A vacuum arc can arise when the surfaces of metal electrodes in contact with a good vacuum begin to emit electrons either through heating (thermionic emission) or via an electric field that is sufficient to cause field emission. The M acro E xpansion T emplate A ttribute L anguage complements TAL, providing macros which allow the reuse of code across An electrode is an Electrical conductor used to make contact with a nonmetallic part of a circuit (e This vacuum means "absence of matter" or "an empty area or space" for the cleaning appliance see Vacuum cleaner. The electron is a fundamental Subatomic particle that was identified and assigned the negative charge in 1897 by J Thermionic emission is the flow of Charge carriers from a surface or over some other kind of Electrical potential barrier caused by thermal vibrational energy In Physics, the space surrounding an Electric charge or in the presence of a time-varying Magnetic field has a property called an electric field (that can Field emission (FE is the emission of electrons from the surface of a condensed phase into another phase due to the presence of high electric fields Once initiated, a vacuum arc can persist since the freed particles gain kinetic energy from the electric field, heating the metal surfaces through high speed particle collisions. The kinetic energy of an object is the extra Energy which it possesses due to its motion This process can create an incandescent cathode spot which frees more particles, thereby sustaining the arc. At sufficiently high currents an incandescent anode spot may also be formed.
Electrical discharge in vacuum is important for certain types of vacuum tubes and for high voltage vacuum switches. Electrostatic discharge ( ESD) is the sudden and momentary Electric current that flows between two objects at different Electrical potentials The term is This article is about the electronic device not an evacuated pipe used for experiments in Free-fall. A switch is a mechanical device used to connect and disconnect an electric Circuit at will
The thermionic vacuum arc (TVA) is a new type of plasma source, which generates a pure metal and ceramic vapour plasma containing ions with a directed energy. TVA discharges can be ignited in high vacuum conditions between a heated cathode (electron gun) and an anode(tungsten crucible) containing the material. The accelerated electron beam, incident on the anode, heats the crucible, together with its contents, to a high temperature. After establishing a steadystate density of the evaporating anode material atoms, and when the voltage applied is high enough, a bright discharge is ignited between the electrodes.
References
- Messyats, Gennady A. ; Proskurovsky, D. I. (1989). Pulsed Electrical Discharge in Vacuum (Springer Series on Atoms and Plasmas, 5), 1st Edition, Springer-Verlag. ISBN 0-387-50725-6.
- Greenwood, Allan (1994). Vacuum Switchgear (I E E Power Engineering Series), 1st Edition, Pergamon Press. ISBN 0-85296-855-8.
- Akan, Tamer; Demirkol, Serdar; Ekem, Naci; Pat, Suat; Musa, Geavit (2007). "Study of Metal and Ceramic Thermionic Vacuum arc Discharges". Plasma Sci. Technol. 9: 280–283. doi:. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document.
See also
An electric arc is an Electrical breakdown of a gas which produces an ongoing plasma discharge, resulting from a current flowing through normally nonconductive Gas discharge lamps are a family of artificial light sources that generate light by sending an Electrical discharge through an ionized gas iDapyx Software network: MP3 Explorer | Ebook Manager | Zenithic