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[{"key": "dc.contributor.advisor", "value": "Toivanen, Ville", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Koivisto, Hannu", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Huovila, Juuso", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2023-05-02T07:20:18Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2023-05-02T07:20:18Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2023", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/86710", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "T\u00e4m\u00e4 pro gradu -tutkielma k\u00e4sittelee kineettisten plasmaep\u00e4stabiilisuuksien kytk\u00f6st\u00e4 elektronisyklotroniresonanssi-ionil\u00e4hteiden (ECRIS) plasmapotentiaaliin. Plasmapotentiaalin muutoksia tutkittiin mittaamalla ionil\u00e4hteen tuottaman ionisuihkun energiavaihteluita k\u00e4ytt\u00e4m\u00e4ll\u00e4 ionil\u00e4hteen j\u00e4lkeist\u00e4 dipolimagneettia energia-analysaattorina happi- ja heliumplasmoista muodostetuille ionisuihkuille. Kyseisi\u00e4 mittauksia tehtiin ionil\u00e4hteen ollessa pulssitetussa sek\u00e4 jatkuvassa operointitilassa. Mittaukset suoritettiin esitetty\u00e4 tutkimusta varten kehitetyll\u00e4 SAMPPA-mittausj\u00e4rjestelm\u00e4ll\u00e4, joka automatisoi dipolivirran muuttamisen halutulla mittausv\u00e4lill\u00e4 ja mittasi jokaiselle dipolivirran arvolle dipolin l\u00e4p\u00e4isev\u00e4n ionisuihkun ionivirran aikaevoluution. Kineettisten plasmaep\u00e4stabiilisuuksien toistettavuuden ansiosta t\u00e4m\u00e4 mahdollisti ionisuihkun energiassa tapahtuvien muutosten m\u00e4\u00e4ritt\u00e4misen mitatusta ionivirran k\u00e4yt\u00f6ksest\u00e4. N\u00e4ist\u00e4 energiahajonnan muutoksista voitiin m\u00e4\u00e4ritt\u00e4\u00e4 plasmapotentiaalin muutos.\n\nTutkielmassa tutkittiin ionil\u00e4hteen plasman vangintaan k\u00e4ytetyn magneettikent\u00e4n voimakkuuden, plasmakammioon johdetun neutraalikaasun paineen ja plasman l\u00e4mmitt\u00e4miseen sek\u00e4 yll\u00e4pit\u00e4miseen k\u00e4ytetyn mikroaaltos\u00e4teilyn tehon vaikutuksia plasmapotentiaalin muutokseen kineettisen ep\u00e4stabiilisuuden aikana sek\u00e4 ep\u00e4stabiilisuuksien vaikutuksen eroa ionil\u00e4hteen pulssitetun ja jatkuvan operoinnin v\u00e4lill\u00e4. Lis\u00e4ksi tutkittiin ep\u00e4stabiilisuuksien esiintymisviivett\u00e4 pulssitetussa operointitilassa suhteessa mikroaaltosy\u00f6t\u00f6n katkaisuun ja jatkuvassa operointitilassa suhteessa seuraavaan ep\u00e4stabiilisuuteen. Pulssitetussa operointitilassa tutkittiin viel\u00e4 mikroaaltopulssin aikaisen virran I_SS ja mikroaaltosy\u00f6t\u00f6n katkaisun j\u00e4lkeisen maksimivirran I_AG ionivirtasuhteen korrelaatiota ionil\u00e4hteen s\u00e4\u00e4t\u00f6parametrien kanssa. Tutkimustuloksista m\u00e4\u00e4ritettiin plasmapotentiaalin muutoksille absoluuttisia arvoja joillekin tapauksille sek\u00e4 alaraja-arvioita lopuille tapauksille.\n\nEp\u00e4stabiilisuuksien esiintymisviiveeseen, ionivirtasuhteeseen I_AG/I_SS sek\u00e4 plasmapotentiaalin muutosten suuruuteen vaikutti ionil\u00e4hteen s\u00e4\u00e4t\u00f6parametreista eniten magneettikent\u00e4n voimakkuus ja v\u00e4hiten neutraalikaasun paine. Plasmapotentiaalin muutoksen suuruus oli pulssitetulla operoinnilla ep\u00e4stabiilisuuden aikana happiplasmalla noin 0,3\u22124,6 kV, kun taas heliumplasmalla noin 0,5\u22121,5 kV s\u00e4\u00e4t\u00f6parametrista ja sen arvosta riippuen. Jatkuvalla operoinnilla heliumplasmalle plasmapotentiaalin muutokselle saatiin kaikilla parametriarvoilla alarajaksi noin 1,4 kV. S\u00e4\u00e4t\u00f6parametrien vaikutuksien trendit olivat ep\u00e4stabiilisuustapahtumien esiintymisviiveiden suhteen jatkuvan operoinnin ja pulssitetun operointitilan v\u00e4lill\u00e4 samankaltaisia.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2023-05-02T07:20:18Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2023-05-02T07:20:18Z (GMT). No. of bitstreams: 0\n Previous issue date: 2023", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "103", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": null, "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "ep\u00e4stabiilisuus", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ECR-ionil\u00e4hde", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "plasma", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "ionisuihku", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "plasmapotentiaali", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Kineettisten ep\u00e4stabiilisuuksien vaikutus ECR-ionil\u00e4hteen plasmapotentiaaliin", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-202305022805", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Soveltava fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.copyright", "value": "\u00a9 The Author(s)", "language": null, "element": "rights", "qualifier": "copyright", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4023", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "fysiikka", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "magneettikent\u00e4t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ionit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "plasma (kaasut)", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ECR", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}]
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