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dc.contributor.authorReponen, Mikael
dc.date.accessioned2012-10-26T06:44:47Z
dc.date.available2012-10-26T06:44:47Z
dc.date.issued2012
dc.identifier.isbn978-951-39-4785-9
dc.identifier.otheroai:jykdok.linneanet.fi:1233253
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/40096
dc.description.abstractThe work presented in this thesis concentrates on the development of the FURIOS laser ion source towards e cient and selective production of low energy radioactive ion beams. This includes design and development of the ion guide and hot cavity catcher systems for laser ion source use, and the development of in-source and in-jet laser spectroscopy techniques. The work has been carried out at the IGISOL facility in the Accelerator laboratory of the University of Jyväskylä. The FURIOS facility was upgraded and developed during the move to the IGISOL-4 facility. The laser transport was greatly improved in order to allow a large fraction of the initial laser intensity to be transported into the gas cell at the IGISOL-4 frontend. The careful design of the IGISOL frontend and the FURIOS facility enable the laser ion source to be utilized e ciently for the production of radioactive ion beams at IGISOL-4. Additionally, in order to overcome the de ciencies of the standard IGISOL ion guide design under on-line conditions, an ion guide based on an original design by the LISOL group in Leuven has been adapted the IGISOL. The shadow gas cell allows e cient resonance laser ionization in a gas cell under on-line conditions. The transport e ciency of the ion guide was determined using recoil source. Additionally, the principal operation of the ion guide was demonstrated under pseudo-on-line conditions utilizing resonance laser ionization. An inductively heated hot cavity catcher laser ion source was developed based on existing electron bombardment heated thermal ionizer design in collaboration with the JYFL ECR group. The motivation behind the development of a new type of recoil catcher at IGISOL is the production of rare isotope of silver, N=Z 94Ag. The evacuation time for the silver atoms from the catcher was measured to be less than 10 ms at a relatively low temperature of 1200 C. Though the hot cavity catcher ion source principle was demonstrated, the commissioning experiment showed the need to further develop the catcher in order to improve the beam quality and ionization e ciency. Lastly, in gas-jet spectroscopy in the form of the LIST approach was studied. Different ion guide nozzles were compared in order to nd a nozzle that would produce long collimated gas jets for the use of the LIST approach. A de Laval type nozzle was found out to be the most promising, being able to produce a well collimated jet spanning a distance of 14 cm. The jet temperature was measured to be very low, which when combined with the low pressure, makes a very attractive environment for laser spectroscopy.fi
dc.format.extentverkkoaineisto (142 sivua).
dc.language.isoeng
dc.publisherUniversity of Jyväskylä
dc.relation.ispartofseriesResearch report / Department of Physics, University of Jyväskylä
dc.subject.otherNuclear physics
dc.subject.otherIGISOL
dc.subject.otherLaser resonance ionization
dc.subject.otherIon guide
dc.subject.otherLaser spectroscopy
dc.subject.otherlaserresonanssi-ionisaatio
dc.subject.otherioniohjain
dc.subject.otherlaserspektroskopia
dc.titleResonance laser ionization developments for IGISOL-4
dc.typeDiss.fi
dc.identifier.urnURN:ISBN:978-951-39-4785-9
dc.type.dcmitypeTexten
dc.type.ontasotVäitöskirjafi
dc.type.ontasotDoctoral dissertationen
dc.contributor.tiedekuntaMatemaattis-luonnontieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Mathematics and Scienceen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän yliopistofi
dc.contributor.oppiaineFysiikkafi
dc.relation.issn0075-465X
dc.relation.numberinseriesno. 8/2012
dc.rights.accesslevelopenAccessfi
dc.subject.ysoydinfysiikka
dc.subject.ysoionit
dc.subject.ysolaserit
dc.subject.ysospektroskopia
dc.subject.ysoionisoiva säteily


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