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dc.contributor.authorIzotov, I.
dc.contributor.authorTarvainen, O.
dc.contributor.authorSkalyga, V.
dc.contributor.authorMansfeld, D.
dc.contributor.authorKoivisto, H.
dc.contributor.authorKronholm, R.
dc.contributor.authorToivanen, V.
dc.contributor.authorMironov, V.
dc.date.accessioned2020-01-21T12:18:48Z
dc.date.available2020-01-21T12:18:48Z
dc.date.issued2020
dc.identifier.citationIzotov, I., Tarvainen, O., Skalyga, V., Mansfeld, D., Koivisto, H., Kronholm, R., Toivanen, V., & Mironov, V. (2020). Measurements of the energy distribution of electrons lost from the minimum B-field : the effect of instabilities and two-frequency heating. <i>Review of Scientific Instruments</i>, <i>91</i>(1), Article 013502. <a href="https://doi.org/10.1063/1.5128322" target="_blank">https://doi.org/10.1063/1.5128322</a>
dc.identifier.otherCONVID_34152553
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/67426
dc.description.abstractFurther progress in the development of electron cyclotron resonance (ECR) ion sources (ECRISs) requires deeper understanding of the underlying physics. One of the topics that remains obscure, though being crucial for the performance of the ECRIS, is the electron energy distribution (EED). A well-developed technique of measuring the EED of electrons escaping axially from the magnetically confined plasma of an ECRIS was used for the study of the EED in an unstable mode of plasma confinement, i.e., in the presence of kinetic instabilities. The experimental data were recorded for pulsed and CW discharges with a room-temperature 14 GHz ECRIS at the JYFL accelerator laboratory. The measurements were focused on observing differences between the EED escaping from stable and unstable plasmas. It was found that nonlinear phenomena alter the EED noticeably. The electron losses are enhanced in both unstable regimes, with two-frequency heating suppressing the instabilities. It has been shown earlier that two-frequency heating boosts the ECRIS performance presumably owing to the suppression of instabilities. We report the observed changes in EED introduced by the secondary frequency in different regimes, including an off-resonance condition, where the secondary frequency is lower than the minimum frequency satisfying the resonance condition for cold electrons at the magnetic field minimum. Finally, we suggest an experimental method of qualitative evaluation of the energy distribution of electrons confined in the magnetic trap using a method of measuring energy distribution of lost electrons during the plasma decay in pulsed operation of the ion source.en
dc.format.mimetypeapplication/pdf
dc.languageeng
dc.language.isoeng
dc.publisherAmerican Institute of Physics
dc.relation.ispartofseriesReview of Scientific Instruments
dc.rightsIn Copyright
dc.titleMeasurements of the energy distribution of electrons lost from the minimum B-field : the effect of instabilities and two-frequency heating
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202001211379
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.description.reviewstatuspeerReviewed
dc.relation.issn0034-6748
dc.relation.numberinseries1
dc.relation.volume91
dc.type.versionpublishedVersion
dc.rights.copyright© 2020 the Author(s)
dc.rights.accesslevelopenAccessfi
dc.relation.grantnumber315855
dc.subject.ysohiukkaskiihdyttimet
dc.subject.ysoplasmafysiikka
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p14309
jyx.subject.urihttp://www.yso.fi/onto/yso/p10238
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.relation.doi10.1063/1.5128322
dc.relation.funderSuomen Akatemiafi
dc.relation.funderAcademy of Finlanden
jyx.fundingprogramAkatemiahanke, SAfi
jyx.fundingprogramAcademy Project, AoFen
jyx.fundinginformationThe experiment was supported by the Academy of Finland Project No. 315855. The data processing and analysis was supported by the Russian Science Foundation, Project No. 19-12-00377.


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