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MS: Fachverband Massenspektrometrie

MS 3: Ion Traps, Ion Storage Rings, Molecules, Clusters, Decays and Reactions

MS 3.6: Vortrag

Montag, 29. Februar 2016, 17:15–17:30, f128

Conceptual Design of the Cryogenic Stopping Cell for the Super-FRS at FAIR. — •Ivan Miskun¹, Samuel Ayet San Andres^1,2, Timo Dickel^1,2, Hans Geissel^1,2, Fabian Heiße^1,2, Wolfgang R. Plaß^1,2, Sivaji Purushothaman², Moritz P. Reiter¹, Ann-Kathrin Rink¹, and Christoph Scheidenberger^1,2 — ¹II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Gießen, Germany — ²GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany

Gas-filled stopping cells are powerful tools used to convert high-energy ion beams to ion beams with kinetic energies of few eV. At the Low-Energy Branch of the Super-FRS at FAIR a cryogenic stopping cell (CSC) filled with ultrapure helium gas at temperature of ∼ 70 K will be used to stop, thermalize and transfer exotic nuclei to high precision trap-based experiments and laser spectroscopy. The prototype of this CSC was recently successfully commissioned as the part of FRS Ion Catcher experiment at GSI. An areal density of ∼ 6.3 mg/cm² was reached while providing short extraction times (∼ 25 ms).

To meet the challenging requirements of the Super-FRS even higher areal densities are needed. Therefore, the design of a next-generation CSC has been developed based on the experience of advanced stopping cell techniques. The novel concept of CSC will provide 5 times higher areal densities increasing the stopping efficiency close to unity and increasing the rate capability by three orders of magnitude. At the same time the extraction time will be decreased down to 5 ms. Results of dedicated simulations and experiments will be presented.