Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.40: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
Detection system for forward emitted XUV photons from relativistic ion beams at the ESR — •C. Egelkamp1, V. Hannen1, Th. Kühl2,3,4, W. Nörtershäuser2,3, H.-W. Ortjohann1, R. Sánchez3, Th. Stöhlker3,4,5, J. Vollbrecht1, Ch. Weinheimer1, D. Winters3, and D. Winzen1 — 1Institut für Kernphysik, Uni Münster — 2Institut für Kernchemie, Uni Mainz — 3GSI, Darmstadt — 4Helmholtz Institut Jena — 5Uni Jena
Highly charged heavy ions stored at relativistic velocities provide a unique possibility to test atomic structure calculations. A possibility to investigate electron-electron correlations is the study of the 3P0 → 3P1 fine structure transition in Be-like Krypton (84Kr32+) in laser spectroscopy experiments. For this purpose Be-like krypton ions are stored in the experimental storage ring (ESR) at GSI at a velocity of β=0.69. Through an anticollinear arrangement of the excitation laser and the ions the wavelength in the rest frame of the ions can be matched. After the excitation to the 3P1 level the ions immediately decay to the ground state, emitting λ≈17 nm photons. Due to the Lorentz boost, the photons are emitted mainly in the forward direction and experience a Doppler shift to wavelengths <10 nm. To collect these photons a moveable cathode plate with a central slit is brought into the beam line. The XUV photons mostly produce low energy secondary electrons on the plate which are electromagnetically guided onto a MCP detector. The design and working principle, as well as simulations and test measurements of the detector will be presented. This work is supported by BMBF under contract number 05P15PMFAA.