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MS: Fachverband Massenspektrometrie

MS 1: Accelerator Mass Spectrometry I

MS 1.3: Vortrag

Dienstag, 7. März 2023, 11:45–12:00, F128

Status of the advanced radiofrequency quadrupole for AMS - first results from the test bench setup of VERA — •Oscar Marchhart^1,2, Markus Schiffer³, Alfred Priller¹, Susan Herb³, Peter Steier¹, Gereon Hackenberg³, Martin Martschini¹, Dennis Mücher³, Alfred Dewald³, and Robin Golser¹ — ¹University of Vienna, Faculty of Physics, Isotope Physics, Vienna, Austria — ²University of Vienna, Vienna Doctoral School in Physics, Vienna, Austria — ³University of Cologne, Institute for Nuclear Physics, Cologne, Germany

Accelerator Mass Spectrometry (AMS) is the most sensitive method for the detection of trace amounts of long-lived radionuclides. The Ion-Laser InterAction Mass Spectrometry (ILIAMS) setup at the Environmental Research Accelerator (VERA) has demonstrated great isobar suppression capabilities using laser photodetachment in a gas-filled radiofrequency quadrupole (RFQ). With the ILIAMS technique, new AMS isotopes for research on environmental radioactivity (⁹⁰Sr, ¹³⁵Cs) and astrophysics (¹⁸²Hf) become accessible.
An advanced RFQ ion cooler based on ILIAMS has been developed and built. Its performance is currently being studied at the test bench setup of VERA. The new design consists of elliptically shaped injection and extraction electrodes and a new guiding field structure that uses hybrid-electrodes. These changes intend to solve the technical challenges of decelerating and trapping ion beams with high emittance which typically arise when using fluoride anions like SrF₃⁻ and result in significant transmission losses up to 90%.