Low Energy AMS: How to reach 50kyrs with 50 kV
Hans-Arno Synal1, Daniele De Maria1, Lukas Wacker1, Sascha Maxeiner2, Andreas Herrmann2
1ETH Zurich, Zurich, Switzerland, 2Ionplus AG, Dietikon, Switzerland
The technical evolution of Accelerator Mass Spectrometry (AMS) instrumentation over the last ten years has boosted research with radioactive tracers in global environment. The by far most important AMS nuclide is radiocarbon. Here, dedicated high performing instruments like the MICADAS system will cover the needs of a wide user community to get reliable isotopic ratio measurements with uncertainties in the range of 10 – 20 radiocarbon years. In many cases, not the instrumental capabilities are the dominating source of final uncertainties, but rather the external sample handling and preparation process. Although such instrumentation fulfils the user needs, there is still a potential to further develop the measurement technology to finally build instruments which are even more compact, less expensive, more user friendly, and maybe tailored to specific application needs. In collaboration with Ionplus AG we have set-up a miniaturized version of a radiocarbon detection system called LEA (Low Energy AMS). It follows basic MICADAS design principles but operate at a terminal voltage of 50 kV only. A prototype system has been finalized in 2019 and performance measurements have been conducted. Initial results of these experiments are presented.
Head of ETH Zurich Laboratory of Ion Beam Physics