Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Instrumentierung
HK 45.6: Vortrag
Donnerstag, 20. März 2014, 15:30–15:45, HZ 10
A laser ablation carbon cluster ion source for MR-TOF-MS — •Christine Hornung1, Timo Dickel1,2, Jens Ebert1, Hans Geissel1,2, Wolfgang R. Plass1,2, Ann-Kathrin Rink1, and Christoph Scheidenberger1,2 — 1II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany — 2GSI Helmholzzentrum für Schwerionenforschung, Darmstadt, Germany
The FRS Ion Catcher at GSI is the test facility for the future Low-Energy Branch (LEB) of the Super-FRS at FAIR. It consists of the FRS, a cryogenic stopping cell and a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). At the LEB high precision mass measurements of exotic nuclei will be possible at the MATS experiment. The MR-TOF-MS is an indispensable diagnostic device for operation of the cryogenic stopping cell.
For calibration and systematic studies of the MR-TOF-MS at the FRS Ion Catcher calibrants over a broad mass range are essential. For this purpose a laser ablation carbon cluster ion source has been designed, commissioned and tested. The system can be operated at order of magnitude higher repetition rates (100Hz) than existing system and is thus ideally suited for the needs of the MR-TOF-MS (repetition rates ∼100Hz). Several measures (small laser spot size, special ion optics, x-y-movable targettable) have been taken to ensure long term stable operation (∼weeks) at highest repetition rate. Results of the commissioning and first tests with different targets will be presented.