Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 22: Poster

T 22.4: Poster

Montag, 19. März 2018, 16:00–18:30, Z6 - Foyer

GEANT 4 simulation of the Kiel Electron Telescope on board Ulysses — •M. Köberle, B. Heber, P. Kühl, and J. Marquardt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany

Ulysses was the first mission to explore the space environment above the poles of the sun. The mission launched in 1990, made three "fast latitude scans" of the Sun in 1994/1995, 2000/2001, and 2007/2008 providing a wealth of data. The COsmic and Solar Particle INvestigation Kiel Electron Telescope (COSPIN/KET) measures protons and alpha-particles in the energy range from about 4 to above 2000 MeV/n and electrons in the range from 2 to above 300 MeV in distinguished energy channels. The telescope consists of two parts: an entrance telescope of two semiconductors comprising a silica-aerogel Cherenkov detector with a refractive index of 1.066, selecting particles with speeds v/c = b > 0.938, which also determines the magnitude of the particle charge. Secondly the calorimeter, a lead-fluoride Cherenkov detector followed by a scintillation detector measuring escaping particles. In order to describe the instrument response function we setup a GEANT 4 model and validated it against calibration measurements performed prior to the launch of the spacecraft. Here we present the model and the corresponding calculations that are in excellent agreement with measurements obtained at different accelerators.