Hamburg 2009 – scientific programme

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A: Fachverband Atomphysik

A 5: Atomic Systems in External Fields I

A 5.3: Talk

Monday, March 2, 2009, 17:15–17:30, VMP 6 HS-B

Charge breeding in SPARC EBIT — Sabrina Geyer¹, Frank Herfurth¹, Oliver Kester¹, Wolfgang Quint¹, Alexandra Silze², •Alexey Sokolov¹, Thomas Stoehlker¹, and Gleb Vorobjev¹ — ¹GSI, Darmstadt, Germany — ²Institut für Angewandte Physik, Technische Universität Dresden, Germany

Charge breeding experiments are important to increase the variety of elements produced in highly charged ion state by electron beam ion sources/traps (EBIS/T). In our experiment, singly charged ions, created by an external high temperature substrate heater were injected into an EBIT for further ionization. Continuing recent studies using MAXEBIS, charge breeding experiments were performed this time with the new SPARC EBIT. The advantages of this source are it's compact size and application of permanent magnets instead of superconducting coils. In it's low magnetic field of 0.25T on the electron beam axis the singly charged ions could only be trapped due to the electrostatic fields of the drift tube electrodes and the space charge potential of the electrons. The influence of the electron beam potential on the ion confinement was studied in simulations showing an effective potential well of approximately 30 eV (dependent on electron current and energy) and, thus, a good possibility for trapping. Charged species produced in the EBIT were analysed using X-rays spectroscopy and m/q separation techniques. Experimental results showed that the capture is in fact difficult. The absence of magnetic trapping as well as the small trap region of the source are the main reasons for that. Further attempts are currently in preparation using an advanced setup.