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EP: Fachverband Extraterrestrische Physik

EP 4: Poster Session

EP 4.42: Poster

Tuesday, February 26, 2013, 11:15–12:45, Poster OG

Scintillation quenching in BGO crystal of the Solar Orbiter HET — •J. Grunau, S.R. Kulkarni, C. Martin, S. Boettcher, L. Seimetz, B. Schuster, A. Kulemzin, and R.F. Wimmer-Schweingruber — IEAP, Christian-Albrechts-Universität zu Kiel, Germany

The High-Energy Telescope (HET) on ESA's Solar Orbiter mission will measure electrons from 300 keV up to about 30 MeV, protons from 10 to 100 MeV and heavy ions from approximately 20 to 200 MeV/nuc. These measurement capabilities are reached by a combination of solid-state tracking detectors and a scintillator calorimeter. This setup can perform particle identification via the dE/dx vs total E technique. The scintillator approach provides a good resolution over the complete energy range but the total energy deposition has to be corrected for the scintillation quenching. The quenching lowers light output depending on the type and energy of the incident particle. We measured the crystal response for different heavy ions and energies and compared them to simulated values. Simulations were carried out using the GEANT4 toolkit provided by CERN. From comparison of simulated and measured data we were able to calculate quenching factors for the BGO crystals for ions up to iron. The results are of great interest for later data analysis with the HET telescope.