The SPES laser ion source: Time structure, laser enhancement and efficiency measurements with gallium at ISOLDE Offline 2

Khwairakpam, O.S.; Mancheva, R.; Au, M.; Bernerd, C.; Centofante, L.; Chrysalidis, K.; Crepieux, B.; Fedosseev, V.N.; Heinke, R.; Marchi, T.; Mariotti, E.; Marsh, B.A.; Monetti, A.; Nicolosi, P.; Rothe, S.; Scarpa, D.; Schuett, M.; Stora, T.; Andrighetto, A.; Manzolaro, M.

doi:10.1016/j.nimb.2024.165249

Nuclear Instruments and Methods in Physics Research Section B:

2024

DOI: 10.1016/j.nimb.2024.165249

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The SPES laser ion source: Time structure, laser enhancement and efficiency measurements with gallium at ISOLDE Offline 2

O.S. Khwairakpam,

R. Mancheva,

M. Au

et al.

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The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm⁺ beam

Khwairakpam,

Mancheva,

et al. 2024

J. Phys.: Conf. Ser.

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A two-step resonance photo-ionization scheme has been used to ionize samarium atoms in the SPES tantalum hot-cavity ion source. The effect of the ion load on the ion beam time structure and the laser enhancement of the ion yield has been studied at different ion source temperatures. Generally, the introduction of more positive ions (ion load) affects negatively the overall confinement of the laser ions inside the volume of the ion source. Possible enhancement of the laser ion confinement through the introduction of neutrals is observed as well. The ion load is also observed to affect the confinement in the transfer line much more than in the hot cavity. Measurement of the time structure with inverted polarity of the cavity DC heating supply confirmed the significance of the longitudinal potential for ion extraction. The laser enhancements of the ion yield are found to be sensitive to the ion load at low operating temperature of the ion source i.e. 1800°C, whereas at 2050°C and 2200°C, they are relatively stable till an ion load value of 1.2 µA.

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The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm⁺ beam

Khwairakpam,

Mancheva,

et al. 2024

J. Phys.: Conf. Ser.

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Towards a precise measurement of ¹⁵⁷Tb nuclear decay data: Sample purification using resonance ionization mass spectrometry

Studer,

Schumann,

Chiera

et al. 2024

J. Inst.

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In nuclear physics, 157Tb emerges as a prime candidate for experiments aimed at elucidating neutrino mass constraints and at searching for sterile neutrinos. Despite its importance, 157Tb exhibits highly uncertain values for its nuclear decay properties. A significant challenge in many efforts to measure such data lies in the simultaneous undesired presence of 158Tb in the samples, which hinders precise activity determination. Mass separation emerges as a crucial method for obtaining pure 157Tb specimens. This work outlines the production of an isotopically-pure 157Tb sample through mass separation and ion implantation, using the RISIKO facility at the University of Mainz. The initial material was obtained from proton-irradiated Ta samples through radiochemical separation at the Paul Scherrer Institute. In total, a sample containing 8.7(9) · 1012 atoms of 157Tb was obtained. The efficiency of the mass separation and ion implantation was 13(2) %. The purified material served as the basis for new research endeavors at the Physikalisch Technische Bundesanstalt Braunschweig aiming at the determination of nuclear data for 157Tb with significantly improved precision.

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The SPES laser ion source: Time structure, laser enhancement and efficiency measurements with gallium at ISOLDE Offline 2

Cited by 2 publications

References 29 publications

The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm⁺ beam

The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm⁺ beam

Towards a precise measurement of ¹⁵⁷Tb nuclear decay data: Sample purification using resonance ionization mass spectrometry

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The SPES laser ion source: Time structure, laser enhancement and efficiency measurements with gallium at ISOLDE Offline 2

Cited by 2 publications

References 29 publications

The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm+ beam

The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm+ beam

Towards a precise measurement of 157Tb nuclear decay data: Sample purification using resonance ionization mass spectrometry

Contact Info

Product

Resources

About

The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm⁺ beam

The SPES Laser Ion Source: Time Structure and Laser Enhancement Measurements with Sm⁺ beam

Towards a precise measurement of ¹⁵⁷Tb nuclear decay data: Sample purification using resonance ionization mass spectrometry