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MS: Massenspektrometrie
MS 5: Präzisions-MS kurzlebiger Nuklide 1
MS 5.6: Vortrag
Mittwoch, 15. März 2006, 15:30–15:45, H1
Non-destructive detection of image currents for high-accuracy mass measurements of short-lived nuclides — •Jens Ketelaer1, Klaus Blaum1,2, Michael Block2, Rafael Ferrer1, Stefan Stahl3, Christine Weber1,2, and the SHIPTRAP collaboration2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — 2GSI Darmstadt, 64291 Darmstadt, Germany — 3Stahl-Electronics, 67582 Mettenheim, Germany
To perform high-accuracy mass measurements on some rarely produced nuclides heavier than uranium, ions of the species will be stored in a Penning trap. While moving in the trap, the ions induce an image current e.g. in the segmented ring electrode. The frequency is directly related to the charge-to-mass ratio of the nuclide of interest.
For SHIPTRAP, a new cryogenic Penning trap setup has been built [1]. This consists of a cylindrical purification trap, a hyperbolically shaped measurement trap - both at 77 K - and a superconducting coil at 4 K.
The coil and parasitary capacitances form a resonance circuit, which has to match the frequency of the ion motion. This technique is needed to determine the weak image current induced by a singly charged ion.
First tests of the characteristics of the superconducting coil and the attached electronics will be done in an off-line setup, providing similar conditions as far as temperature and pressure are concerned. The current status will be presented.
[1] C. Weber et al., Eur. Phys. J. A 25, S01, 65 (2005)