Mainz 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 64: Instrumentation

HK 64.1: Gruppenbericht

Freitag, 23. März 2012, 14:00–14:30, P 2

First Online Test of the Cryogenic Stopping Cell for the Super-FRS at the FRS Ion Catcher at GSI — •Timo Dickel — Justus-Liebig-Universität Gießen — GSI, Darmstadt

At the FRS, GSI, exotic nuclei can be produced and separated. After production and separation of the nuclei of interest, they are slowed down from relativistic energies and are thermalized to a few eV with a cryogenic gas-filled stopping cell. To achive high stopping efficiencies, the cryogenic stopping cell is operated at highest densities (5 mg/cm²). This is possible due to the use of a fine structured RF carpet (4 electrodes per mm). After extraction from the cryogenic stopping cell the ions are guided through an RF quadrupole system to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). The MR-TOF-MS is used for high precision mass measurements (δ m/ m ≈  10⁻⁷), to remove isobaric contaminants from the ions of interest and as a broadband mass spectrometer to investigate and optimize the operation of the stopping cell and the range bunching. Results from the first online test of the FRS-Ion-Catcher, such as the highly efficient stopping and extraction of ²²³Th, will be shown.