Striations

Nedospasov, A. V.

doi:10.1070/pu1968v011n02abeh003806

Cited by 121 publications

(63 citation statements)

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“…Consequently, a correct account of the effect of surface charge on the walls on the dc gas breakdown is associated with a complicated theoretical treatment, so we did not attempt to model this within the framework of this study. Some results in this important field may be found in [51][52][53][54][55][56][57].…”

Section: Resultsmentioning

confidence: 99%

Low-pressure gas breakdown in uniform dc electric field

Lisovskiy¹,

Yakovin²,

Yegorenkov³

2000

J. Phys. D: Appl. Phys.

147

120

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Abstract. This paper studies in experiment and theory the breakdown of argon, nitrogen, air and oxygen in a uniform dc electric field at different discharge gaps L, discharge tube radii R and cathode materials. At arbitrary geometric dimensions of the cylindrical discharge vessel and cathode materials the ratio of the breakdown electric field value to the gas pressure p at the minimum of the breakdown curves is shown to remain constant, (E dc /p) min ≈ constant. A modified breakdown law for the low-pressure dc dischargeThat is, the breakdown voltage U dc is shown to depend not only on the product pL, but also on the ratio L/R. A method is presented enabling one to predict a dc breakdown curve in the cylindrical discharge vessel possessing arbitrary L and R values from the measured data on the dc breakdown.

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Section: Resultsmentioning

confidence: 99%

Low-pressure gas breakdown in uniform dc electric field

Lisovskiy¹,

Yakovin²,

Yegorenkov³

2000

J. Phys. D: Appl. Phys.

147

120

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“…Since the layered-glow is a kind of striations observed in conventional DC plasmas, it is noticed a) Contributed paper, published as part of the Proceedings of the 15th International Conference on Ion Sources, Chiba, Japan, September 2013. b) Electronic mail: jkjlsh1@snu.ac.kr that the potential structure of layered-glow is similar to that of striation, i.e., a step-like double layer potential structure. 5,6 Therefore, it is recognized that some fraction of electrons can be accelerated through the step-like potential structure such that they may have sufficient energy to additionally ionize the helium ions already existed in the plasma ball.…”

Section: Introductionmentioning

confidence: 99%

Investigation of helium ion production in constricted direct current plasma ion source with layered-glows

Lee

Chung

Park³

et al. 2014

Review of Scientific Instruments

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Generation of helium ions is experimentally investigated with a constricted direct current (DC) plasma ion source operated at layered-glow mode, in which electrons could be accelerated through multiple potential structures so as to generate helium ions including He(2+) by successive ionization collisions in front of an extraction aperture. The helium discharge is sustained with the formation of a couple of stable layers and the plasma ball with high density is created near the extraction aperture at the operational pressure down to 0.6 Torr with concave cathodes. The ion beam current extracted with an extraction voltage of 5 kV is observed to be proportional to the discharge current and inversely proportional to the operating pressure, showing high current density of 130 mA/cm(2) and power density of 0.52 mA/cm(2)/W. He(2+) ions, which were predicted to be able to exist due to multiple-layer potential structure, are not observed. Simple calculation on production of He(2+) ions inside the plasma ball reveals that reduced operating pressure and increased cathode area will help to generate He(2+) ions with the layered-glow DC discharge.

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“…At the end of the sixties, the interpretation of the mechanisms of the origin and propagation of striations was based upon hydrodynamic models [1,2,3]. The range of applicability of fluid models is limited by a high pressure and/or large currents.…”

Section: Introductionmentioning

confidence: 99%

Non-local electron kinetics and densities of excited atoms in S- and P-striations

et al. 2000

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Solution of the Boltzmann kinetic equation with account for elastic and inelastic impacts in experimentally measured electric fields in the presence of striations is obtained. Energy electron distribution functions (EEDF) are calculated. Comparison of the calculated and measured EEDFs is performed. Non-local approach shows that the excitation and ionisation are due to electrons which received their energy after passing one period of striation. This results in phase shifts between the electric fields, ionisation and the electron density that cause wave propagation. Analysis of the ionisation and excitation processes of levels 2p 5 3s and 2p 5 3p with the help of the calculated EEDFs is made. Direct, stepwise and pair collision processes were considered. The distribution of the excited atoms densities over the striation period is obtained. Time and space resolved measurements of the absolute values of the excited atoms densities in states 2p 5 3s and 2p 5 3p were performed. The comparison shows a good agreement of the measured and calculated densities of the excited atoms.

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Striations

Cited by 121 publications

References 0 publications

Low-pressure gas breakdown in uniform dc electric field

Low-pressure gas breakdown in uniform dc electric field

Investigation of helium ion production in constricted direct current plasma ion source with layered-glows

Non-local electron kinetics and densities of excited atoms in S- and P-striations

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