Mainz 2017 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 9: Accelerator Mass Spectrometry and Applications II

MS 9.6: Talk

Thursday, March 9, 2017, 15:45–16:00, RW 2

New and upgraded ionization chambers for AMS at HIAF — •Martin Martschini, Keith Fifield, Michaela Froehlich, Stefan Pavetich, Stephen Tims, and Anton Wallner — Department of Nuclear Physics, The Australian National University, ACT 2601, Australia

Radionuclides measured by Accelerator Mass Spectrometry at the Heavy Ion Accelerator Facility (HIAF) of the Australian National University include ¹⁰Be, ²⁶Al, ³⁶Cl, ⁵³Mn, ⁶⁰Fe, ⁹³Zr, ¹²⁹I, ²³⁶U and Pu. The 14UD pelletron accelerator provides ample energy for isobar separation using a gas-filled-magnet setup with an ENGE-split-pole spectrograph.

In order to fully exploit the isotopic and isobaric separation capabilities, three new ionization chambers are currently being designed and constructed: Two new compact ionization chambers based on similar designs to those at ETH Zurich and at VERA (Vienna) allow for measurements of actinides and other radioisotopes without atomic isobaric interferences. While one is optimized for high energy resolution, the other serves as the final energy detector in a time-of-flight setup. The third ionization chamber is a new multi-anode device optimized for the detection of ⁵³Mn after the gas-filled magnet. The design is based on simulations with Raytrace and SRIM. Last but not least, an existing ionization chamber used, e.g., for ⁹³Zr-measurements is undergoing an upgrade of detector electronics. Details of these projects and first experimental results will be discussed.