Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 28: Poster: Interaction with VUV and X-ray light II

A 28.6: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

X-ray and gamma-ray polarimetry and imaging — •Stanislav Tashenov — Physikalisches Institut der Universität Heidelberg

To study fundamental atomic processes in the x-ray and gamma-ray regimes and to perform polarization diagnostics of laboratory fusion and astrophysical plasmas we develop a broad range of polarization sensitive and imaging x-ray and gamma-ray detectors. Two detectors are based on Silicon PIN diodes and Silicon Drift Detectors and dedicated to the energy range of 10--30 keV. This is the lowest energy range that was accessed by the Compton polarimetry. For the energy range of 30 keV -- 2 MeV we use a segmented planar germanium detector. It employs a novel technique of Pulse Shape Analysis of the detector signals for a 3D sensitivity to the positions of the x-ray interactions. With this detector we for the first time employed the techniques of Compton Imaging and background reduction in a laboratory physics experiment. It also achieved the polarization resolution of 0.3 deg which is the record for Compton polarimetry. To improve this further we develop a high resolution polarimeter that is based on a rotationally symmetric annular planar segmented germanium detector.