Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Instrumentation 18

HK 60.3: Vortrag

Donnerstag, 26. März 2015, 18:00–18:15, M/HS2

Investigations of space charge effects in the cryogenic gas filled stopping cell for the FRS Ion Catcher — •Fabian Heisse^1,3, Timo Dickel^2,3, Wolfgang Plass^2,3, Moritz Pascal Reiter², Ann-Kathrin Rink², Hans Geissel^2,3, Christoph Scheidenberger^2,3, and Kai Zuber¹ for the FRS Ion Catcher collaboration — ¹IKTP TU Dresden — ²II. Physikalisches Institut JLU Giessen — ³GSI Helmholtzzentrum für Schwerionenforschung

At the FRS Ion Catcher experiment precision mass measurements of short lived projectile and fission fragments are performed. Therefore highly charged ions with relativistic energies need to be thermalized to kinetic energies of several eV. This process takes place in the cryogenic gas filled stopping cell (CSC). All stopping cells suffer at large ion rates under space charge effects, which lead to decreasing efficiencies and can also influence the extraction time.

Thus the understanding of space charge effects is of greatest importance to make full use of the higher yields at future rare ion beam facilities like FAIR. For this purpose simulation with the software SIMION® concerning space charge effects were done.

In this presentation the calculated transport efficiency of the CSC for different intensities, electric fields and spill structures are discussed and compared with measured results. Furthermore an outlook and first results of the simulation for the new CSC for the Low-Energy Branch at FAIR will be given.