Spatial characterization of the internal gas target at the ESR for the FOCAL experiment. (26th November 2015)

• Record Type: Journal Article
• Authors: T Gassner, ; Beyer, H F
• Is Part Of: Physica scripta. Volume T166(2015:Nov.)
• Publication Date: 2015-11-26
• Subjects: gas target characterization -- Lamb-shift -- highly charged ions; Physics -- Periodicals; 530.05
• DOI: 10.1088/0031-8949/2015/T166/014052
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: The FOCAL experiment involves a highly accurate twin crystal spectrometer, designed for the measurement of the ground state Lamb shift of stored highly charged ions, like hydrogen-like Au 78+, via spectroscopy in the hard-x-ray regime with an accuracy down to the few-eV level where higher-order QED contributions become accessible. For this level of accuracy all geometrical parameters including the position of the x-ray source are of crucial importance. In this conference proceeding we present our efforts to characterize the internal gas target at the experiment storage ring at GSI Darmstadt where in 2012 the FOCAL experiment was conducted.