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Comment on ‘Information hidden in the velocity distribution of ions and the exact kinetic Bohm criterion’

2019Journal article Open access
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dc.contributor.authorBenilov, M. S.
dc.date.accessioned2022-09-06T10:43:49Z
dc.date.available2022-09-06T10:43:49Z
dc.date.issued2019
dc.description.abstractTsankov and Czarnetzki (2017 Plasma Sources Sci. Technol. 055003) showed that measurements with a wall-mounted plasma monitor can allow noninvasive access to spatially resolved plasma parameters, including the ion velocity distribution. On the basis of experimental data and numerical modeling, they proposed a new form of collisionally modified kinetic Bohm criterion. In this work, we point out that the kinetic Bohm criterion may be written in a form that is exactly equivalent to the original criterion but does not pose the much-debated problem of divergence for slow ions. This form enables one to show that the kinetic Bohm criterion, as well as the Bohm criterion for monoenergetic ions, has a distinct mathematical meaning. Collisionally modified Bohm criteria do not possess the same, or any other, mathematical meaning. Hence, there are no mathematical grounds for speaking of a collisionally-modified Bohm criterion and no non-arbitrary way to introduce it. Therefore, the use of the term ‘exact kinetic Bohm criterion’ in the paper by Tsankov and Czarnetzki is hardly justified.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBenilov, M. S. (2019). Comment on ‘Information hidden in the velocity distribution of ions and the exact kinetic Bohm criterion’. Plasma Sources Science and Technology, 28(7), 078001. DOI: 10.1088/1361-6595/ab0f58pt_PT
dc.identifier.doi10.1088/1361-6595/ab0f58pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4569
dc.language.isoengpt_PT
dc.peerreviewednopt_PT
dc.publisherIOP Publishingpt_PT
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.relation.publisherversionhttps://iopscience.iop.org/article/10.1088/1361-6595/ab0f58/metapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSheathpt_PT
dc.subjectPlasma-sheath transitionpt_PT
dc.subjectBohm criterionpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleComment on ‘Information hidden in the velocity distribution of ions and the exact kinetic Bohm criterion’pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2013/PT
oaire.citation.issue7pt_PT
oaire.citation.startPage078001pt_PT
oaire.citation.titlePlasma Sources Science and Technologypt_PT
oaire.citation.volume28pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameBenilov
person.givenNameMikhail
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0001-9059-1948
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id7005138676
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication5ccf95a3-53d5-446c-857c-55d64b887175
relation.isAuthorOfPublication.latestForDiscovery5ccf95a3-53d5-446c-857c-55d64b887175
relation.isProjectOfPublication773f8550-0778-4bd3-b859-600f4fca9629
relation.isProjectOfPublication.latestForDiscovery773f8550-0778-4bd3-b859-600f4fca9629

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