Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 46: Poster
HK 46.25: Poster
Donnerstag, 20. März 2014, 16:00–18:00, HZ Poster
Ion bunch stacking in a Penning trap after purification in an electrostatic ion-beam trap — •M. Rosenbusch for the ISOLTRAP collaboration — Ernst-Moritz-Arndt-Universität Greifswald
Measurements in analytical mass spectrometry as well as in precision mass determinations for atomic and nuclear physics are often handicapped when the ion sources deliver contaminations, i.e., unwanted ions of masses similar to those of the ions of interest. In particular, in ion-trapping devices, large amounts of contaminant ions result in significant systematic errors. At the Penning-trap mass spectrometer ISOLTRAP (ISOLDE/CERN), ions are purified in a multi-reflection time-of-flight mass separator (MR-ToF MS), which reaches a mass resolving power in excess of 105 in only tens of milliseconds [1,2]. However, the subsequent Penning-trap mass measurements require durations in order of a second. If only a certain maximum amount of ions can be processed simultaneously and the major parts are contaminants, the number of purified ions per mass-measurement cycle is limited. An improvement for such situations has been developed and realized recently [3]. The fast separation procedure of the MR-ToF MS is repeated several times while the purified ions are accumulated in a preparation Penning trap. In this contribution the method is described and proof-of-principle measurements are presented. [1] R. N. Wolf et al., Nucl. Instrum. Meth. A 686, 82 (2012); [2] R. N. Wolf et al., Int. J. Mass Spectrom. 349-350, 123 (2013); [3] M. Rosenbusch et al., Appl. Phys. B, accepted (2013), http://dx.doi.org/10.1007/s00340-013-5702-0