence of an electron source in the ion source. The ion current density and uniformity were experimentally evaluated. Using the ion source, surface modification was conducted on polyethylene terephthalate polymer films to improve the adhesion strength with ZnS coatings.

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On the theory of discharge in crossed fields

Cited by 20 publications

References 2 publications

Anomalous acceleration of ions in a plasma accelerator with an anodic layer

Anomalous acceleration of ions in a plasma accelerator with an anodic layer

Low‐Pressure Discharges for Plasma Electron Sources

Linear ion source with magnetron hollow cathode discharge

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