U. Kentsch

Production of bare argon, manganese, iron and nickel nuclei in the Dresden EBIT

Abstract The production of highly charged argon, manganese, iron and nickel ions in a room-temperature electron beam ion trap (EBIT), the Dresden EBIT, has been investigated by means of energy dispersive X-ray spectroscopy of the direct excitation (DE) and radiative recombination (RR) processes. To derive the charge state distributions of the ions in the trap, direct excitation and radiative recombination cross-sections were calculated at electron energies of 8 and 14.4 keV. Based on these theoretical cross-sections and the measured X-ray spectra, the ion densities and the absolute number of ions, which are trapped in the electron beam, are determined for argon, manganese, iron and nickel. Emphasis has been paid to the highly charged ions, including the helium-like and hydrogen-like ions and bare nuclei. In the case of iron we also determined the contributions from lower ionization stages from DE transition lines. It is shown, that in the Dresden EBIT elements at least up to nickel can be fully ionized. Beside energy dispersive spectroscopy it is shown for iron by wavelength dispersive X-ray spectroscopy that with a comparably high gas pressure in the order of 10−8 mbar carbon-, boron-, beryllium-, lithium- and helium-like iron ions can be produced.

X-ray spectroscopy and ion extraction at the Dresden EBIT

Abstract The Dresden electron beam ion trap (EBIT) is a compact, long-term stable room-temperature EBIT able to produce bare nuclei for elements up to about Z =30 and helium-like to neon-like ions for heavier elements, respectively. With ion species ranging from Ir 57+ up to Ir 62+ and Ce 48+ we demonstrate the applicability of the ion source for energy and wavelength-dispersive X-ray spectroscopy. First ion extraction experiments show that it is possible to extract ion currents of 10 6 ions per pulse at various pulse repetition rates, measured electrically for xenon ion pulses with a mean ion charge of Xe 40+ and a pulse FWHM of 15 μs. Additionally, first X-ray spectra from the interaction of extracted xenon ions with a carbon target are presented.

Report on the current developments and experiments of the Dresden EBIT System

The developmental direction of the Dresden EBIT system is being supplemented by a new model, the Dresden EBISA. A short review of the development history and an outline of the status will be given. Recent measurements of time-resolved and energy-dispersive X-ray spectroscopy are presented with focus on the dielectronic recombination resonances of krypton.