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Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.84: Poster

Dienstag, 28. März 2017, 16:45–18:45, F Foyer

A laser ablation carbon cluster ion source for MR-TOF-MS — •Christine Hornung1, Timo Dickel1,2, Hans Geissel1,2, Florian Greiner1, Wolfgang Plaß1,2, Ann-Kathrin Rink1, and Christoph Scheidenberger1,21Justus-Liebig Universität Gießen, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

The FRS Ion Catcher at GSI serves as test facility for the future Low-Energy Branch of the Super-FRS at FAIR. Here, short-lived nuclei produced and in-flight separated in the FRS and thermalized in a cryogenic stopping cell and identified and measured with high accuracy in a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS).

For calibration and systematic studies of the MR-TOF-MS calibrants over a broad mass range and close to the ions of interest are essential. For this purpose a new diagnostics unit including a laser ablation carbon cluster ion source and a dedicated RFQ mass filter has been designed, commissioned and tested. The system can be operated at repetition rates that are two orders of magnitude higher (100 Hz) than existing systems and is thus ideally suited for the needs of the MR-TOF-MS (cycle frequency ∼100 Hz). Several measures (small laser spot size, special ion optics, x-y-movable targettable) have been taken into account to ensure long term stable operation (∼weeks) at the highest repetition rate. Results of the commissioning and first tests with different targets will be presented.

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