Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 59: Instrumentation XV
HK 59.5: Vortrag
Donnerstag, 31. März 2022, 15:15–15:30, HK-H4
The cryogenic stopping cell for the Super-FRS at FAIR: status and outlook — •Daler Amanbayev1, Samuel Ayet San Andres1, Timo Dickel1,2, Hans Geissel1,2, Wolfgang Plaß1,2, Christoph Scheidenberger1,2, the Super-FRS Experiment Collaboration2, and the FRS Ion Catcher Collaboration2 — 1II. Physikalisches Institut, Justus-Liebig-Universität Gießen, Gießen, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
The beams of exotic nuclei for the high-precision experiments planned at the Low-Energy Branch (LEB) of the Super-FRS at FAIR are produced at relativistic energies of up to 1.5 GeV/u, and have to be slowed down and thermalized down to a few eV. A gas-filled cryogenic stopping cell (CSC) is a key device in this process.
In order to achieve its challenging design performance parameters of areal densities of up to 40 mg/cm2 for stopping efficiencies of almost unity, fast ion extraction down to times of 10 ms and a rate capability of 107 ions per second, a novel two-stage orthogonal extraction concept has been developed. Detailed simulations of the CSC are verified and projected from the performance of the prototype CSC, which is being successfully used in online experiments as a part of the FRS Ion Catcher at GSI.
In this talk, the major components and processes of the CSC will be highlighted, such as fine-pitched radio-frequency carpet design, simulations of ion trajectories traversed by gas jets, a cryogen-free cooling system and an ultra-clean buffer gas recovery system.