Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 41: Poster: Electron scattering and recombination

A 41.3: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Absolute Recombination Rate Coefficients Of Highly Charged Tungsten Ions — •Kaija Spruck¹, Arno Becker², Dietrich Bernhardt¹, Manfred Grieser², Michael Hahn³, Claude Krantz², Michael Lestinsky⁴, Alfred Müller¹, Oldřich Novotný³, Roland Repnow², Daniel Wolf Savin³, Andreas Wolf², and Stefan Schippers¹ — ¹Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, 35392 Giessen, Germany — ²Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — ³Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027, USA — ⁴GSI Helmholtzzentrum, 64291 Darmstadt, Germany

Tungsten is commonly used as a material for plasma facing walls in nuclear fusion reactors as it can resist the typical high-temperatures and high neutron irradiation levels. As a result, impurities of highly charged tungsten ions in the plasma are inevitable. Radiation from these excited tungsten ions leads to plasma cooling. Modeling this cooling requires reliable ionization and recombination cross sections for tungsten ions. To date, most of the needed atomic data come from theory. Previously large discrepancies were found between experimental and theoretical values.

Here, we report electron-ion recombination experiments for highly charged tungsten ions, performed at the TSR storage ring in Heidelberg, Germany. Absolute experimental rate coefficients of W^q+ ions with 18 ≤ q ≤ 21 will be presented.