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206701.0 [No comment] 20.01.2005 13:42 Released

ID: 206701.0, MPI für Kernphysik / Precision Spectroscopy and Ultracold Ensembles
Progress at the Heidelberg EBIT
Authors:Crespo López-Urrutia, J. R.; Braun, J.; Brenner, G.; Bruhns, H.; Dimopoulou, C.; Draganic, I. N.; Fischer, D.; González Martínez, A. J.; Lapierre, A.; Mironov, V.; Moshammer, R.; Soria Orts, R.; Tawara, H.; Trinczek, M.; Ullrich, J.
Publisher:Institute of Physics Publishing
Place of Publication:Bistol, UK
Date of Publication (YYYY-MM-DD):2004
Title of Proceedings:Ninth International Symposium on Electron Beam Ion Sources and Traps and Their Applications
Start Page:42
End Page:51
Title of Series:Journal of Physics: Conference Series
Volume (in Series):2
Name of Conference/Meeting:Ninth International Symposium of Electron Beam Ion Sources and Traps and Their Applications
Place of Conference/Meeting:Tokyo Metropolitan University, Japan
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Copyright:2004 IOP Publishing Ltd. and individual contributors.
Review Status:not specified
Audience:Experts Only
Abstract / Description:Two years after the relocation of the Heidelberg EBIT, several experiments are already in operation. Spectroscopic measurements in the optical region have delivered the most precise reported wavelengths for highly charged ions, in the case of the forbidden transitions of Ar XIV and Ar XV. The lifetimes of the metastable levels involved in those transitions has been determined with an error of less than 0.2%. A new, fully automatized x-ray crystal spectrometer allows systematic measurements with very high precision and reproducibility. Absolute measurements of the Lyman series of H-like ions are currently underway. Dielectronic recombination studies have yielded information on rare processes, as two-electron-one photon transitions in Ar16+, or the interference effects between dielectronic and radiative recombination in Hg77+. The apparatus can now operate at electron beam currents of more than 500 mA, and energies up to 100 keV. A further beam energy increase is planned in the near future. Ions can be extracted from the trap and transported to external experiments. Up to 4 × 107 Ar16+ ions per second can be delivered to a 1 cm diameter target at 10 m distance. Charge-exchange experiments with U64+ colliding with a cold He atomic beam have been carried out, as well as experiments aiming at the optimization of the charge state distribution of the extracted via dielectronic recombination. Two new EBITs, currently in advanced state of construction in Heidelberg, will be used for experiments at the VUV free electron laser at TESLA (Hamburg) and for the charge breeding of short-lived radioactive isotopes at the TRIUMF ISAC facility.
External Publication Status:published
Document Type:Conference-Paper
Affiliations:MPI für Kernphysik/Group J. Ullrich/Electron Beam Ion Trap ( J.R. Crespo Lopez-Urrutia)