Based on a feasibility- and concept study conducted at ETH in the context of the PhD thesis of Sascha Maxeiner, it was found that it is possible to build a very compact multi-isotope AMS instrument dedicated to measure 10Be, 14C, 26Al, 41Ca (biomed applications), 129I and actinides. The new system combines the accelerator and ion source technology of the MICADAS system  with the concept of the high-energy spectrometer layout of the 600 kV TANDY facility at ETH .
With a footprint of only 3.5 x 7 m2, the space requirements of this new AMS facility are very low. The accelerator is based on the MICADAS design, but has been upgraded to support up to 300 kV. Such a vacuum insulated prototype accelerator was already in operation and has been tested for all isotopes in combination with the existing ETH Tandy spectrometer and ion source. The test results indicated that similar performance can be expected as provided by the existing Tandy system [4-9].
The low energy spectrometer of the new instrument comprises an achromatic combination of a 90° electrostatic and magnetic deflector. The layout of the high energy side is inspired by the TANDY spectrometer (90° magnetic, 120° electrostatic and 110° magnetic deflector). A quadrupole triplet right after the accelerator unit guarantees similar ion optical conditions for the different isotopes measured on this machine. Based on developments made at ETH, a new improved low noise DE-Eres gas ionization chamber is mounted on the back end for the identification of interfering particles [1, 10].
A first prototype will go into operation by the end of 2017 and Ionplus is planning to manufacture such multi-isotope AMS instruments in the future.
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|||H. A. Synal, M. Stocker and M. Suter, MICADAS: A new compact radiocarbon AMS system. NIM B, 259 (1) (2007), p. 7-13.|
T. Schulze-König, M. Seiler, M. Suter, L. Wacker, The dissociation of 13CH and 12CH2 molecules in He and N2 at beam energies of 80-250 keV and possible implications for radiocarbon mass spectrometry. NIM B, 269 (2011), p. 34-39
M. Christl, N. Casacuberta, J. Lachner, S. Maxeiner, C. Vockenhuber, H.-A. Synal, I. Goroncy, J. Herrmann, A. Daraoui, C. Walther, R. Michel, Status of 236U analyses at ETH Zurich and the distribution of 236U and 129I in the North Sea in 2009, NIM B 361 (2015), p. 510-516