Study of low work function materials for hot cavity resonance ionization laser ion sources

Schwellnus, F.; Catherall, R.; Crepieux, B.; Fedosseev, V. N.; Marsh, B. A.; Mattolat, C.; Menna, M.; Österdahl, Fabian; Raeder, S.; Stora, T.; Wendt, Κ.

doi:10.1016/j.nimb.2009.02.068

Cited by 36 publications

(15 citation statements)

References 17 publications

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“…One straightforward improvement is to employ materials with a low work function for the hot cavity other than the routinely used tungsten at high temperature. Such materials were tested very recently by Schwellnus et al [88]. Another solution called laser ion source trap (LIST), a combination of a laser ion source with an ion trap, was proposed by Blaum et al [89] quite some time ago.…”

Section: Trends and Future Directionsmentioning

confidence: 99%

Atomic physics techniques for studying nuclear ground state properties, fundamental interactions and symmetries: status and perspectives

Kluge

2010

Hyperfine Interact

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The international workshop on "Application of Lasers and Storage Devices in Atomic Nuclei Research" held during 2009 in Poznan gave an excellent overview on the latest experimental and theoretical results regarding the investigation of radionuclides by atomic physics techniques and the extraction of ground state properties of exotic nuclei. This publication intends to summarize the progress recently achieved by laser spectroscopy and mass spectrometry as well as by weak interaction studies using atomic physics techniques. Furthermore, it tries to point to some areas requiring urgent improvements and to indicate some routes of future research and challenging opportunities.

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Section: Trends and Future Directionsmentioning

confidence: 99%

Atomic physics techniques for studying nuclear ground state properties, fundamental interactions and symmetries: status and perspectives

Kluge

2010

Hyperfine Interact

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“…In addition the isobar purity can be further enhanced if the RILIS is used in conjunction with surface ion suppression methods, e.g. reduced ion source temperatures, fast beam gating [10,11], low work function cavities [12] or the Laser Ion Source Trap (LIST) [13]. Presently several resonance laser ionization schemes for europium exist, making use of either three step schemes [14] or two step schemes [15].…”

Section: Introductionmentioning

confidence: 99%

Resonance ionization scheme development for europium

et al. 2017

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Odd-parity autoionizing states of europium have been investigated by resonance ionization spectroscopy via two-step, two-resonance excitations. The aim of this work was to establish ionization schemes specifically suited for europium ion beam production using the ISOLDE Resonance Ionization Laser Ion Source (RILIS). 13 new RILIS-compatible ionization schemes are proposed. The scheme development was the first application of the Photo Ionization Spectroscopy Apparatus (PISA) which has recently been integrated into the RILIS setup.

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“…However, the elements with a low ionization energy (IE) (e.g., 87 Fr, 88 Ra) are surface ionized at the walls of the hot cavity alongside the laser-ionization process. Attempts to suppress the surface ions through the use of low-work-function cavity materials [22] or the pulsed-release technique [23] have been successfully applied in cases where only moderate selectivity enhancement is sufficient (e.g., for 215 ≤ A ≤ 218 [9][10][11][12][13]). In the case of 219 Po, however, the RILIS-ionized polonium beam is typically contaminated with 10 5 times more francium if ionization takes place inside a surface-ion-source cavity.…”

Section: Introductionmentioning

confidence: 99%

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

Fink¹,

Cocolios²,

Andreyev³

et al. 2015

Phys. Rev. X

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A Laser Ion Source and Trap (LIST) for a thick-target, isotope-separation on-line facility has been implemented at CERN ISOLDE for the production of pure, laser-ionized, radioactive ion beams. It offers two modes of operation, either as an ion guide, which performs similarly to the standard ISOLDE resonance ionization laser ion source (RILIS), or as a more selective ion source, where surface-ionized ions from the hot ion-source cavity are repelled by an electrode, while laser ionization is done within a radiofrequency quadrupole ion guide. The first physics application of the LIST enables the suppression of francium contamination in ion beams of neutron-rich polonium isotopes at ISOLDE by more than 1000 with a reduction in laser-ionization efficiency of only 20. Resonance ionization spectroscopy is performed directly inside the LIST device, allowing the study of the hyperfine structure and isotope shift of 217 Po for the first time. Nuclear decay spectroscopy of 219 Po is performed for the first time, revealing its half-life, α-to-β-decay branching ratio, and α-particle energy. This experiment demonstrates the applicability of the LIST at radioactive ion-beam facilities for the production and study of pure beams of exotic isotopes.

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Study of low work function materials for hot cavity resonance ionization laser ion sources

Cited by 36 publications

References 17 publications

Atomic physics techniques for studying nuclear ground state properties, fundamental interactions and symmetries: status and perspectives

Atomic physics techniques for studying nuclear ground state properties, fundamental interactions and symmetries: status and perspectives

Resonance ionization scheme development for europium

In-Source Laser Spectroscopy with the Laser Ion Source and Trap: First Direct Study of the Ground-State Properties ofPo217,219

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