Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Instrumentation

HK 64.4: Vortrag

Freitag, 23. März 2012, 15:00–15:15, P 2

Detection systems for forward emitted fluorescence photons from relativistic ion beams at storage rings — D. Anielski¹, Ch. Geppert^2,3, V. Hannen¹, R. Jöhren¹, T. Kühl³, M. Lochmann^2,3, R. Lopéz Coto¹, •J. Mader¹, W. Nörtershäuser^2,3, H.-W. Ortjohann¹, R. Sánchez³, Ch. Weinheimer¹, and D. Winters³ — ¹Institut für Kernphysik, Universität Münster — ²Institut für Kernchemie, Universität Mainz — ³GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

Laser spectroscopy experiments with highly charged ions (HCI) enable very precise tests of QED in extremly strong electromagnetic fields by comparing hyperfine transitions in H- and Li-like heavy ions of the same isotope. In ²⁰⁹Bi⁸⁰⁺ the transition wavelength lies in a challenging infrared region, i.e. λ₀ ≈ 1555 nm. When the ions are stored at high velocities (β≈0.71) at the ESR at GSI the wavelength of forward emitted photons is Doppler shifted to λ ≈ 640 nm which makes them detectable with standard PMTs. The difficulty is to efficiently collect those photons without disturbing the ion beam. For this purpose, a movable parabolic mirror system with a central slit for the beam has been developed at the university of Münster and will be presented in this talk. The system has been used in the successful measurement of the hyperfine transition in Li-like Bismuth during the LIBELLE experiment. Based on this experience a detection system for forward emitted photons at XUV wavelength will be constructed and used in fine structure measurements with Be-like Krypton at ESR.
This work is supported by BMBF under contract number 06MS9152I.