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Scintillation Screen Studies for High-Dose Ion Beam Applications

Gütlich, E. and Forck, P. and Ensinger, Wolfgang and Walasek-Hohne, B. (2012):
Scintillation Screen Studies for High-Dose Ion Beam Applications.
59, In: IEEE Transactions on Nuclear Science, (5), pp. 2354 -2359. IEEE Nuclear and Plasma Sciences Society, ISSN 0018-9499,
[Article]

Abstract

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 inorganic scintillators were investigated for various ion species and energies of 4.8 and 11.4 MeV/u. For ion beam applications, the exact reproduction of the beam profile is of great importance. Due to the impact by ions, the dose rate during beam delivery is more than 10 orders of magnitude higher as for other applications of scintillators in typical nuclear physics experiments. To validate the imaging quality of the scintillators, different profile measurement methods are compared. Ceramic Al2O3 showed the best results compared to other ceramics like ZrO2:Y or quartz glass Herasil 102. The imaging properties of the materials can depend significantly on the ion energy. For Al2O3 irradiated with a Ca beam the of 4.8 MeV/u, the results agree with the reference methods. However, for 11.4 MeV/u, the screen image does not reflect the beam distribution, which cannot be attributed to material degradation. A model is under development taking into account the radial dose distribution along the ion track as well as the overlap of tracks. For Al2O3, this model can describe the observed saturation effect and is able to reconstruct saturated images. The basics and applications of this model are discussed. Detailed spectroscopic investigations were performed to determine the influence of the ion - eam intensity on the luminescence spectra emitted by the materials. No significant dependence on the spectra with respect to the beam intensity was found for most of the scintillators.

Item Type: Article
Erschienen: 2012
Creators: Gütlich, E. and Forck, P. and Ensinger, Wolfgang and Walasek-Hohne, B.
Title: Scintillation Screen Studies for High-Dose Ion Beam Applications
Language: English
Abstract:

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 inorganic scintillators were investigated for various ion species and energies of 4.8 and 11.4 MeV/u. For ion beam applications, the exact reproduction of the beam profile is of great importance. Due to the impact by ions, the dose rate during beam delivery is more than 10 orders of magnitude higher as for other applications of scintillators in typical nuclear physics experiments. To validate the imaging quality of the scintillators, different profile measurement methods are compared. Ceramic Al2O3 showed the best results compared to other ceramics like ZrO2:Y or quartz glass Herasil 102. The imaging properties of the materials can depend significantly on the ion energy. For Al2O3 irradiated with a Ca beam the of 4.8 MeV/u, the results agree with the reference methods. However, for 11.4 MeV/u, the screen image does not reflect the beam distribution, which cannot be attributed to material degradation. A model is under development taking into account the radial dose distribution along the ion track as well as the overlap of tracks. For Al2O3, this model can describe the observed saturation effect and is able to reconstruct saturated images. The basics and applications of this model are discussed. Detailed spectroscopic investigations were performed to determine the influence of the ion - eam intensity on the luminescence spectra emitted by the materials. No significant dependence on the spectra with respect to the beam intensity was found for most of the scintillators.

Journal or Publication Title: IEEE Transactions on Nuclear Science
Volume: 59
Number: 5
Publisher: IEEE Nuclear and Plasma Sciences Society
Uncontrolled Keywords: Accelerator beam line instrumentation, ion accelerators, ion radiation effects, luminescent devices, particle beam instrumentation, radiation effects, scintillator devices, spectral analysis
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Date Deposited: 11 Oct 2012 11:14
Identification Number: doi:10.1109/TNS.2012.2191797
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