Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 69: Instrumentation
HK 69.4: Vortrag
Donnerstag, 7. März 2013, 15:00–15:15, WIL-A221
Scintillating screens for intense heavy ion beams — •Eiko Gütlich1, Peter Forck2, Wolfgang Ensinger3, and Oliver Kester1,2 — 1Goethe-Universität Frankfurt, Institut für Angewandte Physik — 2GSI Helmholtzzentrum für Schwerionenforschung — 3Technische Universität Darmstadt, Materialwissenschaften
Beam diagnostics is a fundamental part of every particle accelerator. In contrast to other methods, scintillating screens are a very cost efficient and simple method to determine the transversal beam properties. They are used for the qualitative beam alignment as well as for optimization of the beam intensity distribution in nearly all accelerators. To perform quantitative measurements with scintillating screens the imaging properties, aging and dynamical behaviour have to be known. Thus, extensive investigations have been carried at the GSI linear accelerator UNILAC. Due to the energy deposition of heavy ions with kinetic energy of 11.4 MeV/u, the resulting dose rates for the materials are up to 1012 Gy/h. The high dose rates and heat loads limit the potential screen materials to radiation hard materials like ceramic Al2O3 or ZrO2. The measurements show that the imaging quality can depend on the materials itself, its temperature, the accumulated fluence [ions/cm2], the flux [ions/(cm2*s)], the ion energy as well as the observed emission wavelength. For Al2O3 a model has been developed to explain the observed saturation effects. To validate the model, experiments with a known ion beam distribution and flux have been carried out. For Carbon and Titanium ions with kinetic energy of 11.4 MeV/u the flux and the pulse length have been varied.