Bifurcation points in the theory of axially symmetric arc cathodes

Benilov, M. S.; Cunha, M. D.

Publication

Bifurcation points in the theory of axially symmetric arc cathodes

2003Journal article

dc.contributor.author	Benilov, M. S.
dc.contributor.author	Cunha, M. D.
dc.date.accessioned	2022-11-21T11:09:03Z
dc.date.available	2022-11-21T11:09:03Z
dc.date.issued	2003
dc.description.abstract	Steady-state current transfer from arc plasmas to axially symmetric cathodes is treated in the framework of the model of nonlinear surface heating. An approach is developed to calculate the bifurcation points at which three-dimensional spot-mode solutions branch off from solutions describing the diffuse mode and axially symmetric spot modes. In particular, the first bifurcation point positioned on the diffuse-mode solution has been calculated, and thus its stability limit, i.e., the current below which the diffuse mode becomes unstable. Calculation results are given for the case of a tungsten cathode in the form of a circular cylinder in high pressure plasmas. The effect produced on the stability limit by variations of control parameters ~cathode dimensions, work function of the cathode material, plasma-producing gas, and its pressure! is studied and found to conform to trends observed experimentally. The stability limit is found to be much more sensitive to variations of control parameters than characteristics of the diffuse mode are, the strongest effect being pro duced by variations of cathode dimensions and of the work function of the cathode material. This finding conforms to the fact that the diffuse-spot transition is difficult to reproduce in the experiment.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.citation	Benilov, M. S., & Cunha, M. D. (2003). Bifurcation points in the theory of axially symmetric arc cathodes. Physical Review E, 68(5), 056407.	pt_PT
dc.identifier.doi	10.1103/PhysRevE.68.056407	pt_PT
dc.identifier.uri	http://hdl.handle.net/10400.13/4791
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	American Physical Society	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/4.0/	pt_PT
dc.subject	Axially symmetric cathodes	pt_PT
dc.subject	Bifurcation points	pt_PT
dc.subject	Symmetric cathodes	pt_PT
dc.subject	.	pt_PT
dc.subject	Faculdade de Ciências Exatas e da Engenharia	pt_PT
dc.title	Bifurcation points in the theory of axially symmetric arc cathodes	pt_PT
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.issue	5	pt_PT
oaire.citation.title	Physical Review E	pt_PT
oaire.citation.volume	68	pt_PT
person.familyName	Benilov
person.familyName	Cunha
person.givenName	Mikhail
person.givenName	Mário
person.identifier.ciencia-id	0F14-A79A-97C1
person.identifier.orcid	0000-0001-9059-1948
person.identifier.orcid	0000-0002-0397-536X
person.identifier.rid	K-4443-2015
person.identifier.scopus-author-id	7005138676
person.identifier.scopus-author-id	7102711276
rcaap.rights	openAccess	pt_PT
rcaap.type	article	pt_PT
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