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[{"key": "dc.contributor.advisor", "value": "Laitinen, Mikko", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Kalvas, Taneli", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Kivek\u00e4s, Mikko", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2020-12-07T13:26:34Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2020-12-07T13:26:34Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2020", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/73000", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Tutkielmassani k\u00e4sittelen uutta mikroaaltoionil\u00e4hdett\u00e4 MicroAlphatrossia ja tutkin\nsimulaatioiden avulla ratkaisumahdollisuuksia ekstraktioj\u00e4rjestelm\u00e4ss\u00e4 ilmenneisiin\nongelmiin. MicroAlphatross on Pelletron-kiihdyttimelle tuleva uusi negatiivinen\nheliumionil\u00e4hde korvaamaan nykyisen Alphatross-l\u00e4hteen. MicroAlphatrossin on\nkehitetty Jyv\u00e4skyl\u00e4n yliopistolla ja sen kokeellisen kehityksen aikana on havaittu\nl\u00e4pily\u00f6nti\u00e4 ekstraktioj\u00e4rjestelm\u00e4n elektrodien v\u00e4lill\u00e4. Kokeellisesti t\u00e4t\u00e4 ongelmaa on\njo yritetty ratkaista, mutta ongelma ei ole poistunut.\nSimuloin IBSimu-simulaatiokirjaston avulla ionisuihkun kulkua MicroAlphatrossin\nekstraktiossa. Simulaatioissa tarkastelen ionien ratoja, ionisuihkun virtaa\nja emittanssia. Ratkaisua ekstraktiossa esiintyneisiin ongelmiin etsin muuttamalla\nekstraktiogeometriaa. Simulaatioiden pohjalta ehdotan ratkaisuksi kasvattaa ekstraktioj\u00e4rjestelm\u00e4n\neinzel-linssin elektrodien v\u00e4limatkoja 150% nykyisest\u00e4 l\u00e4pily\u00f6ntikest\u00e4vyyden\nkasvattamiseksi. Ratkaisukeinon toimivuus pit\u00e4\u00e4 kokeellisesti testata ja\nionil\u00e4hde saattaa toimivaksi, jotta se voidaan ottaa k\u00e4ytt\u00f6\u00f6n Pelletron-kiihdyttimelle.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "In this Master\u2019s thesis I study new microwave ion source called MicroAlphatross\nand search solutions to problems found in extraction system using ion beam simulations.\nMicroAlphatross is new negative helium ion source for Pelletron accelerator\nthat is planned to replace existing Alphatross ion source. MicroAlphatross is developed\nin University of Jyv\u00e4skyl\u00e4 and during experimental development problems\narose in extraction system by electrodes discharging. There has been effort to fix\nthis problem experimentally by improving vacuum pumping but discharging still\nhappens.\nSimulations in this thesis are done via IBSimu ion beam simulation library. In\nsimulations I study ion tracks, beam current and beam emittance. I search solution\nto the discharging problem by changing extraction system geometry. Simulations\nsupport my suggestion to increase distance between electrodes in extraction einzel\nlens to 150% of current distance. Effectiveness of my solution suggestion must be\ntested experimentally, and ion source needs to be prepared for use in Pelletron\naccelerator.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2020-12-07T13:26:34Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2020-12-07T13:26:34Z (GMT). No. of bitstreams: 0\n Previous issue date: 2020", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "75", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "negatiivinen ionil\u00e4hde", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "heliumin varauksenvaihto", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "MicroAlphatrossmikroaaltoionil\u00e4hde ja sen ekstraktion tutkiminen simulaatioiden avulla", "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-202012076947", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "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": "Fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "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.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": "4021", "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": "simulointi", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "suihkut", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "ionit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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