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[{"key": "dc.contributor.author", "value": "Toivanen, Ville", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2022-04-05T10:41:08Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2022-04-05T10:41:08Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2013", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.isbn", "value": "978-951-39-5287-7", "language": null, "element": "identifier", "qualifier": "isbn", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/80491", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "This thesis presents the results of a broad study investigating di\ufb00erent possibilities\r\nto improve the performance of the JYFL 14 GHz Electron Cyclotron Resonance Ion\r\nSource (ECRIS). The experimental work includes studies of ECRIS plasma, ion beam\r\nformation and beam transport, all of which contribute to the properties of ion beams\r\nproduced with ECR ion sources. In particular, it is shown that the degradation of beam\r\nquality due to the formation of hollow beam structure is in\ufb02uenced by phenomena\r\noriginating from all of these categories.\r\nThe e\ufb00ects of \ufb01ne tuning the frequency of the plasma heating microwaves of the JYFL\r\n14 GHz ECRIS are presented, showing that the frequency tuning can in\ufb02uence the ion\r\nbeam properties. It is demonstrated that the ion beams produced with the ion source\r\nare not completely space charge compensated during the \ufb01rst section of the beam\r\ntransport, and the space charge e\ufb00ects in this region have signi\ufb01cant impact on the\r\nbeam properties. Also, it is shown that mitigating these e\ufb00ects can lead to substantial\r\nimprovement in beam quality. The temporal stability of ion beams produced with\r\nECR ion sources is discussed and it is shown that the beams exhibit fast beam current\r\noscillations in the 102 \u2212 103 Hz region, characteristics of which depend on the ion\r\nsource tuning. Experiments with the so-called collar structure are presented, providing\r\nnew insight into the plasma conditions near the ion extraction. As a culmination of\r\nthe thesis work, a new extraction system has been designed and constructed for the\r\nJYFL 14 GHz ECRIS. It is shown that the new system provides improved performance\r\ncompared to the old one in terms of extracted beam currents, beam quality and\r\ntransmission e\ufb03ciency.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Miia Hakanen (mihakane@jyu.fi) on 2022-04-05T10:41:08Z\r\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2022-04-05T10:41:08Z (GMT). No. of bitstreams: 0\r\n Previous issue date: 2013", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.publisher", "value": "University of Jyv\u00e4skyl\u00e4", "language": null, "element": "publisher", "qualifier": null, "schema": "dc"}, {"key": "dc.relation.ispartofseries", "value": "Jyv\u00e4skyl\u00e4n yliopisto. Fysiikan laitos. Research report", "language": null, "element": "relation", "qualifier": "ispartofseries", "schema": "dc"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli I:</b> Toivanen, V., Koivisto, H., Steczkiewicz, O., Celona, L., Tarvainen, O., Ropponen, T., Gammino, S., & Ciavola, G. (2010). Effect of ECR ion source frequency tuning on ion beam intensity and quality at Department of Physics, University of Jyv\u00e4skyl\u00e4. <i>Review of Scientific Instruments, 81, 02A319.</i> DOI: <a href=\"https://doi.org/10.1063/1.3267287\"target=\"_blank\"> 10.1063/1.3267287</a>", "language": null, "element": "relation", "qualifier": "haspart", "schema": "dc"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli II:</b> Toivanen, V., Koivisto, H., Steczkiewicz, O., Celona, L., Tarvainen, O., Ropponen, T., Gammino, S., Mascali, D., & Ciavola, G. (2011). Erratum: Effect of electron cyclotron resonance ion source frequency tuning on ion beam intensity and quality at Department of Physics, University of Jyvaskyla (vol 81, 02A319, 2010). <i>Review of Scientific Instruments, 82(2), 29901.</i> DOI: <a href=\"https://doi.org/10.1063/1.3541812\"target=\"_blank\"> 10.1063/1.3541812</a>", "language": null, "element": "relation", "qualifier": "haspart", "schema": "dc"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli III:</b> Toivanen, V., Tarvainen, O., Lyneis, C., Kauppinen, J., Komppula, J., & Koivisto, H. (2012). Electron cyclotron resonance ion source plasma chamber studies using a network analyzer as a loaded cavity probe. <i>Review of Scientific Instruments, 83, 02A306.</i> DOI: <a href=\"https://doi.org/10.1063/1.3660818\"target=\"_blank\"> 10.1063/1.3660818</a>", "language": null, "element": "relation", "qualifier": "haspart", "schema": "dc"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli IV:</b> Toivanen, V., Steczkiewicz, O., Tarvainen, O., Ropponen, T., \u00c4rje, J., & Koivisto, H. (2010). The effects of beam line pressure on the beam quality of an electron cyclotron resonance ion source. <i>Nuclear Instruments and Methods in Physics Research Section B, 268, 1508.</i> DOI: <a href=\"https://doi.org/10.1016/j.nimb.2010.01.016\"target=\"_blank\"> 10.1016/j.nimb.2010.01.016</a>", "language": null, "element": "relation", "qualifier": "haspart", "schema": "dc"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli V:</b> Toivanen, V., Tarvainen, O., Komppula, J., & Koivisto, H. (2013). Oscillations of ECR ion source beam current along the beam transport of the JYFL K-130 cyclotron. <i>Journal of Instrumentation, 8(2), Article T02005.</i> DOI: <a href=\"https://doi.org/10.1088/1748-0221/8/02/T02005\"target=\"_blank\"> 10.1088/1748-0221/8/02/T02005</a>", "language": null, "element": "relation", "qualifier": "haspart", "schema": "dc"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli VI:</b> Toivanen, V., Tarvainen, O., Komppula, J., & Koivisto, H. (2013). The effect of plasma electrode collar structure on the performance of the JYFL 14 GHz electron cyclotron resonance ion source. <i>Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 726, 41-46.</i> DOI: <a href=\"https://doi.org/10.1016/j.nima.2013.05.153\"target=\"_blank\"> 10.1016/j.nima.2013.05.153</a>", "language": null, "element": "relation", "qualifier": "haspart", "schema": "dc"}, {"key": "dc.relation.haspart", "value": "<b>Artikkeli VII:</b> Toivanen, V., Kalvas, T., Koivisto, H., Komppula, J., & Tarvainen, O. (2013). Double einzel lens extraction for the JYFL 14 GHz ECR ion source designed with IBSimu. <i>Journal of Instrumentation, 8(5), Article P05003.</i> DOI: <a href=\"https://doi.org/10.1088/1748-0221/8/05/P05003\"target=\"_blank\"> 10.1088/1748-0221/8/05/P05003</a>", "language": null, "element": "relation", "qualifier": "haspart", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": null, "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.title", "value": "Studies of electron cyclotron resonance ion source beam formation, transport and quality", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "doctoral thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:ISBN:978-951-39-5287-7", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "V\u00e4it\u00f6skirja", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Doctoral dissertation", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Mathematics and Science", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_db06", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.relation.issn", "value": "0075-465X", "language": null, "element": "relation", "qualifier": "issn", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "doctoralThesis", "language": null, "element": "type", "qualifier": "publication", "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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