Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Instrumentierung IV

HK 22.2: Vortrag

Dienstag, 16. März 2010, 14:30–14:45, HG IX

Status report on cryogenic stopping cell for the Low-Energy Branch of the Super-FRS at FAIR — •Sivaji Purushothaman1, Manisha Ranjan2, Peter Dendooven2, Wolfgang Plass1,3, and Christoph Scheidenberger1,31GSI, Darmstadt, Germany — 2KVI, University of Groningen, Netherlands — 3Justus Liebig University,Giessen, Germany

Low energy branch of the 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 Fragment Recoil Separator (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 are constructing a gas cell with a stopping volume of length 1 m and diameter 0.30 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. As high-density operation (up to 0.2 mg/cm3) is aimed for, we plan to push the limits of DC field and RF force. The way these goals are translated into the design will be shown. The status of the development of a cryogenic gas catcher for the Super-FRS at FAIR will be presented. Details of the mechanical and electronic design will be shown and the cooling and temperature control systems will be discussed.

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