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dc.contributor.authorMansfeld, D.
dc.contributor.authorIzotov, I.
dc.contributor.authorSkalyga, V.
dc.contributor.authorTarvainen, Olli
dc.contributor.authorKalvas, Taneli
dc.contributor.authorKoivisto, Hannu
dc.contributor.authorKomppula, Jani
dc.contributor.authorKronholm, Risto
dc.contributor.authorLaulainen, Janne
dc.date.accessioned2016-06-21T04:28:15Z
dc.date.available2017-02-22T22:45:11Z
dc.date.issued2016
dc.identifier.citationMansfeld, D., Izotov, I., Skalyga, V., Tarvainen, O., Kalvas, T., Koivisto, H., Komppula, J., Kronholm, R., & Laulainen, J. (2016). Dynamic regimes of cyclotron instability in the afterglow mode of minimum-B electron cyclotron resonance ion source plasma. <i>Plasma Physics and Controlled Fusion</i>, <i>58</i>(4), Article 045019. <a href="https://doi.org/10.1088/0741-3335/58/4/045019" target="_blank">https://doi.org/10.1088/0741-3335/58/4/045019</a>
dc.identifier.otherCONVID_25633565
dc.identifier.otherTUTKAID_69645
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/50500
dc.description.abstractThe paper is concerned with the dynamic regimes of cyclotron instabilities in non-equilibrium plasma of a minimum-B electron cyclotron resonance ion source operated in pulsed mode. The instability appears in decaying ion source plasma shortly (1–10 ms) after switching off the microwave radiation of the klystron, and manifests itself in the form of powerful pulses of electromagnetic emission associated with precipitation of high-energy electrons along the magnetic field lines. Recently it was shown that this plasma instability causes perturbations of the extracted ion current, which limits the performance of the ion source and generates strong bursts of bremsstrahlung emission. In this article we present time-resolved diagnostics of electromagnetic emission bursts related to cyclotron instability in the decaying plasma. The temporal resolution is sufficient to study the fine structure of the dynamic spectra of the electromagnetic emission at different operating regimes of the ion source. It was found that at different values of magnetic field and heating power the dynamic spectra demonstrate common features: Decreasing frequency from burst to burst and an always falling tone during a single burst of instability. The analysis has shown that the instability is driven by the resonant interaction of hot electrons, distributed between the electron cyclotron resonance (ECR) zone and the trap center, with slow extraordinary wave propagation quasi-parallel with respect to the external magnetic field.
dc.language.isoeng
dc.publisherInstitute of Physics Publishing
dc.relation.ispartofseriesPlasma Physics and Controlled Fusion
dc.subject.othercyclotron instability
dc.subject.otherafterglow discharge
dc.subject.othermicrowave emission
dc.subject.otherplasma diagnostics
dc.subject.otherelectron cyclotron resonance ion source
dc.subject.otherZ-mode emission
dc.titleDynamic regimes of cyclotron instability in the afterglow mode of minimum-B electron cyclotron resonance ion source plasma
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201606203247
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.contributor.oppiaineKiihdytinlaboratoriofi
dc.contributor.oppiaineAccelerator Laboratoryen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2016-06-20T12:15:03Z
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.relation.issn0741-3335
dc.relation.numberinseries4
dc.relation.volume58
dc.type.versionacceptedVersion
dc.rights.copyright© 2016 IOP Publishing Ltd. This is a final draft version of an article whose final and definitive form has been published by IOP. Published in this repository with the kind permission of the publisher.
dc.rights.accesslevelopenAccessfi
dc.relation.doi10.1088/0741-3335/58/4/045019
dc.type.okmA1


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