Hannover 2016 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 11: Accelerator Mass Spectrometry and Applications III

MS 11.1: Hauptvortrag

Freitag, 4. März 2016, 11:00–11:30, f128

Accelerator Mass Spectrometry at AARAMS — •Jesper Olsen — Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark

The new multi-element AMS system installed at the Aarhus University AMS Centre, Department of Physics and Astronomy has now been extensively tested, especially for 14C, 10Be, and 26Al.

The system is the latest extended compact design manufactured by High Voltage Engineering Europa B.V. and based on a 1 MV Tandetron accelerator with a dual gas system (Ar and He) for the terminal stripper to investigate possible increased charge exchange efficiency for e.g. actinides. The injector is equipped with two independently operating ion sources and a 120 deg. bouncer magnet with high resolution and a bending power of 340 amu at 35 keV, supporting the measurements of actinides. The high-energy (HE) spectrometer features a degrader foil for isobar suppression and a second HE magnet for suppression of ions scattered in the HE ESA. The control system supports different methods for isotope switching: *traditional* fast bouncing, adjusting the Hall-probe controlled magnet fields (for e.g. 3H) or changing the complete set of operation parameters (e.g. for actinides).

During the on-site acceptance tests, the following background levels were measured: < 10-16 for tritium, < 10-15 for 14C, < 10-15 for 10Be (down to < 10-16 in a later 3 hour run), 2*10-15 for 26Al, 2*10-13 for 129I and 9*10-12 for 41Ca and for 239Pu (240Pu) a 1.5 (0.5) pg per mg iron, which demonstrates the multi-element capability of the system.