Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Instrumentierung V
HK 21.5: Vortrag
Dienstag, 22. März 2011, 15:15–15:30, HS2
Offline commissioning of a cryogenic stopping cell for the (Super-) FRS at GSI — •Sivaji Purushothaman1, Peter Dendooven2, Marcel Diwisch3, Hans Geissel1,3, Wolfgang Plass1,3, Manisha Ranjan2, Daniel Schaefer3, Christoph Scheidenberger1,3, and Timo Dickel3 — 1GSI, Darmstadt, Germany — 2KVI, University of Groningen, Netherlands — 3Justus-Liebig-Universität, Gießen, Germany
The low-energy branch of the Super Fragment Recoil Separator (Super-FRS) at FAIR in Darmstadt, Germany, will allow studies of radioactive isotopes using laser techniques and ion traps. For this purpose, we are developing an ion catcher that will stop high-energy ions from the Super-FRS in helium gas and extract them as a low-energy beam using DC and RF electric fields. The high purity of the helium gas will be ensured by operation at low temperature. We have constructed a gas cell with a stopping volume of length 1 m and diameter 0.25 m. To ensure fast and efficient extraction of the ions stopped throughout the volume of the cell we have opted for a DC field throughout the length of the cell and an RF carpet with DC field superimposed at the exit side to guide the ions towards the exit-hole without hitting the wall. We will present the results from the successful offline commissioning of the cryogenic stopping cell. Plans for online commissioning and use at the FRS will be discussed.