Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 16: XUV/X-ray spectroscopy III
A 16.5: Vortrag
Dienstag, 7. März 2017, 15:45–16:00, N 2
High-precision X-ray spectroscopy of highly-charged ions at storage rings using silicon microcalorimeters — •Pascal Andree Scholz1, Victor Andrianov2, Artur Echler3,4, Peter Egelhof3,4, Oleg Kiselev3, Saskia Kraft-Bermuth1, and Damian Muell1 — 1Justus-Liebig-Universität, Giessen, Germany — 2Lomonosov Moscow State University, Moscow, Russia — 3GSI Helmholtz Center, Darmstadt, Germany — 4Johannes-Gutenberg Universität, Mainz, Germany
High-precision X-ray spectroscopy of highly-charged heavy ions provides a sensitive test of quantum electrodynamics in very strong Coulomb fields. Silicon microcalorimeters, which detect the X-ray energy as heat rather than by charge production, have already demonstrated their potential to improve the precision of such experiments due to their excellent energy resolution for X-ray energies around 100 keV. Microcalorimeter arrays based on silicon thermistors and tin absorbers have already been successfully applied at the Experimental Storage Ring (ESR) of the GSI Helmholtz Center for Heavy Ion Research. Based on these experiments, a larger detector array with three times the active detector area in a new cryogen-free cryostat equipped with a pulse tube cooler is currently in preparation. Recently, a new compact detector design was applied in a test experiment at the ESR. In this presentation, we will introduce the detection principle, present the ESR test experiment following results, and discuss potential future applications.