Rostock 2019 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 9: Resonance Ionization Mass Spectrometry
MS 9.2: Vortrag
Donnerstag, 14. März 2019, 14:30–14:45, U A-Esch 2
On-line results from ISOLDE’s Laser Ion Source and Trap LIST — •Reinhard Heinke1, Valentin Fedosseev2, Bruce Marsh2, Sebastian Raeder3, Sebastian Rothe2, and Klaus Wendt1 — 1Institute of Physics, JGU Mainz — 2EN Department, CERN — 3HIM Mainz
Laser resonance ionization today is a well-established core technique for efficient and highly selective radioactive ion beam production at the worldwide leading facilities. Nevertheless, in experiments demanding highest beam purity, suppression of beam contaminations from competing ionization processes inside the hot ion source cavity is essential. Corresponding techniques therefore imply spatial separation of the high temperature atomization region from a fully shielded clean and cold laser ionization volume located inside an RFQ ion guide structure: The Laser Ion Source and Trap LIST.
Derived from previous operation experiences, systematic off-line studies and simulations, a next generation of the LIST went on-line at ISOLDE in 2018. Highly pure 22Mg beams were provided for measurements on its super-allowed branching ratio and half-life. Exceptional contamination suppression of up to a factor of 106 was shown. Moreover, the LIST unit undergoes additional tests to eventually further increase its performance: Using high-resistance cavity materials and a LIST body of well adapted length as field-free drift volume also enables time-of-flight operation mode with shortest ion bunches and offers the possibility for subsequent beam purification by laser pulse synchronized ion beam gating. Implementation at ISOLDE is in progress.