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MS: Fachverband Massenspektrometrie
MS 10: Accelerator Mass Spectrometry and Applications 2
MS 10.4: Vortrag
Mittwoch, 25. März 2015, 18:00–18:15, PH/HS2
An ion beam cooler for negatively charged atomic and molecular ions — •Johanna Pitters1, Oliver Forstner2, Yuan Liu3, Martin Martschini1, Tobias Moreau1, Alfred Priller1, Peter Steier1, and Robin Golser1 — 1VERA Laboratory, University of Vienna, Faculty of Physics, Austria — 2Friedrich-Schiller-Universität, Jena, Germany — 3ORNL Oak Ridge National Laboratory, Tennessee, USA
A major challenge in AMS (Accelerator Mass Spectrometry) is the suppression of stable isobars that interfere with the radioisotope of interest. Laser photodetachment of negative atomic or molecular ions can be used for suppression of these isobars, provided that the detachment energy of the radioisotope of interest is higher than that of the unwanted isobar. By overlapping the negative ion beam with a high intensity laser beam of appropriate wavelength, the unwanted isobar can be neutralized. To extend the laser-ion interaction time, the ions are decelerated in a gas-filled radiofrequency quadrupole where the beam is cooled down to thermal energies by collisions with He buffer gas.
Such a cooler system for 30 keV negative ion beams is being realized as an extension to the AMS facility VERA (Vienna Environmental Research Accelerator) at the University of Vienna.
In this talk, we will give a detailed description of the cooler and present the latest experimental results concerning the transmission of the ion beam through the cooler system and the efficiencies of buffer gas cooling and laser photodetachment.