Cathode Heating by Vacuum Arcs: A Survey

Jüttner, B.

doi:10.1002/ctpp.19820220508

Cited by 10 publications

(1 citation statement)

References 23 publications

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“…This analysis allowed him to make a comparison between the heating of the cathode due to the ion-flux collisions and that due to ohmic heating provided by the current. A similar approach was used by Jüttner [8] to compare these two mechanisms of heating inside the cathode spot.…”

Section: Introductionmentioning

confidence: 99%

A mathematical analysis of heating effects and electrode erosion in conical electrical arc cathodes

Solana¹,

Kapadia²,

Dowden³

1998

J. Phys. D: Appl. Phys.

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A spherical system of coordinates is used to solve the time-dependent heat-conduction equation for inside a conical cathode, whose surface is subjected, during arc welding processes, to complicated thermal heat-exchange effects. These arise from a variety of factors such as ion bombardment from the main body of the electrical arc, thermionic emission from the cathode's surface and Joule heating arising from the main current-carrying body of the cathode. The heat-conduction equation has a time-dependent source term arising from a combination of Joule heating and thermionic emission and is solved analytically using integral transform techniques. The solution is expressed in terms of integrals. These allow the response of the cathode for various currents and cathode geometries to be studied.

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Section: Introductionmentioning

confidence: 99%

A mathematical analysis of heating effects and electrode erosion in conical electrical arc cathodes

Solana¹,

Kapadia²,

Dowden³

1998

J. Phys. D: Appl. Phys.

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The State of the Theory of Vacuum Arc Cathodes

Hantzsche

1983

Contrib Plasma Phys

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SummaryThe physics of vacuum taro cathodes, the advances in their interpretation and the still unsolved problems are summarized. Starting from the experimental experiences the theories of stationary arc spots are described, with their assumptions and variants, their successes and deficiencies. It is shown that an extension of them models by inclusion of non-stationary processes is inevitable. Such processes are suggested and their importance in a theory of the dynamic arc spot is investigated. Finally the role of surfacecon taminations is discussed, and the general applicability of the vacuum arc models to all kinds of arc electrodes is emphasized.

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