Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Instrumentierung V

HK 21.4: Vortrag

Dienstag, 22. März 2011, 15:00–15:15, HS2

First application of a multi-reflection time-of-flight mass separator to radioactive beams — •M. Rosenbusch — EMAU Greifswald

In most cases, radioactive ion beams are delivered only as a mixture of several isobaric species. This constitutes a major limitation for precision mass spectrometry of short-lived isotopes by use of Penning traps, since the presence of contaminant ions leads to frequency shifts. The state-of-the-art procedure to remove unwanted ions, mass-dependent ion centering by resonant excitation while applying buffer-gas cooling, takes several 100ms and works only for small ratios of "unwanted" to "wanted" ions. Thus, there is need for a cleaning method which not only conserves a high ion-of-interest throughput in the case of contamination, but also works on short time scales. An auxiliary device for isobaric purification of rare-isotope ensembles, in the form of a multi-reflection time-of-flight mass separator (MR-ToF MS), has recently been integrated into the Penning-trap mass spectrometer ISOLTRAP at the on-line isotope separator ISOLDE/CERN. An outline will be given of the MR-ToF-MS and the modifications of ISOLTRAP components that were required for the implementation. In addition, the performance of the combined setup both in off-line tests as well as in the context of the first applications during on-line beamtimes will be described.