The Heidelberg EBIT: Present Results and Future Perspectives

Abstract

The Heidelberg electron beam ion trap (EBIT) is one of the three highenergy EBITs worldwide presently in operation. In this contribution, selected recent experimental results on precision spectroscopy measurements of trapped ions in the visible and x-ray wavelength regimes, respectively, will reviewed. Moreover, interference between radiative and dielectronic recombination pathways is demonstrated for Hg 75+...78+ ions and state selected electron transfer reactions in collisions of U 64+ with He is reported. Future perspectives with two new EBITs coming into operation in 2005 for the investigation of radioactive ions as well as the interaction of highly charged ions with intense photon beams from the free electron laser at DESY in Hamburg will be highlighted.

Stringent test of QED with hydrogen-like tin

“…Here we report on our high-precision g -factor measurement in hydrogen-like 118 Sn 49+ , reaching directly into the medium-to-high- Z range. To achieve this, we produce the hydrogen-like ions externally in the Heidelberg EBIT 8 , which can reach substantially higher charge states than the ion sources that were previously available for this type of measurement. From there, the ions are transported into the ALPHATRAP apparatus, in which we capture them to perform high-precision spectroscopy of the bound-electron g factor.…”

“…For the presented measurement, an enriched sample of Sn-118 was heated in an oven source for injection into the Heidelberg EBIT 8 . In the EBIT, a 200-mA electron beam focused by a 7-T magnetic field to a waist of a few tens of micrometres crosses the atomic beam in the centre electrode.…”

“…Here we report on our high-precision, high-field test of QED in hydrogen-like 118 Sn 49+ . The highly charged ions were produced with the Heidelberg electron beam ion trap (EBIT) 8 and injected into the ALPHATRAP Penning-trap setup 9 , in which the bound-electron g factor was measured with a precision of 0.5 parts per billion (ppb). For comparison, we present state-of-the-art theory calculations, which together test the underlying QED to about 0.012%, yielding a stringent test in the strong-field regime.…”

Atomic physics techniques for studying nuclear ground state properties, fundamental interactions and symmetries: status and perspectives

“…Charge breeding of ions for mass spectrometry is an integral part of the TITAN facility [116] soon coming into full operation. As reported in Poznan by Klaus Blaum and Christine Böhm, mass spectrometry of highly charged ions is also planned by coupling the so-called PENTATRAP to the Heidelberg electron beam ion trap (EBIT) [274]. This Penning trap mass spectrometer has five traps in a common superconducting solenoid for performing mass comparisons between two different ion species with very similar mass-overcharge ratios which are stored and simultaneously interrogated.…”

Ion transport through macrocapillaries – Oscillations due to charge patch formation

“…This charge state, which is manifest as a non-negligible potential energy of the ions, can be used to modify the surface/subsurface structure of materials in ways that are distinct from other forms of radiation [1][2][3][4][5][6]. Beams of M/HCIs are obtained from sources such as Electron Beam Ion Source/Traps (EBIS/Ts) and Electron Cyclotron Resonance (ECR) ion sources in laboratories worldwide [7][8][9][10][11][12][13][14] and most recently at our own user facility for surface modification [15] as well as medical physics [16]. Despite this access, a major hurdle in effectively harnessing the potential of these beams for industrial environments is efficient and flexible ion-transport technology.…”