Hannover 2020 – wissenschaftliches Programm
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MS 9.4: Poster
Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof
Gas filled magnet for isobar separation for use with a 5.0 MV Tandetron AMS system — •Matthias Klein, Dirk Mous, Nicolae Podaru, and Guillermo Dominguez — High Voltage Engineering Europa B.V., Amersfoort, The Netherlands
AMS Measurements of 26Al are presently done using Al- extraction from the ion source at the 5.0 MV Tandetron AMS system at CEREGE, France. Extraction of AlO- increases the usable source output by about an order of magnitude, allowing a higher measurement throughput. However, isobaric 26Mg from MgO- injection forms an interference that must be reduced for avoiding overload of the final detector. For this purpose, a gas-filled magnet (GFM) will be connected to the existing high-energy spectrometer. It separates Al and Mg ions based on their different characteristics regarding average charge state and energy loss. The mass-energy product of the GFM is sufficiently high for supporting measurements of 36Cl and reduction of 36S as well. The magnet is followed directly by a multi-anode gas ionization chamber with a large entrance window, allowing as much as possible of the Al beam which has increased in size due to angular straggling by passage through the gas. In this contribution we will present the design and the specification details of this GFM detection system.