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MS: Fachverband Massenspektrometrie

MS 8: Accelerator Mass Spectrometry and Applications I

MS 8.1: Hauptvortrag

Mittwoch, 11. März 2020, 14:30–15:00, f128

The new compact, multi isotope AMS system (MILEA) at ETH Zurich - performance and applications — •Marcus Christl¹, Sascha Maxeiner², Arnold Milenko Müller², Philip Gautschi¹, Christof Vockenhuber¹, Maxi Castrillejo¹, Nuria Casacuberta¹, and Hans-Arno Synal¹ — ¹Laboratory of Ion Beam Physics, ETH Zurich, Switzerland — ²Ionplus AG, Dietikon, Switzerland

The prototype version of a new, compact, multi-isotope, low energy accelerator mass spectrometry system (MILEA) was built in collaboration with Ionplus AG and set into operation at ETH Zurich in 2018. The system is based on a 300 kV power supply and was optimized for small footprint (3.5 x 7 m²) and to reach optimal performance for ¹⁰Be, ¹⁴C, ²⁶Al, ¹²⁹I, and actinide measurements at low energies. During the past year the system was thoroughly tested and is now starting to be used for routine AMS operations. In the first part of the presentation, the layout of the system, its ion optical properties and the setup for the different nuclides will be presented. The performance of the system with respect to ion currents, over-all transmission and background will be discussed for the different nuclides. In the second part of the talk most recent results of our actinide and heavy ion program will be presented. The results include some new data measured on MILEA which shows superior performance compared to our 500 kV Tandy system. In the application part new data from the distribution of ²³⁶U and ¹²⁹I in the ocean as well as a ²³⁶U/²³⁸U record from sea shells from the Northeast Atlantic Ocean will be presented.