SAMOP 2021 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 8: Accelerator Mass Spectrometry II
MS 8.2: Talk
Thursday, September 23, 2021, 14:15–14:30, H3
A new radio frequency quadrupole ion cooler for Accelerator Mass Spectrometry — •Markus Schiffer1, Oscar Marchhart2, Susan Herb1, Martin Martschini2, Robin Golser2, and Alfred Dewald1 — 1University of Cologne, Institute for Nuclear Physics, Germany — 2University Vienna, Faculty of Physics, Vienna Environmental Research Accelerator (VERA), Austria
Ion Laser Interaction Mass Spectrometry (ILIAMS) has demonstrated a high isobar suppression capability for a variety of radionuclides by selective laser photodetachment of decelerated ion beams in a gas-filled radio frequency quadrupole cooler (RFQ). Furthermore, the admixture of O2 gas to the helium buffer gas has revealed an impressively high isobar suppression, larger 105 in the case of 90Sr/90Zr, at the Vienna Environmental Research Accelerator (VERA), even without the use of the laser. Therefore, we started to develop a radio frequency quadrupole cooler designed for the deceleration and trapping of ion beams with high beam emittance like heavy molecular anions, e.g. 90SrF3. The new ion cooler will be used with gas reactions and is intended to be improved by the addition of a laser in a later phase. This contribution will present details of the RFQ, like the ion optic calculation of the injection electrodes and the guiding field. Different guiding field structures will be compared by the calculation of multipole expansion coefficients. Additionally, a radio frequency resonance tuning and impedance matching system for heavy radionuclide applications will be presented.