Hamburg 2009 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Speicherringe, ICP-MS, Neue Entwicklungen

MS 8.2: Vortrag

Mittwoch, 4. März 2009, 14:15–14:30, VMP 8 R05

Investigation of the Isochronous Mode of the ESR — •Sergey Litvinov, Aleksey Dolinskii, H. Geissel, F. Nolden, M. Steck, and H. Weick — GSI, 64291, Darmstadt, Germany

The isochronous mode of a storage ring is a special ion-optical setting in which the revolution time of circulating ions of one species does not depend of their velocity spread. In this mode the ring can be used as a Time-Of-Flight (TOF) mass spectrometer.

Isochronous Mass Spectrometry (IMS) is an experimental technique for direct measurements of short-lived exotic nuclei which has been developed at the FRS-ESR facility at GSI.

A bottleneck for the present IMS experiments is the low transmission from the FRS to the ESR due to ion-optical mismatch between both systems. Besides transmission, dispersion mismatch negatively influences the isochronicity. For the first time, the ion-optical matching of the FRS-ESR in the isochronous mode has been calculated and experimentally verified. The experimental results and perspectives of further improvements will be presented.

Additionally, the influence of the transverse motion on the isochronicity has been studied and the corresponding calculation results will be shown. Possible improvements of the isochronous mode of the ESR will be outlined.