Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Poster

MS 8.8: Poster

Donnerstag, 11. März 2010, 16:00–18:00, Lichthof

Commissioning of the double Penning trap system MLLTRAP and first studies on mass-dependent systematic uncertainties* — •Kevin Krug¹, Christine Weber¹, Peter G. Thirolf¹, Jerzy Szerypo¹, Veli Kolhinen^1,2, Eva Gartzke¹, and Dietrich Habs¹ — ¹Fakultät für Physik, LMU München — ²Department of Physics, University of Jyväskylä

The cylindrical double Penning trap system MLLTRAP in its commissioning phase at the Maier-Leibnitz-Laboratory (MLL) Tandem accelerator in Garching is designed to perform high-accuracy mass measurements on fusion-reaction products. As the mass uncertainty is inversely proportional to the ionic charge state, the ions of interest will be charge bred prior to injection into the Penning trap system. In the future setup, both traps are foreseen to be operated as measurement traps with a relative homogeneity of the magnetic field at the trapping sites of Δ B/B ≤ 0.3 ppm. In the commissioning phase, an offline surface ionization source is used for iterative optimization of the apparatus and studies on mass-dependent systematic uncertainties. Mass measurements via the time-of-flight ion cyclotron resonance method (TOF-ICR) of reference ions with well-known masses (⁸⁵Rb, ⁸⁷Rb, ³⁹K, ¹³³Cs) were carried out to analyze mass-dependent systematic effects. Together with previous studies on the uncertainty due to magnetic-field fluctuations the current status with respect to the limits of mass accuracy of the apparatus will be presented.

* Supported by DFG under contract HA 1101/14-1 and by Maier-Leibnitz-Laboratory,Garching.