A1 Journal article (refereed)
Gas cell studies of thorium using filament dispensers at IGISOL (2020)


Pohjalainen, I., Moore, I., Geldhof, S., Rosecker, V., Sterba, J., & Schumm, T. (2020). Gas cell studies of thorium using filament dispensers at IGISOL. Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms, 484, 59-70. https://doi.org/10.1016/j.nimb.2020.08.012


JYU authors or editors


Publication details

All authors or editors: Pohjalainen, Ilkka; Moore, Iain; Geldhof, Sarina; Rosecker, V.; Sterba, J.; Schumm, T.

Journal or series: Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms

ISSN: 0168-583X

eISSN: 1872-9584

Publication year: 2020

Volume: 484

Pages range: 59-70

Publisher: Elsevier

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.nimb.2020.08.012

Publication open access: Not open

Publication channel open access:


Abstract

Filament-based dispensers of thorium have been investigated at the IGISOL facility, Jyväskylä, for potential use as a thorium ion source for future collinear laser spectroscopy experiments. Several different filaments were manufactured in the Institute of Atomic and Subatomic Physics of TU Wien, with 232Th and 229Th prepared on tantalum substrates either by drying thorium nitrate solution or via molecular plating, while adding a layer of zirconium for oxide reduction. The filaments were characterized in a helium-filled gas cell by performing selective and efficient in-gas-cell resonance laser ionization and by analyzing the resulting ion beams by mass spectrometry. Additionally, the in-gas-cell laser ionization process of thorium was further characterized by wavelength scans, saturation measurements and by recording the temporal behavior of extracted ion pulses. Although an ion source was successfully created with mass-separated intensities over ions/s, the required high filament temperature resulted in significant contributions from interfering impurities and deterioration of the filament structure.


Keywords: nuclear physics; research equipment; ions; thorium

Free keywords: ion source; thorium; resonance laser ionization; gas cell


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Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1


Last updated on 2021-07-07 at 21:30