DIPAC2011 - List of Authors (Ensinger, W.)

Paper

Title

Page

Scintillation Screen Investigations for High Energy Heavy Ion Beams at GSI

170

P. Forck, C.A. Andre, F. Becker, R. Haseitl, A. Reiter, B. Walasek-Höhne
GSI, Darmstadt, Germany
W. Ensinger, K. Renuka
TU Darmstadt, Darmstadt, Germany

Funding: Funded by the German Ministry of Science (BMBF) under contract No. 06DA9026
Various scintillation screens were irradiated with high energy ion beams as extracted from the GSI synchrotron SIS18. Their imaging properties were studied with the goal to achieve a precise transverse profile determination. Scintillation images were characterized with respect to the light yield and statistical moments of the light distribution i.e. imaged beam width and shape. To study the scintillation properties over a wide range of intensities a 300 MeV/u Uranium ion beam with 10⁴ to 10⁹ particles per pulse was applied. Sensitive scintillators, namely CsI:Tl, YAG:Ce, P43 and Ce-doped glass were investigated for lower beam currents. Ceramics like Al₂O₃, Al₂O₃:Cr, ZrO₂:Y and ZrO₂:Mg as well as Herasil-glass were studied up to the maximum beam currents. For the various screens remarkable differences have been observed, e.g. the recorded profile width varies by nearly a factor of two. The obtained results serve as a basis for an appropriate choice of scintillator materials, which have to cope with the diversity of ion species and intensities at FAIR.

Poster MOPD53 [1.897 MB]

MOPD57

Quantitative Scintillation Screen Studies at GSI-LINAC and Related Model Calculations

179

E. Gütlich, P. Forck, B. Walasek-Höhne
GSI, Darmstadt, Germany
W. Ensinger
TU Darmstadt, Darmstadt, Germany

Scintillating screens are commonly used at accelerator facilities, however their imaging quality are not well understood, especially for high current ion beam operation. Several types of inorganic scintillators were investigated for various ion species and energies between 4.8 and 11.4 MeV/u. To validate the imaging quality of the scintillators a scraper scan method was established. For Al₂O₃ with a Ca beam of 4.8 and 11.4 MeV/u and a constant beam flux (ions/cm²/s), these methods are compared. For 4.8 MeV/u the results are in good agreement, while for 11.4 MeV/u the screen image does not reflect the beam distribution. A microscopic model is under development taking the properties of the fast electrons generated by the primary interaction into account. For Al₂O₃ this model can describe the observed saturation effect. Spectroscopic investigations were performed, to determine the influence of the ion beam intensity on the luminescence spectra emitted by the materials. No significant dependence on the spectrum with respect to the beam intensity was found for most of the scintillators.

Paper	Title	Page
MOPD53	Scintillation Screen Investigations for High Energy Heavy Ion Beams at GSI	170
	P. Forck, C.A. Andre, F. Becker, R. Haseitl, A. Reiter, B. Walasek-Höhne GSI, Darmstadt, Germany W. Ensinger, K. Renuka TU Darmstadt, Darmstadt, Germany
	Funding: Funded by the German Ministry of Science (BMBF) under contract No. 06DA9026 Various scintillation screens were irradiated with high energy ion beams as extracted from the GSI synchrotron SIS18. Their imaging properties were studied with the goal to achieve a precise transverse profile determination. Scintillation images were characterized with respect to the light yield and statistical moments of the light distribution i.e. imaged beam width and shape. To study the scintillation properties over a wide range of intensities a 300 MeV/u Uranium ion beam with 10⁴ to 10⁹ particles per pulse was applied. Sensitive scintillators, namely CsI:Tl, YAG:Ce, P43 and Ce-doped glass were investigated for lower beam currents. Ceramics like Al₂O₃, Al₂O₃:Cr, ZrO₂:Y and ZrO₂:Mg as well as Herasil-glass were studied up to the maximum beam currents. For the various screens remarkable differences have been observed, e.g. the recorded profile width varies by nearly a factor of two. The obtained results serve as a basis for an appropriate choice of scintillator materials, which have to cope with the diversity of ion species and intensities at FAIR.
	Poster MOPD53 [1.897 MB]

MOPD57	Quantitative Scintillation Screen Studies at GSI-LINAC and Related Model Calculations	179
	E. Gütlich, P. Forck, B. Walasek-Höhne GSI, Darmstadt, Germany W. Ensinger TU Darmstadt, Darmstadt, Germany
	Scintillating screens are commonly used at accelerator facilities, however their imaging quality are not well understood, especially for high current ion beam operation. Several types of inorganic scintillators were investigated for various ion species and energies between 4.8 and 11.4 MeV/u. To validate the imaging quality of the scintillators a scraper scan method was established. For Al₂O₃ with a Ca beam of 4.8 and 11.4 MeV/u and a constant beam flux (ions/cm²/s), these methods are compared. For 4.8 MeV/u the results are in good agreement, while for 11.4 MeV/u the screen image does not reflect the beam distribution. A microscopic model is under development taking the properties of the fast electrons generated by the primary interaction into account. For Al₂O₃ this model can describe the observed saturation effect. Spectroscopic investigations were performed, to determine the influence of the ion beam intensity on the luminescence spectra emitted by the materials. No significant dependence on the spectrum with respect to the beam intensity was found for most of the scintillators.