Optimal Electrode-Solid Insulator Geometry with Accumulated Surface Charges

Pillai, A. Sivathanu; Hackam, R.

doi:10.1109/tei.1984.298806

Cited by 20 publications

(3 citation statements)

References 17 publications

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“…8, the normal components of the field at the triple junctions are zero, because the electrodes are equipotential surfaces. In the only other calculations available for comparison with the present work, by Pillai and Hackam [23][24][25][26], the charge simulation method used gives results which do not always satisfy these conditions. In Reference 24, for example, the tangential field distributions in Fig.…”

Section: Results For Plain Spacers (No Metal Inserts)mentioning

confidence: 74%

“…The geometry chosen for the numerical analysis is one which has been used in a number of experimental studies of surface charging and flashover [7,8,23], and consists of a right cylindrical spacer 40 mm in diameter and 40 mm long, with and without inserts, mounted between uniform-field electrodes in air. The relative permittivity was taken as 5.8 to correspond to that used in earlier calculations [24,25].…”

Section: Model For Numerical Analysismentioning

confidence: 99%

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Computation of the electric field at a solid/gas interface in the presence of surface and volume charges

Bektas

Farish

Hızal

1986

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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Enhancement of the electric field at a solid insulator/electrode/gas triple junction and on the surface of an insulator, due to imperfect contacts, surface irregularities and contamination, reduces the withstand voltage of the gas-only system. The charges deposited on the surface and in the bulk of the insulator, when stressed under high voltage, further modify the electric field. In the paper, the influence of accumulated static charges on the electric field distribution associated with a cylindrical insulator held between plane electrodes in atmospheric air is investigated. The electric field along the solid dielectric/air interface is calculated for different surface and volume charge distributions by using the finite-difference method based on Gauss's law. Derivation of the iteration equations are relatively easy, and, unlike most methods, there is no need for external imposition of solid dielectric/gas boundary conditions. The results indicate that, for some surface and volume charge distributions, field enhancement occurs at the triple junction, and this could initiate a surface flashover.List of symbols and units V = electric potential, V

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Section: Results For Plain Spacers (No Metal Inserts)mentioning

confidence: 74%

Section: Model For Numerical Analysismentioning

confidence: 99%

Computation of the electric field at a solid/gas interface in the presence of surface and volume charges

Bektas

Farish

Hızal

1986

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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“…-The triggered vacuum breakdown is commonly achieved by producing electrons and ions between the cathode and the anode [11]. Typically, a surface flashover in vacuum depends on the initial electrons released from the cathode triple junction, and it may occur at a voltage which is onehalf or one-third that of an unbridged gap [12]. This "selftriggered" arc initiation uses a specially designed surface discharge to realize the trigger of the vacuum breakdown.…”

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confidence: 99%

A “self-triggered” arc initiation applied in vacuum arc thrusters

Cui

Liu

Gao

2019

EPL

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The low-voltage vacuum arc initiation is of great importance for the optimization of vacuum arc thrusters (VATs). A low-voltage trigger method is proposed in this paper, which is called "self-triggered" arc initiation. This method uses a special surface flashover to generate the initial plasma and initiate the vacuum metal arc. A carbon fiber material is adopted as the trigger electrode due to its excellent field emission characteristics and it is arranged in series with a current-limiting resistance to avoid the damage caused by a heavy arc current. The experimental results show that this method is able to reduce the arc initiation voltage to several hundred volts, which is below 8% of the vacuum gap breakdown voltage. It has also been found that this trigger method is highly reliable and the trigger number of 10 4 with a low-melting-point material (Pb) has been performed. In addition, this method is proved to have no effect on the plasma generation characteristics and the impulse bit of the VATs. Therefore, the "self-triggered" method is able to achieve the similar trigger effect with other trigger methods in VATs. It provides an alternative choice for the further optimization of VATs in terms of quality and volume.

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Micro-discharges in high vacuum

Yoshimura

2020

A Review: Ultrahigh-Vacuum Technology for Electron Microscopes

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Optimal Electrode-Solid Insulator Geometry with Accumulated Surface Charges

Cited by 20 publications

References 17 publications

Computation of the electric field at a solid/gas interface in the presence of surface and volume charges

Computation of the electric field at a solid/gas interface in the presence of surface and volume charges

A “self-triggered” arc initiation applied in vacuum arc thrusters

Micro-discharges in high vacuum

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