Berlin 2005 – scientific programme

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MS: Massenspektrometrie

MS 2: Posterbeiträge

MS 2.9: Poster

Friday, March 4, 2005, 11:45–12:30, Poster HU

A High-Current EBIT for Charge-Breeding of Radionuclides for the TITAN Penning Trap Mass Spectrometer — •Günther Sikler — MPI für Kernphysik

The TITAN Penning trap mass spectrometer is designed for making high-precision mass measurements on radionuclides by determining the cyclotron frequency of the ions confined within the Penning trap. The cyclotron frequency, ν depends not only upon the mass of the ion but also upon the magnetic field of the trap and the charge-state of the ions; ν = Bq/m. For a given accuracy in the frequency determination, Δ ν , which depends principally upon the duration of the measurement; the relative accuracy of the mass measurement can be increased by preparing the ions of interest in a higher charge-state. Also, as a consequence of the ions being in high charge-states, a desired accuracy can be attained within a shorter measurement interval. This is an important issue for high-accuracy mass measurements on rare isotopes with nuclear half-lives significantly shorter than 1 second.

In order to rapidly charge-breed the ions to any charge-state (including fully stripped systems) an EBIT (Electron Beam Ion Trap) is a well-suited device. A high-current electron beam from an electron gun is compressed by means of a strong magnetic field and collected behind the magnet. The space charge field of the electrons traps the ions while they are continuously charge-bred due to the impact of the electrons. An EBIT is currently under construction by the Heidelberg EBIT group, in collaboration with TITAN. A report on the status of the project and results of first tests will be given.