Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Poster - Instrumentation I
HK 52.19: Poster
Wednesday, March 6, 2013, 16:45–19:00, HSZ 2.OG
Detection systems for forward emitted XUV photons from relativistic ion beams at the ESR — Ch. Geppert2,3, V. Hannen1, R. Jöhren1, Th. Kühl2,3,4, W. Nörtershäuser2,3, H.-W. Ortjohann1, R. Sánchez3, Th. Stöhlker3,4,5, •J. Vollbrecht1, Ch. Weinheimer1, and D. Winters3 — 1Institut für Kernphysik, Uni Münster — 2Institut für Kernchemie, Uni Mainz — 3GSI, Darmstadt — 4Helmholtz Institut Jena — 5Uni Jena
Laser spectroscopy experiments with stored relativistic heavy ions can test atomic structure calculations by exploiting the large Doppler "boost" of the transitions. However, this "boost" also strongly shifts the fluorescence from the ions, and directs it into a narrow forward cone (searchlight). This renders the need for a moveable detection system, which collects the light around the ion beam in vacuo. We would now like to study effects of electron-electron correlations in Be-like krypton (84Kr32+) via a laser spectroscopic measurement of the 3P1−3P0 transition. Based on the successful design for a previous ESR experiment, a new detection system for forward emitted XUV photons will be constructed. The Krypton ions are stored at high velocities (β≈ 0.69) in the ESR, therefore the wavelength for de-excitation to the ground state is Doppler shifted from λ0≈17 nm to λ≈9 nm. When these photons hit a metal collector they will produce secondary electrons at low energies (≈ 3 eV). The electrons will be electrostatically guided onto a MCP detector. The underlying principles as well as the current design of the XUV detection system will be presented on this poster. This work is supported by BMBF under contract number 06MS7191.