Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 53: Poster – Instrumentation
HK 53.40: Poster
Donnerstag, 22. März 2012, 14:00–16:00, P Foyer
Scintillating screens for high current ion beam diagnostics — •Eiko Gütlich1 and Oliver Kester1,2 — 1Goethe Universität Frankfurt am Main, Deutschland — 2GSI, Darmstadt, Deutschland
Scintillating screens are commonly used at accelerator facilities, however their imaging qualities are not well understood, especially for high current ion beam operation. Several types of radiation-hard inorganic-materials were investigated for various ion species and energies of 4.8 and 11.4 MeV/u. Ceramic Al2O3 showed the best results compared to other ceramics like ZrO2 : Y or quartz glass Herasil 102. A model for the response to an ion beam has been developed. It is based on the radial dose distribution of the ions, estimations concerning the behavior in the overlapping regions and a maximal energy dose which can be converted inside the material, as proposed by Michaelian et al. This model was applied to Al2O3, can describe the observed saturation effect and is able to reconstruct saturated images. Detailed spectroscopic investigations were performed, to determine the influence of the ion beam intensity on the luminescence spectra emitted by the materials. Further more, the imaging properties of Al2O3 was investigated for different emission wavlenght. The F+-emission (340 nm) of the Al2O3 is more stable over time compared to the F0-emission (420 nm).