Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 6: Posters
MS 6.5: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Discharge ion source for systematic studies of a cryogenic stopping cell — •Florian Greiner1, Timo Dickel1,2, Hans Geissel1,2, Ivan Miskun3, Wolfgang Plass1,2, Moritz Pascal Reiter1, Ann-Kathrin Rink1, and Christoph Scheidenberger1,2 — 1JLU Giessen, Germany — 2GSI, Darmstadt, Germany — 3Tomsk Polytechnic University, Russia
At the FRS Ion Catcher facility ions are produced, selected and range-bunched in the FRS. In a gas-filled cryogenic stopping cell (CSC) the ions will be thermalized and extracted via a RF carped into an RF quadrupole and guided to further detectors.
An electrical discharge source was installed inside the CSC. The advantages of this source are a high current and a broad spectrum of ion masses (∼4 u to 250 u). Due to the high current it is possible to investigate space charge effects and the wide range of masses are necessary to proof the mass-dependent operation of the RF carpet.
Systematic studies for different mass-over-charge ratios can be done by filtering the mass of interest with the RFQ mass filter. In this case one mass region or one mass line was cut with the extraction RFQ in a mass-selectiv mode. Even in the high-pressure region of the RFQ, good mass filter performance was achieved. It was shown that the RF carpet can transport ions with masses down to 60 u and that doubly-charged ions can be extracted.
Systematic studies of the mass and intensity dependence of the RF carpet will be presented.