Mainz 2017 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Accelerator Mass Spectrometry and Applications I
MS 6.4: Vortrag
Mittwoch, 8. März 2017, 15:30–15:45, RW 2
Modification of the 120 ∘ Bending Magnet at the CologneAMS as Gas-Filled-Magnet — •Richard Altenkirch, Claus Feuerstein, Markus Schiffer, Stefan Heinze, Claus Müller-Gatermann, and Alfred Dewald — Institute for Nuclear Physics, University of Cologne, Germany
Routine measurements of the last years at the 6 MV AMS system showed a good isobar suppression for all Isotopes, measured with the Degrader-Foil-Method, especially 36 Cl and 9 Be. However, the efficiency is reduced due to the charge state distribution by this technique.
For measurements with atomic 26 Al the efficiency is limited by the low beam output of the ion source. In the case of AlO the output is larger by the factor of 10. In this case the suppression of 26 Mg will become necessary.
In order to minimize efficiency losses for 9 Be, 26 Al and 36 Cl measurements the 120 ∘ magnet at the 6 MV AMS system was modified to enable a Gas-Filled-Operation, under the special condition to keep the equipment for the degrader-foil technique untouched.
Besides constructional steps, first results for 26 Al and 36 Cl beams will be presented. This includes beam broadening and isobar separation as a function of the gas pressure. The measured data will be compared to Monte Carlo simulations.
A new designed multi-wire chamber in combination with an ionisation chamber will be presented.