Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 27: Posters: Electron scattering and recombination

A 27.12: Poster

Donnerstag, 13. März 2008, 16:30–18:30, Poster C3

Dielectronic recombination of highly charged ions for optimization of charge breeding — •Lodewijk Arntzen, José R. Crespo López-Urrutia, Volkhard Mäckel, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, 69256 Heidelberg, Germany

The dielectronic recombination (DR) resonances for highly charged ions have been investigated through measurements of ions extracted from the Heidelberg electron beam ion trap (EBIT) while slowly scanning the electron energy. At strong DR resonances, the yield of the He-like krypton ions was substantially reduced, whereas that of the Li-like krypton ions was correspondingly increased. At slightly higher electron energies similar features were observed for the Li- and Be-like krypton ions. The DR process can be therefore used to modify significantly the ion charge state distribution, and by judicious choice of the excitation and recombination energies and timing, to concentrate the extracted ion current into particularly interesting charge states while depleting the undesired ones. This is particularly important for future charge breading experiments with short-lived radioactive isotopes, in order to improve the total charge breeding efficiency and to reduce the radioactive ion beam losses in the accelerator system. The convenient control of this parameters in an EBIT makes them well suited for this purpose.